Zero-day vulnerability in Windows

Privilege escalation
CVE-2011-1249

Vulnerability details

Advisory: SB2011061402 - Privilege escalation in Microsoft Windows

Vulnerable component: Windows

CVE-ID: CVE-2011-1249

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

CWE-ID: CWE-20 - Improper input validation

Description:

The vulnerability allows a local user to gain elevated privileges on the target system.

The vulnerability exists due to improper validation of input passed from user mode to the kernel in the Ancillary Function Driver (afd.sys). By running a malicious application, a local attacker with valid login credentials can execute arbitrary code with system privileges.

Successful exploitation of this vulnerability will allow the local attacker to obtain elevated privileges on vulnerable system.

Note: the vulnerability was being actively exploited.

Public Exploits:

- Microsoft Windows (x86) - 'afd.sys' Privilege Escalation (MS11-046) [Exploit-DB]

- Microsoft Windows - 'afd.sys' PoC (MS11-046) [Exploit-DB]

External links:

https://technet.microsoft.com/en-us/library/security/ms11-046.aspx
https://www.fireeye.com/blog/threat-research/2014/10/two-targeted-attacks-two-new-zero-days.html
https://www.manageengine.com/products/desktop-central/patch-management/Windows-7-Ultimate-Edition/Wi...
http://www.hackingtutorials.org/exploit-tutorials/mingw-w64-how-to-compile-windows-exploits-on-kali-...

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.