CVE-2021-41773 PoC — Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49

Source

https://github.com/Hydragyrum/CVE-2021-41773-Playground

Associated Vulnerability

Title:Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 (CVE-2021-41773)
Description:A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

Description

Some docker images to play with CVE-2021-41773 and CVE-2021-42013

Readme

# CVE-2021-41773-Playground
Some docker images to play with CVE-2021-41773 and CVE-2021-42013

run `docker compose up -d` to spin up all the containers.

Servers will run on ports 8080, 8081, 8082, and 8083.

- 8080 contains an Apache 2.4.49 with CGI disabled.
- 8081 contains an Apache 2.4.49 with CGI enabled.
- 8082 contains an Apache 2.4.50 with CGI disabled.
- 8083 contains an Apache 2.4.50 with CGI enabled.

There are some flags on each server at /flag.txt See if you can grab them :)

There is a special flag hidden on the server on 8083 which requires a reverse shell (in principle)

File Snapshot

Remarks

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