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Microsoft Windows Workstation Service Remote Buffer Overflow Vulnerability

Risk
High

Date Discovered
11-11-2003

Description
It has been reported that Microsoft Windows Workstation (WKSSVC.DLL) service is prone to a vulnerability that may allow a remote attacker to gain unauthorized access to a vulnerable host. The problem is in the handling of requests by the Workstation Service. The Workstation Service does not properly check bounds on remote data therefore making it possible to overwrite sensitive regions of system memory.

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 November 11, 2003.

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 August 25, 2005.

Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released November 12, 2003.

Symantec ManHunt 3.0
Users of Symantec Manhunt 3.0 can update to the latest Security Update to detect attempts to exploit this vulnerability. Click here for more information.

Symantec Enterprise Firewall 7.0.x and Symantec VelociRaptor 1.5
By default, Symantec's full application inspection firewall technology protects against the Workstation Service Remote Buffer Overflow vulnerability. Microsoft NT operating systems are not affected by the vulnerability. For Windows 2000 based firewalls, unique initial and ongoing system hardening protects the firewall operating system itself, which includes disabling the Microsoft Messenger Service.

Symantec Client Firewall
An update for Symantec Client Firewall to detect attempts to exploit this vulnerability was released on November 13, 2003. Symantec Client Firewall users should run LiveUpdate to ensure protection against this threat.

Symantec Client Security
An update for Symantec Client Security to detect attempts to exploit this vulnerability was released on November 13, 2003. Symantec Client Security users should run LiveUpdate to ensure protection against this threat.

Symantec Gateway Security 1.0
An update for Symantec Gateway Security to detect attempts to exploit this vulnerability was released on November 13, 2003. Symantec Gateway Security users should run LiveUpdate to ensure protection against this threat.
Symantec's full application inspection firewall:
By default, Symantec's full application inspection firewall technology protects against the Workstation Service Remote Buffer Overflow vulnerability.

Symantec Gateway Security 2.0
An update for Symantec Gateway Security to detect attempts to exploit this vulnerability was released on November 13, 2003. Symantec Gateway Security users should run LiveUpdate to ensure protection against this threat.
Symantec's full application inspection firewall:
By default, Symantec's full application inspection firewall technology protects against the Workstation Service Remote Buffer Overflow vulnerability.

Symantec Host IDS 4.1
An update for Symantec Host IDS 4.1 to detect attempts to exploit this vulnerability was released on November 14, 2003. Symantec Host IDS users can run LiveUpdate or download the latest Security Update here to ensure protection against this threat.

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 XP 64-bit Edition SP1
Microsoft Windows XP 64-bit Edition
Microsoft Windows XP Home SP1
Microsoft Windows XP Home
Microsoft Windows XP Media Center Edition
Microsoft Windows XP Professional SP1
Microsoft Windows XP Professional

Recommendations
Block external access at the network boundary, unless service is required by external parties.
Filter network traffic of questionable integrity at network boundaries. Use ingress and egress filtering to block the entry and exit of prohibited traffic.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Use network intrusion detection systems to monitor networks for anomalous activity and report attempted attacks against network resources.

Disable any services that are not needed.
Systems not requiring the ability of remote users to execute commands should disable remote procedure call (RPC) where possible.

Microsoft has released security advisory MS03-049 to address this issue.
Microsoft Windows 2000 Advanced Server SP4:

Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Advanced Server SP3:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Advanced Server SP2:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Advanced Server SP1:
Microsoft Windows 2000 Advanced Server :
Microsoft Windows 2000 Datacenter Server SP4:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Datacenter Server SP3:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Datacenter Server SP2:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Datacenter Server SP1:
Microsoft Windows 2000 Datacenter Server :
Microsoft Windows 2000 Professional SP4:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Professional SP3:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Professional SP2:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Professional SP1:
Microsoft Windows 2000 Professional :
Microsoft Windows 2000 Server SP4:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Server SP3:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Server SP2:
Microsoft Patch Windows2000-KB828749-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2467FE46-D167-479C-9638-D4D79483F261&displaylang=en

Microsoft Windows 2000 Server SP1:
Microsoft Windows 2000 Server :
Microsoft Windows XP 64-bit Edition SP1:
Microsoft Patch WindowsXP-KB828035-ia64-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2BE95254-4C65-4CA5-80A5-55FDF5AA2296&displaylang=en

Microsoft Windows XP 64-bit Edition :
Microsoft Patch WindowsXP-KB828035-ia64-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=2BE95254-4C65-4CA5-80A5-55FDF5AA2296&displaylang=en

Microsoft Windows XP Home SP1:
Microsoft Patch WindowsXP-KB828035-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=F02DA309-4B0A-4438-A0B9-5B67414C3833&displaylang=en

Microsoft Windows XP Home :
Microsoft Patch WindowsXP-KB828035-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=F02DA309-4B0A-4438-A0B9-5B67414C3833&displaylang=en

Microsoft Windows XP Media Center Edition :
Microsoft Patch WindowsXP-KB828035-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=F02DA309-4B0A-4438-A0B9-5B67414C3833&displaylang=en

Microsoft Windows XP Professional SP1:
Microsoft Patch WindowsXP-KB828035-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=F02DA309-4B0A-4438-A0B9-5B67414C3833&displaylang=en

Microsoft Windows XP Professional :
Microsoft Patch WindowsXP-KB828035-x86-ENU.exe
http://www.microsoft.com/downloads/details.aspx?FamilyId=F02DA309-4B0A-4438-A0B9-5B67414C3833&displaylang=en

References
Source: CERT Advisory CA-2003-28 Buffer Overflow in Windows Workstation Service
URL: http://www.cert.org/advisories/CA-2003-28.html

Source: Microsoft Security Bulletin MS03-049
URL: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS03-049.asp

Source: Windows Workstation Service Remote Buffer Overflow
URL: http://www.eeye.com/html/Research/Advisories/AD20031111.html

Credits
Vulnerability discovery credited to eEye Digital Security.


Copyright (c) 2003 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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