& for those of us who use PIX's here are the complete advisories http://www.cisco.com/warp/public/707/cisco-sa-20031215-pix.shtml#softwar e (PIX) http://www.cisco.com/warp/public/707/cisco-sa-20031215-fwsm.shtml (FWSM) -----Original Message----- From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx] Sent: 19 December 2003 20:48 To: [ISAserver.org Discussion List] Subject: [isalist] FW: CISCO ALERT - Cisco warns of holes in PIX firewalls http://www.ISAserver.org So much for the miracle of the "hardware" firewall :-) Network World's Cisco News Alert Cisco warns of holes in PIX firewalls By Paul Roberts IDG News Service, 12/16/03 Network equipment maker Cisco is warning customers about security holes in its PIX firewall product and firewall software that runs on the Catalyst 6500 Series and 7600 Series switches. Cisco issued two security advisories on Monday describing vulnerabilities that could allow remote attackers to shut down Cisco firewalls using HTTP or SNMP requests designed to exploit the weaknesses. Certain versions of the PIX firewall can be crashed and restarted in a so-called denial-of-service (DoS) attack when they receive messages using the SNMP version 3 (SNMPv3) protocol, an updated version of SNMP, which allows organizations to monitor the status of network devices. PIX firewalls do not support SNMPv3, Cisco said. An SNMP server must be defined for the Cisco firewall in order for SNMPv3 attack to succeed, Cisco said. Catalyst switches running the Cisco Firewall Services Module (FWSM) are also vulnerable to DoS attacks using SNMPv3, Cisco said. The FWSM is software, based on the PIX Operating System, that allows Cisco customers to use their high-performance Catalyst switches as firewalls. In addition to the SNMPv3 vulnerability, a second buffer overflow vulnerability discovered in the FWSM could allow a malicious hacker using either RADIUS or TACACS+ to crash a Cisco firewall with a user authentication request sent using HTTP, Cisco said. RADIUS and TACACS+ are both client/server protocols that allow remote access servers to communicate with a central authentication server and authorize a remote user's access to a requested network system or service. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 Exchange Server Resource Site: http://www.msexchange.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: spittwood@xxxxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') A full list of partners in Amery-Parkes is available for inspection at all of our offices. Information contained in this e-mail is intended for the use of the addressee only, and is confidential and may be the subject of Legal Professional Privilege. Any dissemination, distribution, copying or use this communication without prior permission of the addressee is strictly prohibited. The contents of an attachment to this email may contain software viruses which could damage your own computer system. Whilst Amery-Parkes has taken every reasonable precaution to minimise this risk, we do not accept liability for any damage which you sustain as a result of software viruses. You should carry out your own virus checks before opening any attachment to this email.