- 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.
- WAF Bypass payloads.
FullHunt released an update to identify Apache Commons Text RCE (CVE-2022-42889). Apache Commons Text RCE is highly similar to Log4J RCE, and we recommend patching it as soon as possible. Vulnerable applications allow full remote-code execution. If help is needed in scanning and discovering this vulnerability on your infrastructure, please get in touch at (team@fullhunt.io).
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 (team@fullhunt.io).
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.
$ python3 log4j-scan.py -h
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] [-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] [--test-CVE-2021-45046] [--test-CVE-2022-42889]
[--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.
--test-CVE-2021-45046
Test using payloads for CVE-2021-45046 (detection payloads).
--test-CVE-2022-42889
Test using payloads for Apache Commons Text RCE (CVE-2022-42889).
--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.$ python3 log4j-scan.py -u https://log4j.lab.secbot.local$ python3 log4j-scan.py -u https://log4j.lab.secbot.local --run-all-tests$ python3 log4j-scan.py -u https://log4j.lab.secbot.local --waf-bypass$ python3 log4j-scan.py -l urls.txt$ pip3 install -r requirements.txt
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.txtFullHunt 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.
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.
The project is licensed under MIT License.
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