SUMMARY

Advanced IT-Security, a Scandinavian security consultancy, notified Symantec of a potential information leak issue they discovered in the manner in which the web proxy component in the Symantec Enterprise Firewall returned error messages. A remote user connecting to the proxy server can actually perform limited reconnaissance activity against the internal network behind the firewall even though access is restricted by the firewall. By analyzing the unauthorized access error messages returned, the remote user can determine whether the address requested is a valid address or not. In this manner, a limited mapping of the internal network is possible

AFFECTED PRODUCTS

Components Affected
Raptor Firewall 6.5 (Windows NT)
Raptor Firewall 6.5.3 (Solaris)
Symantec Enterprise Firewall 6.5.2 (Windows 2000 and NT)

MITIGATION

Symantec Response
Symantec verified this issue reported by Advanced IT-Security as an issue that Symantec addressed as a collateral problem in an earlier security update for the Symantec Enterprise Firewall. The Symantec Enterprise Firewall is not vulnerable to this concern if patched fully up-to-date. All patches are available for download through the Symantec Enterprise Support Web site

The following security bundles are the latest security hotfixes for the affected products. If you have not applied the appropriate hotfix for this Info Leak issue, the hotfix bundle indicated below is a cumulative hotfix and contains the appropriate fix for this issue as well.
 

Raptor Firewall 6.5.3 for Solaris
Hotfix: SG6503-20020819-00 - httpd nntpd and vpn driver
ftp://ftp.symantec.com/public/updates/security-653-3des.tar
ftp://ftp.symantec.com/public/updates/security-653-des.tar

Symantec Enterprise Firewall 6.5.2 for Windows NT
Hotfix: SG6502-20020819-00 - httpd and vpn.sys
ftp://ftp.symantec.com/public/updates/security-652nt-3des.zip
ftp://ftp.symantec.com/public/updates/security-652nt-des.zip

Symantec Enterprise Firewall 6.5.2 for Windows 2000
Hotfix: SG6502-20020819-00 - httpd and axtvpn.sys
ftp://ftp.symantec.com/public/updates/security-652w2k-3des.zip
ftp://ftp.symantec.com/public/updates/security-652w2k-des.zip

As a best practice, Symantec recommends keeping all operating systems and applications updated with the latest vendor patches. Keeping mission-critical systems updated with all security patches applied reduces risk exposure

ACKNOWLEDGEMENTS

Symantec takes the security and proper functionality of our products very seriously. Symantec appreciates the assistance of Tommy Mikalsen from Advanced IT-Security in identifying this area of concern so we could quickly address it