CVE-2009-2511

Name of the Vulnerable Software and Affected Versions Microsoft Windows versions prior to the fixed version

Description The issue is related to an integer overflow in the CryptoAPI component when parsing X.509 certificates with malformed ASN.1 Object Identifiers. This allows man-in-the-middle attackers to spoof arbitrary SSL servers and other entities via a certificate issued by a legitimate Certification Authority. An attacker could impersonate another user or system by exploiting this vulnerability.

Recommendations For 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, update to a version that includes the fix for the integer overflow in the CryptoAPI component. As a temporary workaround, consider restricting the use of X.509 certificates with ASN.1 object identifiers to minimize the risk of exploitation.