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Security Intelligence Operations
Microsoft Windows X.509 Integer Overflow Spoofing Vulnerability |
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| Vulnerability Alert | Powered by  |
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| Threat Type: | Exploit Host or Network Trust: Exploit System Trust |
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| IntelliShield ID: | 19158 |
| Version: | 3 |
| First Published: | October 13, 2009 02:30 PM EDT |
| Last Published: | November 02, 2009 08:41 AM EST |
| Vector: | Network |
| Authentication: | None |
| Exploit: | Proof-of-Concept |
| Port: |
Not Available
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| CVE: | CVE-2009-2511 |
 BugTraq ID: | 36577 |
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| Urgency: |
Unlikely Use
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| Credibility: |
Confirmed
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| Severity: |
Mild Damage
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| CVSS Base: | 5.8 |
CVSS Calculator
CVSS Version 2
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| CVSS Temporal: | 4.5 |
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| Version Summary: | Proof-of-concept code that exploits the Microsoft Windows X.509 integer overflow spoofing vulnerability is publicly available. |
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| Description |
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Microsoft Windows contains a vulnerability that can allow an unauthenticated, remote attacker to spoof the identity of another user or computer.
The vulnerability is in the Windows CryptoAPI and is due to improper handling of integers in object identifiers. An exploit could allow the attacker to trick a user into believing that a transaction has been established with a trusted third party, which may in turn lead to transactions based on an improper trust relationship with the attacker.
Proof-of-concept code that exploits this vulnerability is publicly available.
Microsoft has confirmed this vulnerability in a security advisory and released patches that correct it. |
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| Warning Indicators |
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The following versions of Microsoft Windows are affected:
- Windows 2000 SP4 and prior
- Windows XP SP3 and prior
- Windows XP Professional x64 Edition SP2 and prior
- Windows Server 2003 SP2 and prior
- Windows Server 2003 x64 Edition SP2 and prior
- Windows Server 2003 for Itanium-based Systems SP2 and prior
- Windows Vista SP2 and prior
- Windows Vista x64 Edition SP2 and prior
- Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems SP2
- Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems SP2
- Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems SP2
- Windows Server 2008 R2 for x64-based Systems
- Windows Server 2008 R2 for Itanium-based Systems
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| IntelliShield Analysis |
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The vulnerability primarily affects client systems that use HTTPS connections, as well as other systems that rely on X.509 certificates to secure other communications. If an attacker can successfully generate a malicious X.509 certificate using this flaw, the certificate could be used in phishing activities against users while bypassing one of the primary means to establish trust for online transactions.
The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the October 2009 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 October 2009
Microsoft has corrected this vulnerability by changing the way that the CryptoAPI validates object identifiers.
As a result of applying the patch for this vulnerability, Live Communications Server 2005 and Office Communications Server 2007 malfunctioned and users were unable to connect to these servers. Microsoft has released a knowledgebase article to provide more details and a resolution at this link: 974571 |
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| Vendor Announcements |
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Microsoft has re-released a security bulletin at the following link: MS09-056 |
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| Impact |
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An unauthenticated, remote attacker could exploit this vulnerability to spoof the identity of another user or computer. For example, an attacker may be able to register an SSL certificate with the Common Name of a targeted website and cause that certificate to be accepted as valid. |
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| Technical Information |
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The vulnerability exists because the Windows CryptoAPI does not properly handle integers when parsing object identifiers. An attacker can register a malformed X.509 certificate to spoof the identity of a valid user or computer.
If an attacker registers a certificate that contains malformed object identifiers, a victim can be fooled into thinking that the certificate is valid for a trusted domain. |
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| Safeguards |
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Administrators are encouraged to apply the appropriate updates.
Users should verify that unsolicited links are safe to follow.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints. |
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| Patches/Software |
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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 Windows Update website. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates. |
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| Alert History |
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Version 2, October 30, 2009, 2:41 PM: Microsoft has re-released a security advisory to address a known issue in the fix for the Microsoft Windows X.509 integer overflow spoofing vulnerability.
Version 1, October 13, 2009, 2:30 PM: Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to spoof the identity of a user or computer identified by an X.509 certificate. Patches are available. |
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Product Sets |
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The security vulnerability applies to the following combinations of products.
| Primary Products: |
| Microsoft, Inc. | Windows 2000 | Advanced Server Base, SP1, SP2, SP3, SP4, rev.2031, rev.2072, rev.2195 | Datacenter Server Base, SP1, SP2, SP3, SP4 | Professional Base, SP1, SP2, SP3, SP4 | Server Base, SP1, SP2, SP3, SP4 |
| Microsoft, Inc. | Windows Server 2003 | Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP1, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP1, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit (Itanium) Base, SP1, SP2 | Standard Edition x64 (AMD/EM64T) Base, SP1, SP2 | Web Edition Base, SP1, SP2 |
| Microsoft, Inc. | Windows Server 2008 | Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit Base, SP1, SP2 | Essential Business Server Premium Base, SP1, SP2 | Essential Business Server Premium, 64-bit Base, SP1, SP2 | Essential Business Server Standard Base, SP1, SP2 | Itanium-Based Systems Edition Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit Base, SP1, SP2 | Web Server Base, SP1, SP2 | Web Server, 64-bit Base, SP1, SP2 |
| Microsoft, Inc. | Windows Vista | Business Base, SP1, SP2 | Business x64 Edition Base, SP1, SP2 | Enterprise Base, SP1, SP2 | Enterprise x64 Edition Base, SP1, SP2 | Home Basic Base, SP1, SP2 | Home Basic x64 Edition Base, SP1, SP2 | Home Premium Base, SP1, SP2 | Home Premium x64 Edition Base, SP1, SP2 | Ultimate Base, SP1, SP2 | Ultimate x64 Edition Base, SP1, SP2 |
| Microsoft, Inc. | Windows XP | Home Edition Base, SP1, SP2, SP3 | Media Center Edition 2005, Base | Original Release Base, SP1 | Professional Edition Base, SP1, SP2, SP3 | Professional Edition, 64-bit (Itanium) 2003 (itanium 2), Base, SP1, SP2 | Professional x64 (AMD/EM64T) Base, SP1, SP2 | Tablet PC Edition 2005, Base |
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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. |
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