Viktor Steinmann has reported a weakness in Check Point VPN-1 SecureClient, which potentially can be exploited by malicious users to bypass certain security restrictions.

The weakness is caused due to SecureClient relying on the local copy of the "local.scv" file downloaded from the policy server to perform client integrity checks before allowing the client to connect to the internal networks via VPN. This check may be bypassed by users with write-access to the file by continuously replacing it with a modified copy.

This weakness can potentially allow the SCV (Secure Configuration Verification) feature of the product to be bypassed, which allow client systems that are not compliant to the organisation's security policies to connect to the internal networks.

Solution
Do not rely on the SCV as the only means of ensuring that client systems are configured according to the security policy.

Provided and/or discovered by
Viktor Steinmann

Original Advisory
http://lists.grok.org.uk/pipermail/full-disclosure/2005-December/039634.html

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