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Microsoft Windows Private Communications Transport Protocol Buffer Overrun Vulnerability

Risk
High

Date Discovered
04-13-2004

Description
Various Microsoft Windows operating systems are prone to a remotely exploitable stack-based buffer overrun via the PCT (Private Communications Transport) protocol. Successful exploitation of this issue could allow a remote attacker to execute malicious code on a vulnerable system, resulting in full system compromise.

The vulnerability may also reportedly be exploitable by a local user who passes malicious parameters to the vulnerable component interactively or through another application.

This issue is reported to only affect system that have SSL enabled, such as web servers, but could also affect Windows 2000 Domain Controllers under some circumstances. For Windows Server 2003, PCT must be manually enabled in addition to enabling SSL support to be affected. Reportedly, both PCT 1.0 and SSL 2.0 must be enabled for successful exploitation.

Symantec ManHunt 3.0
As of April 28, 2004, users of Symantec Manhunt 3.0 can update to Security Update 23 to detect attempts to exploit this vulnerability. Click here for more information.

Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released April 13, 2004.

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 April 13, 2004.

Symantec Enterprise Security Manager Network Assessment Module
Symantec Enterprise Security Manager Network Assessment Module detects and reports this vulnerability. Click here for the advisory released January 18, 2006.

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 Datacenter Server SP4
Microsoft Windows 2000 Datacenter Server SP3
Microsoft Windows 2000 Datacenter Server SP2
Microsoft Windows 2000 Datacenter Server SP1
Microsoft Windows 2000 Datacenter 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 Enterprise Server 4.0 SP6a
Microsoft Windows NT Enterprise Server 4.0 SP6
Microsoft Windows NT Enterprise Server 4.0 SP5
Microsoft Windows NT Enterprise Server 4.0 SP4
Microsoft Windows NT Enterprise Server 4.0 SP3
Microsoft Windows NT Enterprise Server 4.0 SP2
Microsoft Windows NT Enterprise Server 4.0 SP1
Microsoft Windows NT Enterprise Server 4.0
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

Recommendations
Permit local access for trusted individuals only. Where possible, use restricted environments and restricted shells.
Local attack vectors are reported to exist for this vulnerability. Do not permit untrusted individuals to have interactive access to the system. This will reduce exposure to privilege escalation attacks via this or other latent vulnerabilities.

Block external access at the network boundary, unless service is required by external parties.
Use multiple layers of network access control to regulate external or untrusted network traffic. This will help to limit exposure to exploitation of this and other latent vulnerabilities. This includes blocking RPC ports such as UDP ports 135-139 and 445 and TCP ports 138-139, 445 and 593.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy network intrusion detection systems to monitor network traffic for anomalous or suspicious activity. This may help in detecting attack attempts or activity that is the result of successful exploitation of this or other latent vulnerabilities.

Disable any services that are not needed.
As a precaution, disable SSL-enabled services if they are not explicitly required. This will help to reduce exposure to this issue.

Microsoft has released fixes to address this issue:


Microsoft Windows 2000 Advanced Server SP4:

Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Advanced Server SP3:
Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Advanced Server SP2:
Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Advanced Server SP1:
Microsoft Windows 2000 Advanced Server :
Microsoft Windows 2000 Datacenter Server SP4:
Microsoft Windows 2000 Datacenter Server SP3:
Microsoft Windows 2000 Datacenter Server SP2:
Microsoft Windows 2000 Datacenter Server SP1:
Microsoft Windows 2000 Datacenter Server :
Microsoft Windows 2000 Professional SP4:
Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Professional SP3:
Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Professional SP2:
Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Professional SP1:
Microsoft Windows 2000 Professional :
Microsoft Windows 2000 Server SP4:
Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Server SP3:
Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Server SP2:
Microsoft Patch Security Update for Windows 2000 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows 2000 Server SP1:
Microsoft Windows 2000 Server :
Microsoft Windows NT Enterprise Server 4.0 SP6a:
Microsoft Patch Security Update for Windows NT Server 4.0 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=67A6F461-D2FC-4AA0-957E-3B8DC44F9D79&displaylang=en

