source: http://www.securityfocus.com/bid/7423/info
When a VPN is configured to use a pre-shared master secret and a client attempts to negotiate keys in aggressive mode, a hash of the secret is transmitted across the network in clear-text. This may result in the hash being leaked to eavesdroppers or malicious clients. An offline brute-force attack on this hash may then be performed to obtain the clear-text secret.
http://www.exploit-db.com/sploits/22532.tar.gz
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