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AUSCERT External Security Bulletin Redistribution
ESB-2004.0536 -- US-CERT Vulnerability Note VU#432097
Novell Bordermanager VPN Service Denial of Service Vulnerability
26 August 2004
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AusCERT Security Bulletin Summary
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Product: Novell BorderManager 3.8 SP1 and prior
Publisher: US-CERT
Operating System: Novell Netware
Impact: Denial of Service
Access: Remote/Unauthenticated
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US-CERT Vulnerability Note VU#432097
Novell Bordermanager VPN Service denial-of-service vulnerability
Overview
A vulnerability exists in the Novell Bordermanager VPN service that
could allow a remote attacker to cause a denial of service.
I. Description
The Novell Bordermanager product includes Virtual Private Network (VPN)
capabilities, including support for the standard Internet Key Exchange
(IKE) protocol. A flaw exists in the way the VPN service handles
certain malformed IKE packets. This flaw creates a remotely exploitable
denial of service vulnerability that could cause an affected device to
crash. The specific nature of the IKE packet malformation exploiting
the vulnerability is unknown.
II. Impact
A remote attacker with the ability to craft malformed IKE packets could
cause an "abnormal ending" (abend) in the IKE.NLM module.
This condition creates a denial of service on the server and causes
clients previously connected to the server to hang.
III. Solution
A patch fixing this vulnerability is available from Novell at the
following URL:
http://support.novell.com/cgi-bin/search/searchtid.cgi?/10093576.htm
Credit
This bulletin is an edited version of US-CERT Vulnerability Note
VU#432097, written by Chad R Dougherty.
Thanks to the Novell product security team for reporting this
vulnerability. This vulnerability was discovered using the Striker
test suite from Rapid7.
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