MinorRev: Microsoft Security Bulletin MS04-007 - ASN.1 Vulnerability Could Allow Code Execution (828028)
From: Russ Cooper (Russ.Cooper_at_TRUSECURE.CA)
Date: 06/15/04
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Date: Tue, 15 Jun 2004 17:34:55 -0400 To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM
Microsoft Security Bulletin MS04-007:
ASN.1 Vulnerability Could Allow Code Execution (828028)
Bulletin URL:
<http://www.microsoft.com/technet/security/bulletin/MS04-007.mspx>
Reason for Revision: Bulletin updated to reflect updated information in
the Windows NT 4.0 Security Update Information, Removal Instructions
section.
Version Number: 1.1
Issued Date: Tuesday, February 10, 2004
Revision Date: Wednesday, June 09, 2004
Impact of Vulnerability: Remote Code Execution
Maximum Severity Rating: Critical
Patch(es) Replaced: None
Caveats: Windows NT 4.0 (Workstation, Server, and Terminal Server
Edition) does not install the affected file by default. This file is
installed as part of the MS03-041 Windows NT 4.0 security update and
other possible non-security-related hotfixes. If the Windows NT 4.0
security update for MS03-041 is not installed, this may not be a
required update. To verify if the affected file is installed, search for
the file named Msasn1.dll. If this file is present, this security update
is required. Windows Update, Software Update Services, and the Microsoft
Security Baseline Analyzer will also correctly detect if this update is
required.
Tested Software:
Affected Software:
------------------
* Microsoft Windows NT. Workstation 4.0 Service Pack 6a
<http://tinyurl.com/2mt2m>
* Microsoft Windows NT Server 4.0 Service Pack 6a
<http://tinyurl.com/2ws5o>
* Microsoft Windows NT Server 4.0 Terminal Server Edition Service Pack 6
<http://tinyurl.com/3eek8>
* Microsoft Windows 2000 Service Pack 2, Microsoft Windows 2000 Service
Pack 3, Microsoft Windows 2000 Service Pack 4
<http://tinyurl.com/2ohre>
* Microsoft Windows XP, Microsoft Windows XP Service Pack 1
<http://tinyurl.com/284mg>
* Microsoft Windows XP 64-Bit Edition, Microsoft Windows XP 64-Bit
Edition Service Pack 1
<http://tinyurl.com/3d7f6>
* Microsoft Windows XP 64-Bit Edition Version 2003, Microsoft Windows XP
64-Bit Edition Version 2003 Service Pack 1
<http://tinyurl.com/2jfg8>
* Microsoft Windows Server(tm) 2003
<http://tinyurl.com/2lcpg>
* Microsoft Windows Server 2003 64-Bit Edition
<http://tinyurl.com/2jfg8>
Affected Components:
--------------------
* Microsoft ASN.1 Library
Technical Description:
----------------------
A security vulnerability exists in the Microsoft ASN.1 Library that
could allow code execution on an affected system. The vulnerability is
caused by an unchecked buffer in the Microsoft ASN.1 Library, which
could result in a buffer overflow.
An attacker who successfully exploited this buffer overflow
vulnerability could execute code with system privileges on an affected
system. The attacker could then take any action on the system, including
installing programs, viewing data, changing data, deleting data, or
creating new accounts with full privileges.
Abstract Syntax Notation 1 (ASN.1) is a data standard that is used by
many applications and devices in the technology industry for allowing
the normalization and understanding of data across various platforms.
More information about ASN.1 can be found in Microsoft Knowledge Base
Article 252648.
Revision History:
-----------------
* v1.0 - 2/10/2004: Bulletin published.
* v1.1 - 6/9/2004: Bulletin updated to reflect updated information in
the Windows NT 4.0 Security Update Information, Removal Instructions
section.
This email is sent to NTBugtraq automagically as a service to my
subscribers. (v4.01.1625.28734)
Cheers,
Russ - Senior Scientist - TruSecure Corporation/NTBugtraq Editor
-----
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