Zero-day vulnerability in PHP

Buffer overflow
CVE-2012-2376

Bug with Variant type parsing was originally discovered by Condis. There is evidence this vulnerability was being exploited in the wild before official patch release.

Known malware:

Trojan.Filecoder

Vulnerability details

Advisory: SB2012051101 - Remote code execution in PHP

Vulnerable component: PHP

CVE-ID: CVE-2012-2376

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-119 - Memory corruption

Description:

The vulnerability allows a remote attacker to cause DoS conditions or execute arbitrary code on the target system.

The weakness exists due to buffer overflow in the com_print_typeinfo function. A remote attacker can send a specially crafted arguments, trigger incorrect handling of COM object VARIANT types and cause the target application to crash or execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in denial of service or arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Public Exploits:

- PHP 5.4.3 (Windows x86 Polish) - Code Execution [Exploit-DB]

External links:

http://openwall.com/lists/oss-security/2012/05/20/2

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.