Microsoft Windows NT Enterprise Server 4.0 SP6:
Microsoft Windows NT Enterprise Server 4.0 SP5:
Microsoft Windows NT Enterprise Server 4.0 SP4:
Microsoft Windows NT Enterprise Server 4.0 SP3:
Microsoft Windows NT Enterprise Server 4.0 SP2:
Microsoft Windows NT Enterprise Server 4.0 SP1:
Microsoft Windows NT Enterprise Server 4.0:
Microsoft Windows NT Server 4.0 SP6a:
Microsoft Patch Security Update for Windows NT Server 4.0 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=67A6F461-D2FC-4AA0-957E-3B8DC44F9D79&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 Patch Security Update for Windows NT Server, Terminal Server Edition (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=62CBA527-A827-4777-8641-28092D3AAE4F&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 Patch Security Update for Windows NT Workstation 4.0 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=7F1713FC-F95C-43E5-B825-3CF72C1A0A3E&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 Windows Server 2003 Datacenter Edition 64-bit :
Microsoft Windows Server 2003 Enterprise Edition :
Microsoft Patch Security Update for Windows Server 2003 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=EAB176D0-01CF-453E-AE7E-7495864E8D8C&displaylang=en

Microsoft Windows Server 2003 Enterprise Edition 64-bit :
Microsoft Patch Security Update for Windows Server 2003 64 Bit Edition and Windows XP 64 Bit Edition Version 2003 (
http://www.microsoft.com/downloads/details.aspx?FamilyId=C207D372-E883-44A6-A107-6CD2D29FC6F5&displaylang=en

Microsoft Windows Server 2003 Standard Edition :
Microsoft Patch Security Update for Windows Server 2003 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=EAB176D0-01CF-453E-AE7E-7495864E8D8C&displaylang=en

Microsoft Windows Server 2003 Web Edition :
Microsoft Patch Security Update for Windows Server 2003 (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=EAB176D0-01CF-453E-AE7E-7495864E8D8C&displaylang=en

Microsoft Windows XP 64-bit Edition SP1:
Microsoft Patch Security Update for Windows XP 64 Bit Edition (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=C6B55EF2-D9FE-4DBE-AB7D-73A20C82FF73&displaylang=en

Microsoft Windows XP 64-bit Edition :
Microsoft Windows XP 64-bit Edition Version 2003 SP1:
Microsoft Patch Security Update for Windows Server 2003 64 Bit Edition and Windows XP 64 Bit Edition Version 2003 (
http://www.microsoft.com/downloads/details.aspx?FamilyId=C207D372-E883-44A6-A107-6CD2D29FC6F5&displaylang=en

Microsoft Windows XP 64-bit Edition Version 2003 :
Microsoft Patch Security Update for Windows Server 2003 64 Bit Edition and Windows XP 64 Bit Edition Version 2003 (
http://www.microsoft.com/downloads/details.aspx?FamilyId=C207D372-E883-44A6-A107-6CD2D29FC6F5&displaylang=en

Microsoft Windows XP Home SP1:
Microsoft Patch Security Update for Windows XP (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=3549EA9E-DA3F-43B9-A4F1-AF243B6168F3&displaylang=en

Microsoft Windows XP Home :
Microsoft Patch Security Update for Windows XP (KB835732)
http://www.microsoft.com/downloads/details.aspx?FamilyId=3549EA9E-DA3F-43B9-A4F1-AF243B6168F3&displaylang=en

References
Source: Microsoft Security Bulletin MS04-011
URL: http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx

Source: Microsoft SSL Library Remote Compromise Vulnerability
URL: http://xforce.iss.net/xforce/alerts/id/168

Credits
Discovery is credited to Internet Security Systems.


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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