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UNIRAS Brief - 422/05 - Microsoft ISA Server 2000 denial of service vulnerability



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 422/05 dated 02.06.05  Time: 14:50  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
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Microsoft ISA Server 2000 denial of service vulnerability

Detail
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Microsoft Internet Security and Acceleration Server 2000 (ISA Server) 
is vulnerable to a denial of service when receiving heavy network 
traffic from client computers configured as SecureNAT clients. This 
results in the ISA Firewall service Wspsrv.exe crashing with an access 
violation.




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         Microsoft ISA Server 2000 denial of service vulnerability
                                2 June 2005

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Product:           Microsoft ISA Server 2000 SP2 and prior
Operating System:  Windows
Impact:            Denial of Service
Access:            Remote/Unauthenticated


OVERVIEW:

	Microsoft Internet Security and Acceleration Server 2000 (ISA Server) 
	is vulnerable to a denial of service when receiving heavy network 
	traffic from client computers configured as SecureNAT clients. This 
	results in the ISA Firewall service Wspsrv.exe crashing with an access 
	violation.

	ISA Server 2000 and ISA Server 2000 SP2 are both reported vulnerable 
	to this issue.


IMPACT:

	Client computers may be able to deliberately crash the ISA Firewall 
	service by generating large volumes of traffic.

	Crashing the Wspsrv.exe process may also result in reduced security for 
	the network protected by ISA Firewall, but this has not been confirmed 
	by AusCERT.


MITIGATION:

	A hotfix is now available from Microsoft Product Support Services, 
	currently supporting ISA Server 2000 SP2 only. For more information, 
	see [1].


REFERENCES:

	[1] Microsoft Knowledge Base article 894864
	    http://support.microsoft.com/kb/894864/EN-US/



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For additional information or assistance, please contact the HELP Desk by 
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UNIRAS wishes to acknowledge the contributions of Microsoft for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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