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Cisco VPN Concentrator Group Name Enumeration

Medium

Synopsis

The remote host may give an attacker information useful for future attacks.

Description

The remote VPN concentrator is subject to an information disclosure flaw. An attacker connecting in Agressive mode can determine whether a remote Cisco group is defined. This can allow the attacker the ability to garner information useful in future brute force attacks.

Solution

http://www.cisco.com/univercd/cc/td/doc/product/vpn/vpn3000/4_7/471con3k.htm