Software Engineering Institute

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.

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

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.