SSL: X.509 Common Name(CN) Null Byte Truncation
This signature detects attempts to exploit a known vulnerability in X.509 certificates. A successful attack allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.
Extended Description
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," a related issue to CVE-2009-2408.
Affected Products
Microsoft windows_vista
Short Name
SSL:X509-CN-NULL-BYTE
Severity
Major
Recommended
False
Recommended Action
Drop
Category
SSL
Keywords
Byte CVE-2009-2510 Common Name(CN) Null Truncation X.509 bid:36475
Release Date
04/16/2014
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3659
False Positive
Unknown
Vendors
Microsoft
CVSS Score
6.8