#VU4344 Sugnature verification bypass in Windows and Windows Server - CVE-2013-3900

Vulnerability identifier: #VU4344

Vulnerability risk: Critical

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red

CVE-ID: CVE-2013-3900

CWE-ID: CWE-310

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

Vulnerable software:
Windows
Windows Server

Software vendor:
Microsoft

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

The weakness exists due to improper validation of PE file digests during Authenticode signature verification within WinVerifyTrust function. A remote attacker can create specially crafted signed PE file, trick the victim into executing it and execute arbitrary code with privileges of the current user.

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

Note: the vulnerability was being actively exploited.

Install update from vendor's website.

• https://technet.microsoft.com/en-us/library/security/ms13-098.aspx
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2013-3900