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[ CVE-2013-3660 · Published 24 May 2013 ]

Microsoft Win32k Privilege Escalation Vulnerability

Exploited · CISA KEV CVSS 7.8 EPSS 39%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-03-28
  • EPSS: 39% chance of exploitation in the next 30 days (higher than 99% of CVEs)

[ Description ]Official description

The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, and Windows Server 2012 does not properly initialize a pointer for the next object in a certain list, which allows local users to obtain write access to the PATHRECORD chain, and consequently gain privileges, by triggering excessive consumption of paged memory and then making many FlattenPath function calls, aka "Win32k Read AV Vulnerability."

CISA: The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft does not properly initialize a pointer for the next object in a certain list, which allows local users to gain privileges.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 18 Apr 2022): Apply updates per vendor instructions.

[ References ]References