AusCERT - ESB-2005.0279 -- Windows Server 2003 Two Local Denial of Service Vulnerabilities

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ESB-2005.0279 -- Windows Server 2003 Two Local Denial of Service Vulnerabilities
Date: 06 April 2005

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             AUSCERT External Security Bulletin Redistribution

         ESB-2005.0279 -- Windows Server 2003 Two Local Denial of
                          Service Vulnerabilities
                               6 April 2005

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        AusCERT Security Bulletin Summary
        ---------------------------------

Operating System:  Microsoft Windows Server 2003
Impact:            Denial of Service
Access:            Existing Account

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PROBLEM:  

	Windows Server 2003 prior to Service Pack 1 has two denial of service 
	vulnerabilties by which authenticated local users, and in particular 
	Terminal Services users can crash the server.

	1. Terminal Services Printing Denial of Service

	   A Terminal Services user can cause the system to crash, resulting in 
	   a "STOP 0x0000008E" blue screen error. This may be exploited by 
	   opening a Microsoft Word attachment in Outlook then printing it to 
	   a network printer.

	   The vulnerability is triggered when the Win32k.sys driver tries to 
	   access an invalid colour adjustment object passed to it by the 
	   printer driver.

	2. SMB Redirector Denial of Service

	   When a SMB browser announcement frame is wrongly processed by the 
	   SMB redirector, it may attempt to execute code that is paged out 
	   and unavailable, resulting in a "STOP 0x000000D1" blue screen error. 

	   A local user can exploit this for example by retrieving large files
	   from a network share when the system is under heavy load, 
	   potentially causing the system to crash.


MITIGATION: 

	These vulnerabilities are fixed in Windows Server 2003 Service Pack 1.


REFERENCES: 

	[1] Terminal Services Printing DoS: Knowledge Base article 829422
	    http://support.microsoft.com/kb/829422/

	[2] SMB Redirector DoS: Knowledge Base article 890554
	    http://support.microsoft.com/kb/890554/

	[3] Secunia Advisory SA14808
	    http://secunia.com/advisories/14808/


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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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