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Microsoft Windows DHCP Client Service Remote Code Execution Vulnerability

Risk
High

Date Discovered
7/11/2006 12:00:00 AM

Description
Microsoft Windows DHCP Client service is susceptible to a remote code-execution vulnerability. This issue is due to a failure of the service to properly bounds check user-supplied input prior to copying it to an insufficiently-sized memory buffer. This vulnerability allows remote attackers to execute arbitrary machine code with SYSTEM-level privileges on affected computers. This facilitates the complete compromise of affected computers.

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 July 12, 2006.

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 July 25, 2006.

Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released July 19, 2006.

Technologies Affected
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Advanced Server SP1
Microsoft Windows 2000 Advanced Server SP2
Microsoft Windows 2000 Advanced Server SP3
Microsoft Windows 2000 Advanced Server SP4
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Datacenter Server SP1
Microsoft Windows 2000 Datacenter Server SP2
Microsoft Windows 2000 Datacenter Server SP3
Microsoft Windows 2000 Datacenter Server SP4
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Professional SP1
Microsoft Windows 2000 Professional SP2
Microsoft Windows 2000 Professional SP3
Microsoft Windows 2000 Professional SP4
Microsoft Windows 2000 Server
Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Server SP3
Microsoft Windows 2000 Server SP4
Microsoft Windows XP
Microsoft Windows XP Home
Microsoft Windows XP Home SP1
Microsoft Windows XP Home SP2
Microsoft Windows XP Professional
Microsoft Windows XP Professional SP1
Microsoft Windows XP Professional SP2
Microsoft Windows XP Professional x64 Edition
Microsoft Windows XP Tablet PC Edition
Microsoft Windows XP Media Center Edition
Microsoft Windows XP Media Center Edition SP1
Microsoft Windows XP Media Center Edition SP2
Microsoft Windows XP Tablet PC Edition SP1
Microsoft Windows XP Tablet PC Edition SP2
Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Datacenter Edition 64-bit
Microsoft Windows Server 2003 Datacenter Edition 64-bit SP1
Microsoft Windows Server 2003 Datacenter Edition SP1
Microsoft Windows Server 2003 Datacenter x64 Edition
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Enterprise Edition 64-bit
Microsoft Windows Server 2003 Enterprise Edition 64-bit SP1
Microsoft Windows Server 2003 Enterprise Edition SP1
Microsoft Windows Server 2003 Enterprise x64 Edition
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Standard Edition SP1
Microsoft Windows Server 2003 Standard x64 Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows Server 2003 Web Edition SP1

Recommendations
Block external access at the network boundary, unless external parties require service.
Block DHCP-related traffic at the network boundary. Ensure that only trusted hosts and networks can send DHCP traffic to vulnerable computers.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Network intrusion detection systems should be deployed to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.
Implement multiple redundant layers of security.
An attacker's ability to exploit this vulnerability to execute arbitrary code may be hindered through the use of various memory protection schemes. Where possible, implement the use of non-executable and randomly mapped memory segments.


Microsoft has released an advisory along with fixes to address this issue.
Microsoft Windows 2000 Advanced Server SP4:

Microsoft Hotfix Security Update for Windows 2000 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=7a04fae4-6914-4ffa-b0ec-61b912d47873

Microsoft Windows 2000 Datacenter Server SP4:
Microsoft Hotfix Security Update for Windows 2000 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=7a04fae4-6914-4ffa-b0ec-61b912d47873

Microsoft Windows 2000 Professional SP4:
Microsoft Hotfix Security Update for Windows 2000 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=7a04fae4-6914-4ffa-b0ec-61b912d47873

Microsoft Windows 2000 Server SP4:
Microsoft Hotfix Security Update for Windows 2000 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=7a04fae4-6914-4ffa-b0ec-61b912d47873

Microsoft Windows XP Home SP1:
Microsoft Hotfix Security Update for Windows XP (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=bf08cc28-b359-4b27-99b2-342f832cdecc

Microsoft Windows XP Home SP2:
Microsoft Hotfix Security Update for Windows XP (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=bf08cc28-b359-4b27-99b2-342f832cdecc

Microsoft Windows XP Media Center Edition SP1:
Microsoft Hotfix Security Update for Windows XP (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=bf08cc28-b359-4b27-99b2-342f832cdecc

Microsoft Windows XP Media Center Edition SP2:
Microsoft Hotfix Security Update for Windows XP (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=bf08cc28-b359-4b27-99b2-342f832cdecc

Microsoft Windows XP Professional SP1:
Microsoft Hotfix Security Update for Windows XP (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=bf08cc28-b359-4b27-99b2-342f832cdecc

