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CERT Coordination Center

Check Point RDP Bypass Vulnerability

Vulnerability Note VU#310295

Original Release Date: 2001-07-09 | Last Revised: 2003-04-09


Check Point VPN-1/FireWall-1 version 4.0 & 4.1 may allow an intruder to pass traffic through the firewall on port 259.


Firewall-1 and VPN-1 include support for RDP, but do not provide adequate security controls for RDP data. By adding a faked RDP header to typical UDP traffic, any content can be passed to port 259 on any host on either side of the device.


An attacker who exploits this vulnerability can build a tunnel to bypass the firewall and pass traffic to and from arbitrary hosts on either side of the firewall on port 259.


Apply patch from vendor.

Vendor Information

Affected   Unknown   Unaffected

Check Point

Notified:  June 11, 2001 Updated:  July 09, 2001



Vendor Statement

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A



The vulnerability was discovered by Jochen Bauer and Boris Wesslowski of Inside Security GmbH Stuttgart, Germany.

This document was written by Ian A. Finlay.

Other Information

CVE IDs: CVE-2001-1158
CERT Advisory: CA-2001-17
Severity Metric: 51.30
Date Public: 2001-07-09
Date First Published: 2001-07-09
Date Last Updated: 2003-04-09 19:26 UTC
Document Revision: 57

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