Microsoft Windows EPATHOBJ::bFlatten path traversal

CVSS Meta Temp Score
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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Microsoft Windows. This affects the function EPATHOBJ::bFlatten. The manipulation leads to path traversal. This vulnerability is uniquely identified as CVE-2013-3661. Local access is required to approach this attack. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in Microsoft Windows (Operating System) (the affected version is unknown). It has been rated as problematic. This issue affects the function EPATHOBJ::bFlatten. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. 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. Impacted is availability. The summary by CVE is:

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.

The weakness was disclosed 05/24/2013 (Website). It is possible to read the advisory at theverge.com. The identification of this vulnerability is CVE-2013-3661. The exploitation is known to be easy. Attacking locally is a requirement. A simple authentication is needed for exploitation. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 66878 , which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 90894 (Microsoft Windows Kernel-Mode Drivers Remote Code Execution (MS13-053)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (84571), Tenable (66878), SecurityFocus (BID 60159†), OSVDB (93539†) and Vulnerability Center (SBV-40002†). The entries VDB-8829, VDB-9398, VDB-9399 and VDB-9400 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.0

VulDB Base Score: 5.5
VulDB Temp Score: 5.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 66878
Nessus File: 🔍
Nessus Risk: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/17/2013 🔍
05/24/2013 +6 days 🔍
05/24/2013 +0 days 🔍
05/24/2013 +0 days 🔍
06/16/2013 +23 days 🔍
03/24/2015 +646 days 🔍
05/14/2025 +3704 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: theverge.com
Status: Not defined

CVE: CVE-2013-3661 (🔍)
GCVE (CVE): GCVE-0-2013-3661
GCVE (VulDB): GCVE-100-64187
X-Force: 84571
SecurityFocus: 60159
Secunia: 53435
OSVDB: 93539
Vulnerability Center: 40002 - Microsoft Windows win32k.sys \x27EPATHOBJ::bFlatten\x27 Function Allows Local DoS, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 03/24/2015 15:54
Updated: 05/14/2025 18:41
Changes: 03/24/2015 15:54 (39), 04/07/2017 16:05 (14), 01/02/2022 20:27 (3), 01/02/2022 20:35 (7), 01/02/2022 20:43 (1), 05/14/2025 18:41 (24)
Complete: 🔍
Cache ID: 216::103

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