Title: Cisco VPN Client NETBIOS TCP Packet Denial Of Service Vulnerability
Severity: MODERATE
Description:
The Cisco VPN Client is software for communicating securely via VPN (Virtual Private Networks). It is available for a number of platforms, including Microsoft Windows, MacOS X, Solaris and Linux.
Cisco VPN Client is reported to be prone to a denial of service condition upon receipt of NETBIOS TCP packets. It is possible for a remote attacker to exploit this condition to shut down a connection that the client has initiated by sending a NETBIOS packet to port 137 of the host running the client.
Exploitation of this issue will cause the client to crash. An attacker may potentially make a prolonged attack, which will effectively restrict the ability of the user to make a VPN connection using the client.
Affected Products:
- Cisco VPN Client for Windows 2.0.0
- Cisco VPN Client for Windows 3.0.0
References:
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