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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


        AusCERT Security Bulletin Summary

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

	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:


	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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