Vulnerability Alert

Microsoft Windows Certificate Revocation Bypass Vulnerability

 
Threat Type:CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID:27535
Version:1
First Published:2012 December 11 13:16 GMT
Last Published:2012 December 11 13:16 GMT
Port: Not available
CVE:CVE-2012-2549
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:2.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:1.6
 
Version Summary:Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions on a targeted system. Updates are available.
 
 
Description
Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions.

The vulnerability is due to improper validation of SSL certificates by the affected software when handling IP over HTTPS (IP-HTTPS) Tunneling Protocol communications. An authenticated, remote attacker with valid system or domain credentials could exploit the vulnerability by presenting a revoked SSL certificate to a service or application that uses the IP-HTTPS component of the affected software. A successful exploit could allow the attacker to bypass certificate validation security checks.

Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
 
Warning Indicators
The following Microsoft products are affected:
  • Windows Server 2008 R2 for x64-bit and Itanium SP1 and prior
  • Windows Server 2012
 
IntelliShield Analysis
To exploit the vulnerability, an attacker must possess a certificate issued from the targeted domain and valid system or domain credentials. These access requirements could reduce the likelihood of a successful exploit.

Microsoft has corrected this vulnerability by modifying the way Microsoft Windows validates certificates.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the December 2012 security bulletin release. This Cisco bulletin, which assists administrators in identifying or mitigating these vulnerabilities using Cisco devices, is available at the following link: Cisco Applied Mitigation Bulletin: Microsoft Security Bulletin Release for December 2012
 
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS12-083
 
Impact
An authenticated, remote attacker with valid system or domain credentials could exploit the vulnerability to bypass certificate validation security checks.
 
Technical Information
Additional technical information is not available.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have system, network, or domain access.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

Administrators are advised to monitor critical systems.
 
Patches/Software
Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Microsoft Update service. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Microsoft, Inc.Windows Server 2008 R2 x64-Based Systems Edition Base, SP1 | Itanium-Based Systems Edition Base, SP1
Microsoft, Inc.Windows Server 2012 Original Release Base

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
Powered by  IntelliShield