Some vulnerabilities have been reported in Cisco ASA (Adaptive Security Appliance) 5500 Series, which can be exploited by malicious people to bypass certain security restrictions or cause a DoS (Denial of Service).

1) An error when receiving certain TCP segments while a connection is being terminated can be exploited to make a device unable to accept new TCP connections.

2) Two errors in the Session Initiation Protocol (SIP) inspection feature can be exploited to trigger an appliance reload.

3) An error in the Skinny Client Control Protocol (SCCP) inspection feature can be exploited to trigger an appliance reload.

4) An error in WebVPN can be exploited to trigger an appliance reload via a specially crafted DTLS packet.

5) An error when using the "nailed" option can be exploited to reload an appliance via a specially crafted TCP segment that transits the appliance.

6) An error when parsing Internet Key Exchange (IKE) messages can be exploited to disrupt all IPsec tunnels that terminate on an affected device.

7) An error in the implementation of the NT LAN Manager version 1 (NTLMv1) protocol can be exploited to bypass authentication via a specially crafted username.

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
http://www.cisco.com/warp/public/707/cisco-sa-20100217-asa.shtml

Deep Links
Links available to Secunia VIM customers