Cisco issues three security advisories

A couple of flaws in the IOS software could allow packets to evade inspection and be exploited in a denial of service attack against affected devices.

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More packet inspection problems were found in Cisco PIX and ASA products as well as a privilege escalation vulnerability. A free update is available.

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Accoring to the Cisco advisory, "Multiple vulnerabilities exist in the Cisco Firewall Services Module (FWSM). These vulnerabilities occur in the processing of specific Hypertext Transfer Protocol (HTTP), Secure HTTP (HTTPS), Session Initiation Protocol (SIP), and Simple Network Management Protocol (SNMP) traffic. If verbose logging is enabled for debugging purposes, a vulnerability exists when the FWSM processes packets destined to itself. All of these vulnerabilities may result in a reload of the device."

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