Microsoft Windows 7/Server 2008 Kerberos improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

A vulnerability, which was classified as critical, has been found in Microsoft Windows 7/Server 2008 (Operating System). This issue affects an unknown code of the component Kerberos. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, and integrity. The summary by CVE is:

Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES encryption, which allows man-in-the-middle attackers to spoof network traffic and obtain sensitive information via a DES downgrade, aka "Kerberos Spoofing Vulnerability."

The weakness was published 02/08/2011 by Scott Stender with iSEC Partners as MS11-013 as confirmed bulletin (Technet). It is possible to read the advisory at microsoft.com. The identification of this vulnerability is CVE-2011-0091 since 12/21/2010. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 51913 (MS11-013: Vulnerabilities in Kerberos Could Allow Elevation of Privilege (2496930)), 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 90686 (Microsoft Windows Kerberos Elevation of Privilege Vulnerability (MS11-013)).

Applying the patch MS11-013 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 10807.

The vulnerability is also documented in the databases at X-Force (64901) and Tenable (51913). Similar entry is available at 4293.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.5
VulDB Temp Score: 5.7
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CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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Exploitinginfo

Class: Improper authentication
CWE: CWE-287
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

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Nessus ID: 51913
Nessus Name: MS11-013: Vulnerabilities in Kerberos Could Allow Elevation of Privilege (2496930)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 902288
OpenVAS Name: Microsoft Kerberos Privilege Escalation Vulnerabilities (2496930)
OpenVAS File: 🔍
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Qualys ID: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Patch: MS11-013
TippingPoint: 🔍

McAfee IPS: 🔍
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Timelineinfo

12/21/2010 🔍
02/08/2011 +49 days 🔍
02/08/2011 +0 days 🔍
02/08/2011 +0 days 🔍
02/08/2011 +0 days 🔍
02/09/2011 +1 days 🔍
02/09/2011 +0 days 🔍
02/09/2011 +0 days 🔍
02/10/2011 +0 days 🔍
02/16/2011 +6 days 🔍
03/18/2021 +3683 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS11-013
Researcher: Scott Stender
Organization: iSEC Partners
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-0091 (🔍)
OVAL: 🔍
IAVM: 🔍

X-Force: 64901 - Microsoft Windows Kerberos spoofing, Medium Risk
SecurityTracker: 1025048 - Windows Kerberos Lets Local Users Gain Elevated Privileges
Vulnerability Center: 29646 - [MS11-013] Microsoft Windows 7 and Windows Server 2008 R2 Spoofing Vulnerability, Medium
SecurityFocus: 46140 - Microsoft Windows Kerberos Encryption Standard Spoofing Vulnerability
Secunia: 43257 - Microsoft Windows Kerberos Authentication Encryption Downgrade Vulnerability, Less Critical
OSVDB: 70835 - Microsoft Windows Kerberos Authentication Downgrade Weakness
Vupen: ADV-2011-0326

scip Labs: https://www.scip.ch/en/?labs.20140213
See also: 🔍

Entryinfo

Created: 02/16/2011 11:26
Updated: 03/18/2021 19:52
Changes: 02/16/2011 11:26 (95), 04/07/2017 12:38 (14), 03/18/2021 19:52 (2)
Complete: 🔍

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