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             AUSCERT External Security Bulletin Redistribution

                        ESB-2004.0538 -- SYM04-012
                 Symantec IPsec/ISAKMP VPN Buffer Overflow
                              27 August 2004

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        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

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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. 

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