Microsoft Windows Client/Server Run-Time Subsystem access control

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Microsoft Windows. The affected element is an unknown function of the component Client/Server Run-Time Subsystem. Performing a manipulation results in access control. This vulnerability is known as CVE-2011-1967. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Microsoft Windows (Operating System) (version now known). This affects some unknown processing of the component Client/Server Run-Time Subsystem. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, and integrity. The summary by CVE is:

Winsrv.dll in the Client/Server Run-time Subsystem (aka CSRSS) in the Win32 subsystem in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly check permissions for sending inter-process device-event messages from low-integrity processes to high-integrity processes, which allows local users to gain privileges via a crafted application, aka "CSRSS Vulnerability."

The weakness was published 08/09/2011 by Alex Ionescu with Winsider Seminars & Solutions Inc. as MS11-063 as confirmed bulletin (Technet). It is possible to read the advisory at microsoft.com. This vulnerability is uniquely identified as CVE-2011-1967 since 05/09/2011. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 55793 (MS11-063: Vulnerability in Windows Client/Server Run-time Subsystem Could Allow Elevation of Privilege (2567680)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The commercial vulnerability scanner Qualys is able to test this issue with plugin 90721 (Microsoft Windows Client/Server Run-time Subsystem Elevation of Privilege Vulnerability (MS11-063)).

Upgrading eliminates this vulnerability. Applying the patch MS11-063 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (68800), Tenable (55793), SecurityFocus (BID 48992†), Secunia (SA45478†) and Vulnerability Center (SBV-32649†). Similar entries are available at VDB-4393, VDB-4394, VDB-4392 and VDB-4396. 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: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 55793
Nessus Name: MS11-063: Vulnerability in Windows Client/Server Run-time Subsystem Could Allow Elevation of Privilege (2567680)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 902463
OpenVAS Name: Microsoft Windows Client/Server Run-time Subsystem Privilege Escalation Vulnerability (2567680)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: MS11-063

Timelineinfo

05/09/2011 🔍
08/09/2011 +92 days 🔍
08/09/2011 +0 days 🔍
08/09/2011 +0 days 🔍
08/09/2011 +0 days 🔍
08/09/2011 +0 days 🔍
08/10/2011 +1 days 🔍
08/10/2011 +0 days 🔍
08/19/2011 +9 days 🔍
01/12/2025 +4895 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS11-063
Researcher: Alex Ionescu
Organization: Winsider Seminars & Solutions Inc.
Status: Confirmed

CVE: CVE-2011-1967 (🔍)
GCVE (CVE): GCVE-0-2011-1967
GCVE (VulDB): GCVE-100-4395

OVAL: 🔍
IAVM: 🔍

X-Force: 68800
SecurityFocus: 48992 - Microsoft Windows CSRSS CVE-2011-1967 Local Privilege Escalation Vulnerability
Secunia: 45478 - Windows Client/Server Run-time Subsystem Privilege Escalation, Less Critical
Vulnerability Center: 32649 - [MS11-063] Microsoft Windows CSRSS Local Privileges Escalation Vulnerability, High

See also: 🔍

Entryinfo

Created: 08/19/2011 02:00
Updated: 01/12/2025 23:11
Changes: 08/19/2011 02:00 (81), 03/29/2017 17:01 (8), 03/19/2021 13:52 (3), 01/12/2025 23:11 (16)
Complete: 🔍
Cache ID: 216::103

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