ISS Security Brief: Microsoft ASN.1 Integer Manipulation Vulnerabilities
From: X-Force (xforce_at_iss.net)
To: email@example.com Date: Wed, 11 Feb 2004 12:54:50 -0500 (EST)
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Internet Security Systems Security Brief
February 11, 2004
Microsoft ASN.1 Integer Manipulation Vulnerabilities
Microsoft has release Security Bulletin MS04-007 to address vulnerabilities
in the ASN.1 parsing component of the Windows Operating Systems. This
component is used by several applications for transmission of data across
the network. Some examples of applications which make use of ASN.1 include
Internet Explorer and IIS for certificate parsing, NTLMv2 authentication,
Kerberos authentication, ISAKMP, LDAP and Exchange.
The vulnerability could be exploited by remote attackers to cause a Denial
of Service (DoS) or potentially gain access to a vulnerable machine with
the privileges of the services being exploited. This vulnerability may be
exploited in many default configurations if vulnerable services are remotely
There are currently no known exploits in the wild for this issue. Due to
the nature of this vulnerability, reliable and successful remote
exploitation is considered difficult.
Known Affected Products:
Microsoft Windows NT4, 2000, XP and 2003 when used with one of the
- - NTLMv2 authentication
- - Internet Explorer
- - Outlook
- - IIS 4.0, 5.0, 5.1 and 6.0 with client certificate parsing enabled
- - ISAKMP/IPSec
- - Exchange 5.x, 2000, 2003
- - LDAP
- - Kerberos
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