CVE-2013-3660
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
5Tags
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."
Analysis
The EPATHOBJ::pprFlattenRec function in Windows win32k.sys fails to properly initialize list pointers, allowing local users to gain SYSTEM privileges through kernel-mode code execution on Windows XP through Windows 8.
Technical Context
The CWE-119 flaw is in the GDI subsystem's path flattening code. When processing complex path objects, the pprFlattenRec function leaves a next-pointer uninitialized in certain edge cases. An attacker can fill the uninitialized memory with controlled data through heap manipulation, then trigger a write-what-where condition for kernel code execution.
Affected Products
['Microsoft Windows XP SP2/SP3', 'Microsoft Windows Server 2003 SP2', 'Microsoft Windows Vista SP2', 'Microsoft Windows 7 SP1', 'Microsoft Windows 8', 'Microsoft Windows Server 2008/2012']
Remediation
Apply Microsoft security update MS13-053. Implement kernel exploit mitigations available in Windows 8.1+ (SMEP, CFG).
Priority Score
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External POC / Exploit Code
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