Vulnerability Note VU#992585

Check Point VPN-1 information disclosure vulnerability

Overview

The Check Point VPN-1 firewall contains an information disclosure vulnerability that may allow an authenticated attacker to access data that they are not authorized to access.

I. Description

The Check Point VPN-1 is an application layer firewall that supports remote and site-to-site virtual private networks (VPN).

From Check Point Solution ID sk34579

This issue occurs in the following scenario:
Remote Access Client (C) connects to a gateway (A). A site-to-site VPN tunnel exists between gateways (A) and (B). If the Remote Access Client (C) has an IP address which is also defined in the encryption domain of gateway (B), collisions occur: new connections meant for the afore-mentioned IP address in the encryption domain of gateway (B) would be incorrectly transferred to the Remote Access Client (C). Existing connections are not affected.

II. Impact

A remote, authenticated attacker may be able to intercept data that they are not authorized to access.

III. Solution

Upgrade

Check Point has released an update to address this vulnerability. Administrators should see Check Point Solution ID sk34579 for information about how to obtain fixed software.

Restrict access to internal network applications

Using application based access controls and encryption will mitigate this vulnerability by preventing a remote attacker from decrypting or accessing any data received from exploiting this vulnerability.

Systems Affected

Vendor	Status	Date Updated
Check Point Software Technologies	Vulnerable	18-Mar-2008

References

https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk34579&js_peid=P-114a7ba5fd7-10001&partition=null&product=VPN-1
http://www.puresecurity.com.au/files/PureSecurity%20VPN-1%20DoS_Spoofing%20Attack%20against%20VPN%20tunnels.pdf

Credit

Thanks to Robert Mitchell of Pursecurity and Check Point for information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

Date Public	03/18/2008
Date First Published	03/18/2008 01:07:16 PM
Date Last Updated	03/18/2008
CERT Advisory
CVE Name
US-CERT Technical Alerts
Metric	2.36
Document Revision	30