Microsoft pptp vpn vulnerabilities Exploits in Action

Description of any exploit Variants:
See PPTP ATTACK numbers 1 and 3 which are also DoS related 
vulnerabilities related to the system not being able to handle malformed packets 
and consuming resources.
Protocol Description:
PPTP GRE is the vulnerable protocol, please see the detailed description 
of this protocol in the earlier and later sections of this document under GRE.
How the Exploit Works:
By using ipsend to send a number of malformed GRE packets to the 
target system, the PPTP server is unable to properly handle these packets and 
causes the system to become unresponsive.
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