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Category:   Application (Generic)  >   PoPToP Vendors:   PoPToP Development Team
PoPToP Sequence and Dequeing Bugs Let Remote Users Deny Service
SecurityTracker Alert ID:  1018064
SecurityTracker URL:
CVE Reference:   CVE-2007-0244   (Links to External Site)
Date:  May 15 2007
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.3.4
Description:   A vulnerability was reported in PoPToP (pptpd). A remote user can cause denial of service conditions.

A remote user can send specially crafted data to tear down PPTP connections. GRE packets with certain out-of-order sequence numbers and other GRE packets can trigger this flaw.

The vulnerability resides in 'pptpgre.c'.

Impact:   A remote user can disable PPTP connections.
Solution:   The vendor has issued a fixed version (1.3.4).

The pptpd advisory is available at:

Vendor URL: (Links to External Site)
Cause:   State error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   None.

 Source Message Contents

Date:  Tue, 15 May 2007 15:11:06 -0400
Subject:  pptpd


pptpgre.c in PoPToP Point to Point Tunneling Server (pptpd) before 1.3.4 allows remote 
attackers to cause a denial of service (PPTP connection tear-down) via (1) GRE packets 
with out-of-order sequence numbers or (2) certain GRE packets that are processed using 
a wrong pointer and improperly dequeued.

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