text4shell-scan

A fully automated, accurate, and extensive scanner for finding vulnerable text4shell hosts

Features

• Support for lists of URLs.
• Fuzzing for more than 60 HTTP request headers.
• Fuzzing for HTTP POST Data parameters.
• Fuzzing for JSON data parameters.
• Supports DNS callback for vulnerability discovery and validation.
• WAF Bypass payloads.
• Support for custom DNS OOB callbacks (ex: Burpsuite Collaborator)

Description

Heavily based off Fullhunts old Log4j scanner from 2021 (MAJOR CREDIT TO THEM), this scanning tool is used now for discovering and fuzzing for Text4Shell RCE CVE-2022-42889. This shall be used by security teams to scan their infrastructure for Text4Shell RCE, and also test for WAF bypasses that can result in achieving code execution on the organization's environment.

It supports DNS OOB callbacks out of the box, there is no need to set up a DNS callback server. Note interact.sh been slow so it is not recommended to use at this time.

https://nvd.nist.gov/vuln/detail/CVE-2022-42889

Usage

$ python3 text4shell-scan.py -h
[•] CVE-2022-42889 - Apache Commons Text RCE Scanner
[•] Scanner provided by @securekomodo

usage: text4shell-scan.py [-h] [-u URL] [-p PROXY] [-l USEDLIST] [--request-type REQUEST_TYPE] [--headers-file HEADERS_FILE] [--run-all-tests] [--exclude-user-agent-fuzzing]
                     [--wait-time WAIT_TIME] [--waf-bypass] [--custom-waf-bypass-payload CUSTOM_WAF_BYPASS_PAYLOAD]
                     [--dns-callback-provider DNS_CALLBACK_PROVIDER] [--custom-dns-callback-host CUSTOM_DNS_CALLBACK_HOST] [--disable-http-redirects]

optional arguments:
  -h, --help            show this help message and exit
  -u URL, --url URL     Check a single URL.
  -p PROXY, --proxy PROXY
                        send requests through proxy
  -l USEDLIST, --list USEDLIST
                        Check a list of URLs.
  --request-type REQUEST_TYPE
                        Request Type: (get, post) - [Default: get].
  --headers-file HEADERS_FILE
                        Headers fuzzing list - [default: headers.txt].
  --run-all-tests       Run all available tests on each URL.
  --exclude-user-agent-fuzzing
                        Exclude User-Agent header from fuzzing - useful to bypass weak checks on User-Agents.
  --wait-time WAIT_TIME
                        Wait time after all URLs are processed (in seconds) - [Default: 5].
  --waf-bypass          Extend scans with WAF bypass payloads.
  --custom-waf-bypass-payload CUSTOM_WAF_BYPASS_PAYLOAD
                        Test with custom WAF bypass payload.
  --dns-callback-provider DNS_CALLBACK_PROVIDER
                        DNS Callback provider (Options: dnslog.cn, interact.sh) - [Default: interact.sh].
  --custom-dns-callback-host CUSTOM_DNS_CALLBACK_HOST
                        Custom DNS Callback Host.
  --disable-http-redirects
                        Disable HTTP redirects. Note: HTTP redirects are useful as it allows the payloads to have a higher chance of reaching vulnerable systems.

Scan a Single URL

$ python3 text4shell-scan.py -u https://<enter URL here>

Scan a Single URL using all Request Methods: GET, POST (url-encoded form), POST (JSON body)

$ python3 text4shell-scan.py -u https://<enter URL here> --run-all-tests

Discover WAF bypasses against the environment.

$ python3 text4shell-scan.py -u https://<enter URL here> --waf-bypass

Scan a Single URL using Burpsuite Collaborator

$ python3 text4shell-scan.py -u https://<enter URL here> --custom-dns-callback-host <copy collaborator host here>

Scan a list of URLs

$ python3 text4shell-scan.py -l urls.txt

Installation

$ pip3 install -r requirements.txt

Docker Support

git clone [https://github.com/securekomodo/text4shell-scan.git](https://github.com/securekomodo/text4shell-scan.git)
cd text4shell-scan
sudo docker build -t text4shell-scan .
sudo docker run -it --rm text4shell-scan

# With URL list "urls.txt" in current directory
docker run -it --rm -v $PWD:/data text4shell-Scan -l /data/urls.txt

TODO

• Implement a param miner to more intelligently inject payloads into. Currently GET requests are simply ?v=<payload>
• Add URL encoding of varying degrees to not only bypass WAF, but to avoid HTTP Error 400 for bad chars
• Add new exploit payloads and their WAF bypasses (currently only checking DNS interaction)

${script:js:java.lang.Runtime.getRuntime().exec("do something here")} - Not Yet Implemented
${url:URL} - Not Yet Implemented
${env:PATH} - Maybe
${dns:DNSNAME} - Complete

Legal Disclaimer

This project is made for educational and ethical testing purposes only. Usage of text4shell-scan for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state and federal laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program.

License

The project is licensed under MIT License.

Author

Bryan Smith

• Twitter: https://twitter.com/securekomodo