Zero-day vulnerability in Mt-phpincgi

Arbitrary PHP code execution
CVE-2015-2945

Vulnerability details

Advisory: SB2015051501 - PHP code execution in H-fj Mt-phpincgi

Vulnerable component: Mt-phpincgi

CVE-ID: CVE-2015-2945

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 improper validation of input when performing an unserialize() call. A remote attacker can send a specially crafted URL request, inject and execute arbitrary PHP code on the system.

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

Note: the vulnerability was being actively exploited.

External links:

http://www.h-fj.com/blog/archives/2015/05/15-112843.php
http://jvn.jp/en/jp/JVN64459670/index.html
http://jvndb.jvn.jp/en/contents/2015/JVNDB-2015-000067.html

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.