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Vulnerability Alert

Microsoft Windows SSL Downgrade Vulnerability

 
Threat Type:CWE-200: Information Leak / Disclosure
IntelliShield ID:27740
Version:1
First Published:2013 January 08 13:15 GMT
Last Published:2013 January 08 13:15 GMT
Port: Not available
CVE:CVE-2013-0013
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.2
Related Resources:
View related Applied Mitigation BulletinView related Event Response
 
 
Version Summary:Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions. 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 handling of SSL version 3 (SSLv3) and Transport Layer Security (TLS) session version negotiation by the affected software. An unauthenticated, remote attacker who has successfully intercepted web traffic handshakes could exploit the vulnerability by injecting crafted content into an SSL/TLS session. If successful, the attacker could bypass security restrictions in SSLv3 by downgrading to SSLv2.

Microsoft confirmed the vulnerability in a security bulletin and released software updates.
 
Warning Indicators
The following Microsoft products are vulnerable:
  • Windows Vista SP2
  • Windows Vista x64 Edition SP2
  • Windows Server 2008 for 32-bit Systems SP2
  • Windows Server 2008 for x64-based Systems SP2
  • Windows Server 2008 for Itanium-based Systems SP2
  • Windows 7 for 32-bit Systems SP1 and prior
  • Windows 7 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for Itanium-based Systems SP1 and prior
  • Windows 8 for 32-bit Systems
  • Windows 8 for x64-based Systems
  • Windows Server 2012
  • Windows RT
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must intercept an SSL/TLS session, possibly by performing a man-in-the-middle attack against the targeted system. This requirement decreases the likelihood of a successful exploit.

Microsoft has corrected this vulnerability by modifying the way the Windows SSL provider component handles encrypted network packets.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the January 2013 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 January 2013
 
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS13-006
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to downgrade an SSLv3 or TLS connection to SSLv2, which could weaken security on an affected system.
 
Technical Information
The vulnerability is due to improper handling of SSLv3 and TLS session version negotiation by the affected software while encrypting network traffic.

An unauthenticated, remote attacker who has successfully intercepted web traffic handshakes could exploit the vulnerability by injecting crafted content into an SSL/TLS session. If successful, the attacker could bypass security restrictions in SSLv3 by downgrading to SSLv2.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider disabling SSLv2 in Internet Explorer and Internet Information Services (IIS).

Administrators are advised to monitor affected 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 7 for 32-bit systems Base, SP1 | for x64-based systems Base, SP1
Microsoft, Inc.Windows RT Original Release Base
Microsoft, Inc.Windows Server 2008 Datacenter Edition SP2 | Datacenter Edition, 64-bit SP2 | Itanium-Based Systems Edition SP2 | Enterprise Edition SP2 | Enterprise Edition, 64-bit SP2 | Essential Business Server Standard SP2 | Essential Business Server Premium SP2 | Essential Business Server Premium, 64-bit SP2 | Standard Edition SP2 | Standard Edition, 64-bit SP2 | Web Server SP2 | Web Server, 64-bit SP2
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
Microsoft, Inc.Windows Vista Home Basic SP2 | Home Premium SP2 | Business SP2 | Enterprise SP2 | Ultimate SP2 | Home Basic x64 Edition SP2 | Home Premium x64 Edition SP2 | Business x64 Edition SP2 | Enterprise x64 Edition SP2 | Ultimate x64 Edition SP2
Microsoft, Inc.Windows 8 for 32-bit systems Base | for x64-based systems Base

Associated Products:
N/A




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