Zero-day vulnerability in Windows

Memory corruption
CVE-2011-3402

This vulnerability was being actively exploited by the Stuxnet in Duqu attack.

Known malware:

Win32/Exploit.CVE-2011-3402.G
W32.Duqu

Vulnerability details

Advisory: SB2011110101 - Remote code execution in Microsoft Windows

Vulnerable component: Windows

CVE-ID: CVE-2011-3402

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

CWE-ID: CWE-119 - Memory corruption

Description:

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

The weakness exists due to boundary error in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers. A remote attacker can create a specially crafted Word document or web page containing font data, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

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

Note: the vulnerability was being actively exploited.

External links:

https://www.symantec.com/connect/w32-duqu_status-updates_installer-zero-day-exploit
https://www.symantec.com/security_response/attacksignatures/detail.jsp?asid=25272
https://media.ccc.de/v/29c3-5417-en-cve_2011_3402_analysis_h264
https://securelist.com/blog/incidents/31445/the-mystery-of-duqu-part-two-23/
https://securingtomorrow.mcafee.com/mcafee-labs/the-day-of-the-golden-jackal-%e2%80%93-further-tales...
https://technet.microsoft.com/library/security/2639658
https://technet.microsoft.com/library/security/ms11-087
https://blogs.technet.microsoft.com/msrc/2011/11/03/microsoft-releases-security-advisory-2639658/
https://www.f-secure.com/v-descs/exploit_w32_cve_2011_3402_a.shtml
https://krebsonsecurity.com/tag/cve-2011-3402/
http://yomuds.blogspot.com/2012/11/cve-2011-3402-and-cool-exploit-kit_28.html
http://blog.crysys.hu/2013/01/encryption-related-to-duqu-font-expoit-cve-2011-3402/
https://blogs.forcepoint.com/security-labs/cve-2011-3402-vulnerability-truetype-font-parsing
https://www.totaldefense.com/security-blog/tag/cve-2011-3402

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.