Vulnerability identifier: #VU4383

Vulnerability risk: Critical

CVSSv3.1: 9.3 [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]

CVE-ID: CVE-2013-4211

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Revive Adserver
Web applications / Other software

Vendor: OpenX Source

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.

Mitigation
Update to version 2.8.11 or later.

Vulnerable software versions

Revive Adserver: 2.8.10 - 2.8.11

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External links
http://seclists.org/oss-sec/2013/q3/295

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.