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Microsoft Windows ASN.1 Library Integer Handling Vulnerability

Risk
High

Date Discovered
02-10-2004

Description
The Microsoft Windows ASN.1 parsing library has been reported to be prone to an integer handling vulnerability. The issue is reported to exist because an integer value that is contained as a part of ASN.1 based communications is interpreted as an unsigned integer. Because this integer value is assumed trusted, unsigned, and conjectured to be then further employed in potentially sensitive computations, memory corruption may result.

Symantec AntiVirus Products
A heuristic detection has been released to detect possible exploits of this vulnerability. This detection is named Bloodhound.Exploit.5.

Symantec Enterprise Firewall
For Windows based firewalls, unique initial and ongoing system hardening automatically protects the firewall machine and the firewall operating system itself. No additional configuration or patch is required.

Symantec Enterprise Security Manager
Symantec Enterprise Security Manager™ posted an update to the OS Patch Policy that detects and reports systems that are not patched against this vulnerability. Click here for the advisory released February 10, 2004.

Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released February 10, 2004.

Platforms Affected
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Advanced Server SP1
Microsoft Windows 2000 Advanced Server SP2
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Datacenter Server SP1
Microsoft Windows 2000 Datacenter Server SP2
Microsoft Windows 2000 Server
Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Terminal Services
Microsoft Windows 2000 Terminal Services SP1
Microsoft Windows 2000 Terminal Services SP2

Components Affected
Microsoft Windows 2000 Advanced Server SP4
Microsoft Windows 2000 Advanced Server SP3
Microsoft Windows 2000 Advanced Server SP2
Microsoft Windows 2000 Advanced Server SP1
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Professional SP4
Microsoft Windows 2000 Professional SP3
Microsoft Windows 2000 Professional SP2
Microsoft Windows 2000 Professional SP1
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Server SP4
Microsoft Windows 2000 Server SP3
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server
Microsoft Windows NT Server 4.0 SP6a
Microsoft Windows NT Server 4.0 SP6
Microsoft Windows NT Server 4.0 SP5
Microsoft Windows NT Server 4.0 SP4
Microsoft Windows NT Server 4.0 SP3
Microsoft Windows NT Server 4.0 SP2
Microsoft Windows NT Server 4.0 SP1
Microsoft Windows NT Server 4.0
Microsoft Windows NT Terminal Server 4.0 SP6
Microsoft Windows NT Terminal Server 4.0 SP5
Microsoft Windows NT Terminal Server 4.0 SP4
Microsoft Windows NT Terminal Server 4.0 SP3
Microsoft Windows NT Terminal Server 4.0 SP2
Microsoft Windows NT Terminal Server 4.0 SP1
Microsoft Windows NT Terminal Server 4.0
Microsoft Windows NT Workstation 4.0 SP6a
Microsoft Windows NT Workstation 4.0 SP6
Microsoft Windows NT Workstation 4.0 SP5
Microsoft Windows NT Workstation 4.0 SP4
Microsoft Windows NT Workstation 4.0 SP3
Microsoft Windows NT Workstation 4.0 SP2
Microsoft Windows NT Workstation 4.0 SP1
Microsoft Windows NT Workstation 4.0
Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Datacenter Edition 64-bit
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Enterprise Edition 64-bit
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows XP 64-bit Edition SP1
Microsoft Windows XP 64-bit Edition
Microsoft Windows XP 64-bit Edition Version 2003 SP1
Microsoft Windows XP 64-bit Edition Version 2003
Microsoft Windows XP Home SP1
Microsoft Windows XP Home
Microsoft Windows XP Professional SP1
Microsoft Windows XP Professional

Recommendations
Block external access at the network boundary, unless service is required by external parties.
If possible, filter ASN.1 based communications at the network perimeter. Allow communications for trusted hosts and networks only.

Microsoft has released a security update (MS04-007) to address this issue in affected versions of Microsoft Windows. Users are strongly advised to obtain fixes as soon as possible.


Microsoft Windows 2000 Advanced Server SP4:

Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Advanced Server SP3:
Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Advanced Server SP2:
Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Advanced Server SP1:
Microsoft Windows 2000 Advanced Server :
Microsoft Windows 2000 Professional SP4:
Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Professional SP3:
Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Professional SP2:
Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Professional SP1:
Microsoft Windows 2000 Professional :
Microsoft Windows 2000 Server SP4:
Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Server SP3:
Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Server SP2:
Microsoft Upgrade Security Update for Windows 2000: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=191853C4-A4D2-4797-A8C6-A2E663A53698&displaylang=en

Microsoft Windows 2000 Server SP1:
Microsoft Windows 2000 Server :
Microsoft Windows NT Server 4.0 SP6a:
Microsoft Upgrade Security Update for Windows NT Server 4.0: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=E8315430-90CD-4B20-8F54-58527932B588&displaylang=en

Microsoft Windows NT Server 4.0 SP6:
Microsoft Windows NT Server 4.0 SP5:
Microsoft Windows NT Server 4.0 SP4:
Microsoft Windows NT Server 4.0 SP3:
Microsoft Windows NT Server 4.0 SP2:
Microsoft Windows NT Server 4.0 SP1:
Microsoft Windows NT Server 4.0:
Microsoft Windows NT Terminal Server 4.0 SP6:
Microsoft Upgrade Security Update for Windows NT Server Terminal Server Edition: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=D83B39D3-FF13-4D0B-B406-A225AED0D659&displaylang=en

