Title: Checkpoint Firewall-1 Valid Username Vulnerability
Severity: MODERATE
Description:
Checkpoint Firewall-1 is a popular firewall package available from Checkpoint Software Technologies. A vulnerability exists in Firewall-1 whereby an attacker can determine a valid username by the response given by the firewall to authentication requests (port 259 on the firewall) from a remote client.
Upon connecting to the firewall, the attacker enters a username and password. If the username and password are invalid, the firewall will respond with "<username> not found". If the username is valid, and the password is invalid, the firewall will respond with "Access denied by Firewall-1 authentication".
Upon successfully determining a valid username, a remote attacker could then attempt a brute force or password grinding attack to determine the password for the valid username. If successful, an attacker could then gain access to the firewall based on that user's privileges.
Affected Products:
- Check Point Software Firewall-1 3.0.0
- Check Point Software Firewall-1 4.0.0
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