CVE-2013-3661
Description
The EPATHOBJ::bFlatten function in win32k.sys 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, Windows Server 2012, and Windows RT does not check whether linked-list traversal is continually accessing the same list member, which allows local users to cause a denial of service (infinite traversal) via vectors that trigger a crafted PATHRECORD chain.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Microsoft Windows - Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase
Microsoft Windows - 'EPATHOBJ::pprFlattenRec' Local Privilege Escalation (Metasploit)
Microsoft Windows NT/2000/2003/2008/XP/Vista/7/8 - 'EPATHOBJ' Local Ring
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| windows | - | affected | |
| windows | r2 | affected | |
| windows | affected | |
References
- http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0094.html
- http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0006.html
- http://secunia.com/advisories/53435
- http://twitter.com/taviso/statuses/335557286657400832
- http://www.computerworld.com/s/article/9239477
- http://www.exploit-db.com/exploits/25611/
- http://www.osvdb.org/93539
- http://www.reddit.com/r/netsec/comments/1eqh66/0day_windows_kernel_epathobj_vulnerability/
- http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flaw
- http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0094.html
- http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0006.html
- http://secunia.com/advisories/53435
- http://twitter.com/taviso/statuses/335557286657400832
- http://www.computerworld.com/s/article/9239477
- http://www.exploit-db.com/exploits/25611/
- http://www.osvdb.org/93539
- http://www.reddit.com/r/netsec/comments/1eqh66/0day_windows_kernel_epathobj_vulnerability/
- http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flaw
CWEs
CWE-22
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.