Microsoft Windows NT Terminal Server 4.0 SP5:
Microsoft Windows NT Terminal Server 4.0 SP4:
Microsoft Windows NT Terminal Server 4.0 SP3:
Microsoft Windows NT Terminal Server 4.0 SP2:
Microsoft Windows NT Terminal Server 4.0 SP1:
Microsoft Windows NT Terminal Server 4.0:
Microsoft Windows NT Workstation 4.0 SP6a:
Microsoft Upgrade Security Update for Windows NT Workstation 4.0: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=92400199-B3D5-4826-98D4-F134849F5249&displaylang=en

Microsoft Windows NT Workstation 4.0 SP6:
Microsoft Windows NT Workstation 4.0 SP5:
Microsoft Windows NT Workstation 4.0 SP4:
Microsoft Windows NT Workstation 4.0 SP3:
Microsoft Windows NT Workstation 4.0 SP2:
Microsoft Windows NT Workstation 4.0 SP1:
Microsoft Windows NT Workstation 4.0:
Microsoft Windows Server 2003 Datacenter Edition :
Microsoft Upgrade Security Update for Windows Server 2003: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=3D7FFFF9-A497-42FF-90E7-283732B2E117&displaylang=en

Microsoft Windows Server 2003 Datacenter Edition 64-bit :
Microsoft Upgrade Security Upd for Windows Server 2003 64-bit Edition/Windows XP 64-bit Edition Version 2003:KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=FA280168-66E1-4B5F-958F-E178C3F61F7C&displaylang=en

Microsoft Windows Server 2003 Enterprise Edition :
Microsoft Upgrade Security Update for Windows Server 2003: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=3D7FFFF9-A497-42FF-90E7-283732B2E117&displaylang=en

Microsoft Windows Server 2003 Enterprise Edition 64-bit :
Microsoft Upgrade Security Upd for Windows Server 2003 64-bit Edition/Windows XP 64-bit Edition Version 2003:KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=FA280168-66E1-4B5F-958F-E178C3F61F7C&displaylang=en

Microsoft Windows Server 2003 Standard Edition :
Microsoft Upgrade Security Update for Windows Server 2003: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=3D7FFFF9-A497-42FF-90E7-283732B2E117&displaylang=en

Microsoft Windows Server 2003 Web Edition :
Microsoft Upgrade Security Update for Windows Server 2003: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=3D7FFFF9-A497-42FF-90E7-283732B2E117&displaylang=en

Microsoft Windows XP 64-bit Edition SP1:
Microsoft Upgrade Security Update for Windows XP 64-Bit Edition: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=383C397F-9318-4AD5-9C2C-0577118A1E68&displaylang=en

Microsoft Windows XP 64-bit Edition :
Microsoft Upgrade Security Update for Windows XP 64-Bit Edition: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=383C397F-9318-4AD5-9C2C-0577118A1E68&displaylang=en

Microsoft Windows XP 64-bit Edition Version 2003 SP1:
Microsoft Upgrade Security Upd for Windows Server 2003 64-bit Edition/Windows XP 64-bit Edition Version 2003:KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=FA280168-66E1-4B5F-958F-E178C3F61F7C&displaylang=en

Microsoft Windows XP 64-bit Edition Version 2003 :
Microsoft Upgrade Security Upd for Windows Server 2003 64-bit Edition/Windows XP 64-bit Edition Version 2003:KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=FA280168-66E1-4B5F-958F-E178C3F61F7C&displaylang=en

Microsoft Windows XP Home SP1:
Microsoft Upgrade Security Update for Windows XP: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=0CC30297-D4AE-48E9-ACD0-1343D89CCBBA&displaylang=en

Microsoft Windows XP Home :
Microsoft Upgrade Security Update for Windows XP: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=0CC30297-D4AE-48E9-ACD0-1343D89CCBBA&displaylang=en

Microsoft Windows XP Professional SP1:
Microsoft Upgrade Security Update for Windows XP: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=0CC30297-D4AE-48E9-ACD0-1343D89CCBBA&displaylang=en

Microsoft Windows XP Professional :
Microsoft Upgrade Security Update for Windows XP: KB828028
http://www.microsoft.com/downloads/details.aspx?FamilyId=0CC30297-D4AE-48E9-ACD0-1343D89CCBBA&displaylang=en

References
Source: Microsoft ASN.1 Library Bit String Heap Corruption
URL: http://www.eeye.com/html/Research/Advisories/AD20040210-2.html

Source: Microsoft ASN.1 Library Length Overflow Heap Corruption
URL: http://www.eeye.com/html/Research/Advisories/AD20040210.html

Source: Microsoft Security Bulletin MS04-007
URL: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS04-007.asp

Credits
Discovery of this vulnerability has been credited to eEye Digital Security.


Copyright (c) 2004 by Symantec Corp.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from symsecurity@symantec.com.

Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.

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