Some vulnerabilities have been reported in Cisco Firewall Services Module (FWSM), which can be exploited by malicious people to cause a DoS (Denial of Service).
1) Three errors exist in the SunRPC inspection engine while processing certain SunRPC messages. This can be exploited to reload a device via specially crafted SunRPC packets that transit the appliance.
2) An error exists in the processing of certain TCP packets when the device is configured in multi-mode (with virtual firewalls) and accepts Telnet, SSH, or ASDM connections. This can be exploited to reload the device by sending a series of specially crafted TCP packets.
Successful exploitation of this vulnerability requires a complete TCP three-way handshake.
Solution: Update to a fixed version. Please see the vendor's advisory for detailed patch information.
Provided and/or discovered by: Reported by the vendor.
Original Advisory: cisco-sa-20100804-fwsm:
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Subject: Cisco Firewall Services Module Multiple Denial of Service Vulnerabilities
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