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AUSCERT External Security Bulletin Redistribution
ESB-2005.0937 -- SYM05-025
Symantec Dynamic VPN Services: ISAKMP Denial of Service
23 November 2005
AusCERT Security Bulletin Summary
Product: Symantec Enterprise Firewall 8.0
Symantec Gateway Security 5000 Series
Symantec Firewall / VPN Appliance 100, 200 and 200R
Symantec Gateway Security 300 and 400
Operating System: Windows
Impact: Denial of Service
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November 21, 2005
Symantec Dynamic VPN Services: ISAKMP Denial of Service
Remote Access Yes
Local Access No
Authentication Required No
Exploit publicly available No
The NISCC (National Infrastructure Security Co-ordination Centre) a
UK-sponsored inter-departmental agency has identified nearly five-thousand
potential ISAKMP vulnerabilities. Test for these vulnerabilities were
created by the NISCC and distributed to an unspecified number of vendors
While proactively testing our products against these vulnerabilities,
Symantec uncovered a buffer overflow in two out of the five-thousand
tests that can lead to a denial of service of the dynamic VPN services.
Product Model/Platform Version Solution
Symantec Enterprise Firewall Windows 8.0 SEF8.0-20051114-00
Solaris 8.0 SEF8.0-20051114-00
Symantec Gateway Security 5000 Series 3.0 SGS3.0-2005114-02
5400 2.0.1 SGS2.0.1-20051114-00
5310 1.0 SG7004-20051114-00
5200/5300 1.0 SG7004-20051114-00
Symantec Firewall /VPN Appliance 200/200R All Build 1.8F
100 All Build 1.8F
Symantec Gateway Security 400 2.0 Build 1103
300 2.0 Build 1103
Not Affected Product(s)
Product Model Version
Symantec Clientless VPN Gateway 4400 5.0
Association and Key Management Protocol), a standard protocol that
provides the framework for establishing, negotiating, modifying, and
deleting security associations. The ISAKMP service listens on UDP port
500 on all the affected security gateways. Under certain conditions a
malformed ISAKMP packet can potentially cause the ISAKMP service to crash
therefore affecting the ability and stability of dynamic VPN tunnels.
Symantec engineers created patches to correct this issue. The patches
listed above are available via the Symantec Enterprise Support site:
Symantec is not aware of any active attempts against or customers impacted
by this issue. M
As a part of normal best practices, users should keep vendor-supplied
patches for all application software and operating systems up-to-date.
Symantec strongly recommends any affected customers update their product
immediately to protect against these types of threats.
Symantec takes the security and proper functionality of its products
very seriously. As founding members of the Organization for Internet
Safety (OISafety), Symantec follows the principles of responsible
disclosure. Symantec also subscribes to the vulnerability guidelines
outlined by the National Infrastructure Advisory Council (NIAC). Please
contact email@example.com if you feel you have discovered a potential
or actual security issue with a Symantec product. A Symantec Product
Security team member will contact you regarding your submission.
Symantec has developed a Product Vulnerability Handling Process document
outlining the process we follow in addressing suspected vulnerabilities
in our products. We support responsible disclosure of all vulnerability
information in a timely manner to protect Symantec customers and the
security of the Internet as a result of vulnerability. This document is
available from the location provided below.
Symantec strongly recommends using encrypted email for reporting
vulnerability information to firstname.lastname@example.org. The Symantec Product
Security PGP key can be obtained from the location provided below.
Symantec-Product-Vulnerability-Response Symantec Vulnerability Response
Policy Symantec Product Vulnerability Management PGP Key Symantec Product
Vulnerability Management PGP Key
Copyright (c) 2005 by Symantec Corp.
Permission to redistribute this alert electronically is granted as long
as it is not edited in any way unless authorized by Symantec Security
Response. Reprinting the whole or part of this alert in any medium other
than electronically requires permission from email@example.com.
The information in the advisory is believed to be accurate at the time
of publishing based on currently available information. Use of the
information constitutes acceptance for use in an AS IS condition. There
are no warranties with regard to this information. Neither the author
nor the publisher accepts any liability for any direct, indirect, or
consequential loss or damage arising from use of, or reliance on, this
Symantec, Symantec products, Symantec Security Response, and SymSecurity
are registered trademarks of Symantec Corp. and/or affiliated companies
in the United States and other countries. All other registered and
unregistered trademarks represented in this document are the sole property
of their respective companies/owners.
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