Some vulnerabilities have been reported in Cisco ASA (Adaptive Security Appliance) 5500 Series, 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 UDP SunRPC packets that transit the appliance.
2) Three errors exist in the processing of certain TLS packets and can be exploited to reload the device by sending a series of specially crafted TLS packets.
Successful exploitation of this vulnerability requires that the device is configured for SSL VPN, TLS Proxy for Encrypted Voice Inspection, or configured to accept ASDM management connections.
3) An error in the Session Initiation Protocol (SIP) inspection feature can be exploited to trigger an appliance reload via a specially crafted SIP packet that transits the appliance via TCP or UDP port 5060.
4) An error when parsing Internet Key Exchange (IKE) messages can be exploited to trigger an appliance reload via specially crafted packets sent to UDP ports 500 or 4500.
Successful exploitation of this vulnerability requires that the device is configured for IPsec remote access or site-to-site VPNs
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-asa:
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Subject: Cisco ASA 5500 Series Multiple Denial of Service Vulnerabilities
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