The system must be configured to use TCP syncookies when experiencing a TCP SYN flood.

From AIX 5.3 Security Technical Implementation Guide

Part of GEN003612

Associated with IA controls: ECSC-1

Associated with: CCI-001092

SV-38803r1_rule The system must be configured to use TCP syncookies when experiencing a TCP SYN flood.

Vulnerability discussion

A TCP SYN flood attack can cause Denial of Service by filling a system's TCP connection table with connections in the SYN_RCVD state. Syncookies are a mechanism used to not track a connection until a subsequent ACK is received, verifying the initiator is attempting a valid connection and is not a flood source. This technique does not operate in a fully standards-compliant manner, but is only activated when a flood condition is detected, and allows defense of the system while continuing to service valid requests.

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Fix text

#/usr/sbin/no -p -o clean_partial_conns=1

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