Microsoft Windows XP Professional SP2:
Microsoft Hotfix Security Update for Windows XP (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=bf08cc28-b359-4b27-99b2-342f832cdecc

Microsoft Windows XP Tablet PC Edition SP1:
Microsoft Hotfix Security Update for Windows XP (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=bf08cc28-b359-4b27-99b2-342f832cdecc

Microsoft Windows XP Tablet PC Edition SP2:
Microsoft Hotfix Security Update for Windows XP (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=bf08cc28-b359-4b27-99b2-342f832cdecc

Microsoft Windows XP Professional x64 Edition :
Microsoft Hotfix Security Update for Windows XP x64 Edition (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=49b0da03-73a7-462a-9dc2-2eb5405e2505

Microsoft Windows Server 2003 Datacenter Edition :
Microsoft Hotfix Security Update for Windows Server 2003 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=2978c3d2-59e3-4dd4-8323-b1b2f9dfa7a5

Microsoft Windows Server 2003 Datacenter Edition SP1:
Microsoft Hotfix Security Update for Windows Server 2003 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=2978c3d2-59e3-4dd4-8323-b1b2f9dfa7a5

Microsoft Windows Server 2003 Enterprise Edition :
Microsoft Hotfix Security Update for Windows Server 2003 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=2978c3d2-59e3-4dd4-8323-b1b2f9dfa7a5

Microsoft Windows Server 2003 Enterprise Edition SP1:
Microsoft Hotfix Security Update for Windows Server 2003 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=2978c3d2-59e3-4dd4-8323-b1b2f9dfa7a5

Microsoft Windows Server 2003 Standard Edition :
Microsoft Hotfix Security Update for Windows Server 2003 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=2978c3d2-59e3-4dd4-8323-b1b2f9dfa7a5

Microsoft Windows Server 2003 Standard Edition SP1:
Microsoft Hotfix Security Update for Windows Server 2003 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=2978c3d2-59e3-4dd4-8323-b1b2f9dfa7a5

Microsoft Windows Server 2003 Web Edition :
Microsoft Hotfix Security Update for Windows Server 2003 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=2978c3d2-59e3-4dd4-8323-b1b2f9dfa7a5

Microsoft Windows Server 2003 Web Edition SP1:
Microsoft Hotfix Security Update for Windows Server 2003 (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=2978c3d2-59e3-4dd4-8323-b1b2f9dfa7a5

Microsoft Windows Server 2003 Datacenter Edition 64-bit :
Microsoft Hotfix Security Update for Windows Server 2003 for Itanium-based Systems (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=01e7bbbd-dfb6-4524-aa35-39323b210aa4

Microsoft Windows Server 2003 Datacenter Edition 64-bit SP1:
Microsoft Hotfix Security Update for Windows Server 2003 for Itanium-based Systems (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=01e7bbbd-dfb6-4524-aa35-39323b210aa4

Microsoft Windows Server 2003 Enterprise Edition 64-bit :
Microsoft Hotfix Security Update for Windows Server 2003 for Itanium-based Systems (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=01e7bbbd-dfb6-4524-aa35-39323b210aa4

Microsoft Windows Server 2003 Enterprise Edition 64-bit SP1:
Microsoft Hotfix Security Update for Windows Server 2003 for Itanium-based Systems (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=01e7bbbd-dfb6-4524-aa35-39323b210aa4

Microsoft Windows Server 2003 Datacenter x64 Edition :
Microsoft Hotfix Security Update for Windows Server 2003 x64 Edition (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=d68730a7-bb7c-477a-a2a4-991629fc1402

Microsoft Windows Server 2003 Enterprise x64 Edition :
Microsoft Hotfix Security Update for Windows Server 2003 x64 Edition (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=d68730a7-bb7c-477a-a2a4-991629fc1402

Microsoft Windows Server 2003 Standard x64 Edition :
Microsoft Hotfix Security Update for Windows Server 2003 x64 Edition (KB914388)
http://www.microsoft.com/downloads/details.aspx?familyid=d68730a7-bb7c-477a-a2a4-991629fc1402

References
Source: Microsoft Security Bulletin MS06-036
URL: http://www.microsoft.com/technet/security/Bulletin/MS06-036.mspx

Source: Microsoft Windows Update
URL: http://www.microsoft.com/Windowsupdate

Source: Windows XP Homepage
URL: http://www.microsoft.com/windowsxp/default.asp

Credits
Mariano Nuñez Di Croce of Cybsec Security Systems reported this issue to the vendor.


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