Microsoft pptp vpn vulnerabilities Exploits in Action

Signature of the attack:
System CPU utilization at 100% and Memory at 50%.
Applications and command line commands won’t function and give unusual 
errors.
PPTP and other services unresponsive.
Below is a typical Ethereal sniffing session screenshot (on Linux) during this 
attack (you may want to increase the magnification of this document to see 
screenshot more clearly):
IDS can be easily setup to detect these packets. As you can see, 
malformed IP protocol GRE (0x2f) packets are being easily detected.