var-200003-0048
Vulnerability from variot

Firewall-1 3.0 and 4.0 leaks packets with private IP address information, which could allow remote attackers to determine the real IP address of the host that is making the connection. A vulnerability exists in which Checkpoint Firewall-1 will expose internal addresses to machines outside the network. Under seemingly normal load conditions, according to the poster of this vulnerability, 40% CPU utilization with 200+ active connections, Firewall-1 will attempt to establish connections utilizing the internal address. As this address is either non-routable, or internal, a retransmission will occur; this packet will have the correct address rewritten, but will use the same source port. This may be particularly useful to attackers conducting client side attacks. These problems have been seen on both NT and Solaris versions of FW-1, although the poster indicated that not enough data was available to directly state the Solaris version was vulnerable in the same ways, or to the same degrees

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