V-207698
Palo Alto Networks IDPS Security Technical Implementation Guide
Title
The Palo Alto Networks security platform must block outbound ICMP Destination Unreachable, Redirect, and Address Mask reply messages.
Description
<VulnDiscussion>Internet Control Message Protocol (ICMP) messages are used to provide feedback about problems in the network. These messages are sent back to the sender to support diagnostics. However, some messages can also provide host information and network topology that may be exploited by an attacker. Review the vendor documentation for more information about "How to Allow/Block ICMP Error Reporting Packets". Note that this setting is only available in the Zone Protection profile option,...
Fix Text (Documentation Requirement)
Create a zone protection profile for each outgoing zone that drops any ICMP Destination Unreachable, Redirect, and Address Mask reply messages. 1. Navigate to the "Zone Protection Profile" configuration screen. 2. Select the "Packet Based Attack Protection" tab. 3. Select the "ICMP Drop" tab. 4. Check the "Discard ICMP embedded with error message" box.