Vulnerability Note VU#216324

Microsoft ASN.1 Library improperly decodes malformed ASN.1 length values

Overview

The Microsoft ASN.1 Library improperly decodes malformed ASN.1 length values which could allow an unauthenticated, remote attacker to execute arbitrary code with SYSTEM privileges.

I. Description

Abstract Syntax Notation number One (ASN.1) is an international standard used to describe and transmit data packets between applications and across networks. There is a buffer overflow vulnerability in the Microsoft ASN.1 Library that could allow an unauthenticated, remote attacker to execute arbitrary code with SYSTEM privileges on the affected system.

II. Impact

An unauthenticated, remote attacker could execute arbitrary code with SYSTEM privileges.

III. Solution

Apply Patch

Apply the patch (828028) referenced in Microsoft Security Bulletin MS04-007.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Vulnerable	10-Feb-2004

References

http://www.microsoft.com/technet/security/bulletin/MS04-007.asp
http://support.microsoft.com/default.aspx?scid=252648
http://www.eeye.com/html/Research/Advisories/AD20040210.html
http://www.itu.int/ITU-T/asn1/
http://www.asn1.org/

Credit

This vulnerability was reported by eEye Digital Security.

This document was written by Damon Morda.

Other Information

Date Public:	2004-02-10
Date First Published:	2004-02-10
Date Last Updated:	2004-02-11
CERT Advisory:
CVE-ID(s):	CAN-2003-0818
NVD-ID(s):	CAN-2003-0818
US-CERT Technical Alerts:
Metric:	27.72
Document Revision:	18

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