Windows NT 4.0 PPTP Vulnerable to Denial of Service Attack

Reported February 13, 2001, by Microsoft.

VERSIONS AFFECTED

Microsoft Windows NT 4.0 PPTP

DESCRIPTION

A Denial of Service (DoS) attack against Windows NT Server 4.0 installations running PPTP has been discovered. A flaw in the PPTP code lets a specific data packet cause a leak in the kernel memory. The server must receive a number of the special packets before there is a leak.

VENDOR RESPONSE

Microsoft has released a security bulletin, MS01-009.

CREDIT
Discovered by Kirk Corey.

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