Problem description:
The firewall maintains a pointer to layer 4 header information in the event that it needs to send a TCP reset or ICMP error message to discard packets. Due to incorrect handling of IP fragments, this pointer fails to get initialized.
Impact:
An attacker can cause the firewall to crash by sending ICMP IP fragments to or through firewalls which match any reset, reject or unreach actions.
Workaround:
Change any reset, reject or unreach actions to deny. It should be noted that this will result in packets being silently discarded.
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