bugtraq - Re: PoPToP PPTP server remotely exploitable buffer overflow

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Message-ID: <16021.39673.135783.341881@saint.heaven.net>
Date: Thu, 10 Apr 2003 12:25:29 -0400
From: "Dick St.Peters" <stpeters@...Heaven.com>
To: Timo Sirainen <tss@....fi>
Subject: Re: PoPToP PPTP server remotely exploitable buffer overflow


Timo Sirainen writes:
> Versions older than 1.1.4-b3 and 1.1.3-20030409 affected. This seems to be
> exploitable only with Linux.
 ...
> problem
> -------
 ...
> 
> 	if (length > PPTP_MAX_CTRL_PCKT_SIZE) {
> 	  // abort
> 	}

Version 1.1.3 does not have this vulnerability.  My copy of 1.1.3
ctrlpacket.c (dated Feb 11 2002) reads

    if (length <= 0 || length > PPTP_MAX_CTRL_PCKT_SIZE) {

My copies of versions 1.0.1 and 1.1.2 do have the vulerability.

--
Dick St.Peters, stpeters@...Heaven.com