Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2004.0538 -- SYM04-012
Symantec IPsec/ISAKMP VPN Buffer Overflow
27 August 2004
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Symantec Enterprise Firewall 8.0
Symantec Enterprise Firewall 7.0.x
Symantec Gateway Security 2.0 - 5400 Series
Symantec Gateway Security 1.0 - 5300 Series
Symantec VelociRaptor 1.5
Publisher: Symantec
Operating System: Solaris
Windows
Platform: SPARC
IA-32
Symantec Appliances
Impact: Execute Arbitrary Code/Commands
Denial of Service
Access: Remote/Unauthenticated
CVE Names: CAN-2004-0369
Ref: ESB-2004.0535
- --------------------------BEGIN INCLUDED TEXT--------------------
SYM04-012
August 26, 2004
Symantec IPsec/ISAKMP VPN Buffer Overflow
Revision History
None
Risk Impact
High
Overview
Symantec resolved a Denial of Service (DoS) and potential compromise
vulnerability reported by ISS X-Force. The vulnerability was identified in the
Entrust module responsible for handling ISAKMP negotiations that is used in
some Symantec gateway products. Under certain conditions, the VPN component
terminates abruptly impacting the availability of dynamic VPN services.
A specifically crafted attack could potentially lead to further compromise of
the VPN server.
NOTE: This issue does not affect gateways that only use static VPN tunnels or
that have no dynamic VPN tunnels defined.
Affected Components
Symantec Enterprise Firewall 8.0 (Windows and Solaris)
Symantec Enterprise Firewall 7.0.x (Windows and Solaris)
Symantec VelociRaptor 1.5
Symantec Gateway Security 1.0 - 5300 Series
Symantec Gateway Security 2.0 - 5400 Series
Details
ISS X-Force notified Symantec of a vulnerability they discovered in the Entrust
module running on some of Symantec's gateway products. The module, which
implements the IKE key exchange protocol, was not properly validating incoming
ISAKMP packets.
ISAKMP is a standard protocol used to negotiate dynamic VPN tunnels. By sending
sufficiently malformed ISAKMP packets, an attacker could cause a DoS condition
in the affected VPN component. Or, if specifically crafted, the malformed
ISAKMP packets could potentially lead to further possible compromise of the
VPN server.
Symantec Response
Symantec confirmed the vulnerable module and coordinated extensively with
Entrust to finalize and thoroughly test a fix for the Entrust module impacting
Symantec's affected products.
Symantec has released a hotfix to address this issue for affected Symantec
gateway products. Symantec strongly recommends customers apply the appropriate
hotfix for their affected product models/versions immediately to protect against
this type of threat.
Mitigation
This issue does not affect gateways that only use static VPN tunnels or that
have no dynamic VPN tunnels defined. Even when ISAKMPd is running (always by
default), if no dynamic VPN tunnels are defined, ISAKMP traffic is filtered
before it gets to the ISAKMPd module. Therefore any gateway that is not being
used as a VPN server is not affected by this problem.
Symantec recommends that customers who are NOT currently using their Symantec
gateway product as a VPN server apply this hotfix during normal maintenance
cycles in the event they configure their gateway product as a VPN server in the
future.
Product specific hotfixes are available via the Symantec Enterprise Support
site http://www.symantec.com/techsupp.
Symantec is not aware of any active attempts against or organizations impacted
by this issue.
CVE
The Common Vulnerabilities and Exposures (CVE) initiative has assigned
Candidate CAN-2004-0369 to the ISS X-Force reported issue. This is a candidate
for inclusion in the CVE list (http://cve.mitre.org), which standardizes names
for security problems.
Credit:
Symantec appreciates the actions of the X-Force research team in identifying
this issue to Symantec and their cooperation and coordination while Symantec
worked with Entrust to resolve all issues.
Symantec Product Security Contact
Symantec takes the security and proper functionality of its products very
seriously. As founding members in the Organization for Internet Safety,
Symantec follows the process of responsible disclosure. Symantec also subscribes
to the vulnerability guidelines outlined by the National Infrastructure Advisory
Council (NIAC). Please contact secure@symantec.com if you feel you have
discovered a potential or actual security issue with a Symantec product.
Symantec strongly recommends using encrypted email for reporting vulnerability
information to secure@symantec.com. The Symantec Product Security PGP key can be
obtained here.
Copyright (c) 2004 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 symsecurity@symantec.com.
Disclaimer
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 information.
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.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iQCVAwUBQS6nZih9+71yA2DNAQIcAQQAiHuY8JHiksBLHrpu8RR26n6raCHeccyY
VyHO/0Fleumzp2TnO7U1Y4RxcRksGqsd8gVPtwpJy0ill2HuOx7jpjvfUD70aji1
zYRQ9/EnhYb55dMygbqiL2VgSYmUZyNdqXFZdlZvcUm2Z+px2StPS5qabQWr/vnt
G4v7Vm+AVVU=
=AsDh
-----END PGP SIGNATURE-----