Configure Packet Based Attack Protection
Table of Contents
Configure Packet Based Attack Protection
To enhance security for a zone, Packet-Based Attack Protection allows you to
specify whether the firewall drops IP, IPv6, TCP, ICMP, or ICMPv6 packets that have
certain characteristics or strips certain options from the packets.
For example, you can drop TCP SYN and SYN-ACK packets that contain data in the
payload during a TCP three-way handshake. A Zone Protection profile by default is
set to drop SYN and SYN-ACK packets with data (you must apply the profile to the
zone).
The TCP Fast Open option (RFC
7413) preserves the speed of a connection setup by including data in the
payload of SYN and SYN-ACK packets. A Zone Protection profile treats handshakes that
use the TCP Fast Open option separately from other SYN and SYN-ACK packets; the
profile by default is set to allow the handshake packets if they contain a valid
Fast Open cookie.
If you have existing Zone Protection profiles in place when you upgrade to PAN-OS
8.0, the three default settings will apply to each profile and the firewall will
act accordingly.
Beginning with PAN-OS 8.1.2 and later releases, you can use a CLI command (step 4 in
the PAN-OS tab) to enable the firewall to generate a Threat log when the firewall
receives and drops the following types of packets, so that you can more easily
analyze these occurrences and also fulfill audit and compliance requirements:
- Teardrop attack
- DoS attack using ping of death
Furthermore, the same CLI command also enables the firewall to generate Threat logs
for the following types of packets if you enable the corresponding Packet Based
Attack Protection:
- Fragmented IP packets
- IP address spoofing
- ICMP packets larger than 1024 bytes
- Packets containing ICMP fragments
- ICMP packets embedded with an error message
- First packets for a TCP session that are not SYN packets
PAN-OS
- Create a Zone Protection profile and configure Packet-Based Attack Protection settings.
- Select and Add a new profile.Enter a Name for the profile and an optional Description.Select Packet Based Attack Protection.On each tab (IP Drop, TCP Drop, ICMP Drop, IPv6 Drop, and ICMPv6 Drop), select the Packet-Based Attack Protection settings you want to enforce to protect a zone.Click OK.Apply the Zone Protection profile to a security zone that is assigned to interfaces you want to protect.
- Select and select the zone where you want to assign the Zone Protection profile.Add the Interfaces belonging to the zone.For Zone Protection Profile, select the profile you just created.Click OK.Commit your changes.(PAN-OS 8.1.2 and later releases) Enable the firewall to generate Threat logs for a teardrop attack and a DoS attack using ping of death, and also generate Threat logs for the types of packets listed above if you enable the corresponding packet-based attack protection (in Step 1). For example, if you enable packet-based attack protection for Spoofed IP address, using the following CLI causes the firewall to generate a Threat log when the firewall receives and drops a packet with a spoofed IP address.
- Access the CLI.Use the operational CLI command set system setting additional-threat-log on. Default is off.
