log4j-scan

A fully automated, accurate, and extensive scanner for finding vulnerable log4j hosts

Features

• Support for lists of URLs.
• Fuzzing for more than 60 HTTP request headers (not only 3-4 headers as previously seen tools).
• Fuzzing for HTTP POST Data parameters.
• Fuzzing for JSON data parameters.
• Supports DNS callback for vulnerability discovery and validation.
• Supports TCP callback for vulnerability discovery and validation on corporate network (requires TCP receveir).
• Supports preemptive basic authentication or authorization header injection (basic type)
• WAF Bypass payloads.

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🚨 Announcement

There is a patch bypass on Log4J v2.15.0 that allows a full RCE. FullHunt added community support for log4j-scan to reliably detect CVE-2021-45046. If you're having difficulty discovering and scanning your infrastructure at scale or keeping up with the Log4J threat, please get in touch at ([email protected]).

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Description

We have been researching the Log4J RCE (CVE-2021-44228) since it was released, and we worked in preventing this vulnerability with our customers. We are open-sourcing an open detection and scanning tool for discovering and fuzzing for Log4J RCE CVE-2021-44228 vulnerability. This shall be used by security teams to scan their infrastructure for Log4J 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.

Usage

$ python3 log4j-scan.py -h
[•] CVE-2021-44228 - Apache Log4j RCE Scanner
[•] Scanner provided by FullHunt.io - The Next-Gen Attack Surface Management Platform.
[•] Secure your External Attack Surface with FullHunt.io.
usage: log4j-scan.py [-h] [-u URL] [-l USEDLIST] [-p PROXY] [--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] [--test-CVE-2021-45046]
                     [--dns-callback-provider DNS_CALLBACK_PROVIDER] [--custom-dns-callback-host CUSTOM_DNS_CALLBACK_HOST] [--custom-tcp-callback-host CUSTOM_TCP_CALLBACK_HOST]
                     [--basic-auth-user USER] [--basic-auth-password PASSWORD] [--authorization-injection INJECTION_TYPE] [--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.
  --test-CVE-2021-45046
                        Test using payloads for CVE-2021-45046 (detection payloads).
  --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.
  --custom-tcp-callback-host CUSTOM_TCP_CALLBACK_HOST
                        Custom TCP Callback Host.
  --basic-auth-user USER
                        Preemptive basic authentication user.
  --basic-auth-password PASSWORD
                        Preemptive basic authentication password.
  --authorization-injection INJECTION_TYPE
                        Authorization injection type: (basic) - [Default: none].
  --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 log4j-scan.py -u https://log4j.lab.secbot.local

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

$ python3 log4j-scan.py -u https://log4j.lab.secbot.local --run-all-tests

Discover WAF bypasses against the environment.

$ python3 log4j-scan.py -u https://log4j.lab.secbot.local --waf-bypass

Scan a list of URLs

$ python3 log4j-scan.py -l urls.txt

Scan an URL using a custom TCP receiver

In a corporate network, using external DNS could/should be forbidden, and install a dedicated corporate DNS for this scanner usage could be not trivial.

A way could be to use a running simple TCP receiver which logs vulnerable IPs.

$ python3 log4j-scan.py -u https://log4j.lab.secbot.local --custom-tcp-callback-host 10.42.42.42:80

Installation

$ pip3 install -r requirements.txt

Docker Support

git clone https://github.com/fullhunt/log4j-scan.git
cd log4j-scan
sudo docker build -t log4j-scan .
sudo docker run -it --rm log4j-scan

# With URL list "urls.txt" in current directory
docker run -it --rm -v $PWD:/data log4j-scan -l /data/urls.txt

Unit tests execution

pytest framework is used:

virtualenv ~/tmp/venv-log4j-scan
source ~/tmp/venv-log4j-scan/bin/activate
pip install -r requirements.txt
pip install -r tests/requirements.txt
    
# Execute all unit tests 
pytest
    
# Way to execute one unit test method
pytest -k "default"
pytest tests/test_log4j_scan.py::test_default

NB: Could only be executed on Linux, termios pip module can't be installed on Windows.

About FullHunt

FullHunt is the next-generation attack surface management platform. FullHunt enables companies to discover all of their attack surfaces, monitor them for exposure, and continuously scan them for the latest security vulnerabilities. All, in a single platform, and more.

FullHunt provides an enterprise platform for organizations. The FullHunt Enterprise Platform provides extended scanning and capabilities for customers. FullHunt Enterprise platform allows organizations to closely monitor their external attack surface, and get detailed alerts about every single change that happens. Organizations around the world use the FullHunt Enterprise Platform to solve their continuous security and external attack surface security challenges.

Legal Disclaimer

This project is made for educational and ethical testing purposes only. Usage of log4j-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

Mazin Ahmed

• Email: mazin at FullHunt.io
• FullHunt: https://fullhunt.io
• Website: https://mazinahmed.net
• Twitter: https://twitter.com/mazen160
• Linkedin: http://linkedin.com/in/infosecmazinahmed