Vulnerability Details : CVE-2013-3661
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.
Vulnerability category: Directory traversalDenial of service
Exploit prediction scoring system (EPSS) score for CVE-2013-3661
Probability of exploitation activity in the next 30 days: 0.04%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 8 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2013-3661
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
4.9
|
MEDIUM | AV:L/AC:L/Au:N/C:N/I:N/A:C |
3.9
|
6.9
|
NIST |
CWE ids for CVE-2013-3661
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The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by: nvd@nist.gov (Primary)
References for CVE-2013-3661
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http://www.reddit.com/r/netsec/comments/1eqh66/0day_windows_kernel_epathobj_vulnerability/
0day: Windows Kernel EPATHOBJ Vulnerability : netsec
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http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flaw
Google engineer publicizes Windows zero-day bug, claims Microsoft is 'difficult to work with' - The Verge
- http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0006.html
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http://www.computerworld.com/s/article/9239477
Google engineer bashes Microsoft's handling of security researchers, discloses Windows zero-day | Computerworld
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http://www.exploit-db.com/exploits/25611/
Microsoft Windows - Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase - Windows dos Exploit
- http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0094.html
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http://twitter.com/taviso/statuses/335557286657400832
Tavis Ormandy on Twitter: "I just realised a really cute trick to exploit the EPATHOBJ bug, make the list cycle, then a thread can clean up the pool, and patch it!"
Products affected by CVE-2013-3661
- cpe:2.3:o:microsoft:windows_xp:*:sp3:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_xp:-:sp2:x64:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2003:*:sp2:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_vista:-:sp2:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_7:-:sp1:x86:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_7:-:sp1:x64:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_8:-:-:x64:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_8:-:-:x86:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_rt:-:*:*:*:*:*:*:*