Microsoft Windows CryptoAPI NULL spoofing
| win-cryptoapi-null-spoofing (53535) |  Medium Risk |
Description:
Microsoft Windows CryptoAPI could allow a remote attacker to conduct spoofing attacks, caused by the improper parsing of NULL terminators in X.509 certificates. By persuading a victim to visit a Web site containing a specially-crafted X.509 certificate with NULL terminators in the Common Name (CN) field, a remote attacker could exploit this vulnerability using man-in-the-middle techniques to cause the victim to accept an invalid certificate as valid and redirect a user to a malicious Web site that would appear to be trusted.
*CVSS:
| Base Score: | 4.3 |
| Access Vector: | Network |
| Access Complexity: | Medium |
| Authentication: | None |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 3.2 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Gain Access
Remedy:
Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS09-056. See References.
References:
- Microsoft Security Bulletin MS09-056: Vulnerabilities in Windows CryptoAPI Could Allow Spoofing (974571).
- BID-36475: Microsoft Internet Explorer NULL Byte CA SSL Certificate Validation Security Bypass Vulnerability
- CVE-2009-2510: The CryptoAPI component in Microsoft Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7, as used by Internet Explorer and other applications, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, aka Null Truncation in X.509 Common Name Vulnerability
- SA36999: Microsoft Windows CryptoAPI Two Spoofing Vulnerabilities
Platforms Affected:
- Microsoft Windows 2000 SP4
- Microsoft Windows 7.0 x32
- Microsoft Windows 7.0 x64
- Microsoft Windows Server 2008 32-bit
- Microsoft Windows Server 2008 SP2 x32
- Microsoft Windows Vista SP1 x64
- Microsoft Windows Vista SP1
- Microsoft Windows Server 2003 SP2 Itanium
- Microsoft Windows Server 2003 SP2 x64
- Microsoft Windows Server 2003 SP2
- Microsoft Windows Server 2008 SP2 Itanium
- Microsoft Windows Server 2008 Itanium
- Microsoft Windows Server 2008 R2 Itanium
- Microsoft Windows Server 2008 R2 x64
- Microsoft Windows Server 2008 SP2 x64
- Microsoft Windows Server 2008 x64
- Microsoft Windows Vista
- Microsoft Windows Vista x64
- Microsoft Windows Vista SP2
- Microsoft Windows Vista SP2 x64
- Microsoft Windows XP SP3
- Microsoft Windows XP SP2 x64 Professional
- Microsoft Windows XP SP2
Reported:
Oct 13, 2009
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.