Zero-day vulnerability in Revive Adserver

Arbitrary PHP code execution
CVE-2013-4211

The vulnerability has been exploited from November 2012 till August 2013.

Vulnerability details

Advisory: SB2013080601 - PHP code execution in OpenX Revive Adserver

Vulnerable component: Revive Adserver

CVE-ID: CVE-2013-4211

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Description:

The vulnerability allows a remote attacker to execute arbitrary PHP code on the target system.

The weakness exists due to compromise of the source code package. A remote attacker can create a specially crafted request with a rot13'd and reversed payload and send it to the target system to execute arbitrary PHP code.

Successful exploitation of the vulnerability results in arbitrary PHP code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Public Exploits:

- OpenX - Backdoor PHP Code Execution (Metasploit) [Exploit-DB]

External links:

https://www.tripwire.com/state-of-security/vulnerability-management/analyzing-cve-2013-4211-openx-ad...
https://www.rapid7.com/db/modules/exploit/multi/http/openx_backdoor_php

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.