The system must provide protection for the TCP stack against connection resets, SYN, and data injection attacks.

From AIX 5.3 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000032

SV-38701r1_rule The system must provide protection for the TCP stack against connection resets, SYN, and data injection attacks.

Vulnerability discussion

The tcp_tcpsecure parameter provides protection for TCP connections from fake SYN's, fake RST, and data injections on established connections. The first vulnerability involves sending a fake SYN to an established connection to abort the connection. The second vulnerability involves sending a fake RST to an established connection to abort the connection. The third vulnerability involves injecting fake data in an established TCP connection.

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Fix text

Set the tcp_tcpsecure parameter to 7. # /usr/sbin/no -p -o tcp_tcpsecure=7

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