REF: AI-SEC Security Advisories <advisories@ai-sec.dk> 10/14/2002 02:10 PM Please respond to advisories Advanced IT-Security Advisory #02-10-2002 http://www.ai-sec.dk/ Issue: ====== Symantec Enterprise Firewall Secure Webserver info leak Problemdescription: =================== There exists a problem in Simple, secure webserver 1.1 which is shipped with Raptor Firewall 6.5 (among others), in which an attacker can connect to the proxyserver from the outside, and issue a CONNECT to IP-addresses on the inside interface, and thereby determine if there are hosts present or not by inspecting the errormessage. This problem lets an attacker map out the entire topology of a client from the outside. Symantec has addressed this issue as a collateral problem in an earlier security update for the Symantec Enterprise Firewall. The Symantec Enterprise Firewall is not vulnerable to this concern ifpatched fully up-to-date. --------------------snip-------------------------------- October 13, 2002 Symantec Enterprise Firewall Secure Webserver info leak Risk Low Overview 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. Products/Versions Raptor Firewall 6.5 (Windows NT) Raptor Firewall V6.5.3 (Solaris) Symantec Enterprise Firewall 6.5.2 (Windows 2000 and NT) 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 site http://www.symantec.com/techsupp. 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. Credit 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. Anyone with information on security issues with Symantec products should contact symsecurity@symantec.com. The Sym Security PGP key can be downloaded from http://securityresponse.symantec.com/avcenter/security/publickey/SymSecurity.asc . This advisory is available at http://securityresponse.symantec.com/avcenter/security/Content/2002.10.11a.html Copyright (c) 2002 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 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 printing 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. ----------------------------------------------------------------------------------------------
