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UNIRAS ALERT - 29/03 - Microsoft Windows RPC DCOM Vulnerability


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 UNIRAS (UK Govt CERT) ALERT - 29/03 dated 14.10.03  Time: 13:45
 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
 Information about NISCC is available from www.niscc.gov.uk
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Microsoft Windows RPC DCOM Vulnerability


Departmental and organisational security officers should be aware that
fully patched Microsoft Windows 2000/XP systems are vulnerable to a
denial of service using code available on the Internet that exploits
the MS03-039 heap overflow vulnerability. However, there is currently
no indication that this denial of service can be converted into remote
code execution on a fully patched system.
The published exploit can carry out a denial of service across a range 
of versions, levels and language versions of Microsoft Windows 2000 
and XP, and achieves remote code execution on unpatched systems.  
The 'universal' nature of the exploit may assist the development of a 
worm incorporating some of the attack techniques.


NISCC strongly recommends that all RPC calls are blocked at the
organisational perimeter. Destination TCP/UDP ports 135-139, 445 and
593 should be blocked both inbound and outbound.

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For additional information or assistance, please contact the HELP Desk by 
telephone or Not Protectively Marked information may be sent via e-mail to:

Office Hours:
Mon - Fri: 08:30 - 17:00 Hrs
Tel: +44 (0) 20 7821 1330 Ext 4511
Fax: +44 (0) 20 7821 1686

Outside of Office Hours:
On Call Duty Officer:
Tel: +44 (0) 20 7821 1330 and follow the prompts.

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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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