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TITLE:
Lotus Domino Malformed vCal Processing Denial of Service

SECUNIA ADVISORY ID:
SA20855

VERIFY ADVISORY:
http://secunia.com/advisories/20855/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
IBM Lotus Domino 6.x
http://secunia.com/product/720/

DESCRIPTION:
Ollie Whitehouse has reported a vulnerability in Lotus Domino, which
can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error in the message routing
functionality (nrouter.exe) when processing meeting requests (vCal)
and can be exploited by sending a specially crafted meeting request.

Successful exploitation consumes 100% CPU resources and prevents
delivery of new mail as long as the malicious message is in the
message queue.

SOLUTION:
Update to version 6.5.4 FP1, 6.5.5, or 7.0.

PROVIDED AND/OR DISCOVERED BY:
Ollie Whitehouse, Symantec.

ORIGINAL ADVISORY:
IBM:
http://www-1.ibm.com/support/docview.wss?rs=463&uid=swg21211952

Symantec:
http://www.symantec.com/enterprise/research/SYMSA-2006-006.txt

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