TCP backlog queue sizes must be set appropriately.

From HP-UX 11.31 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-29690r1_rule TCP backlog queue sizes must be set appropriately.

Vulnerability discussion

To provide some mitigation to TCP Denial of Service (DoS) attacks, the TCP backlog queue sizes must be set to at least 1280 or in accordance with product-specific guidelines.

Check content

Check the value of the tcp_syn_rcvd_max parameter. # ndd -get /dev/tcp tcp_syn_rcvd_max If the returned value is less than 1280, this is a finding.

Fix text

Set the tcp_syn_rcvd_max parameter to 1280. # ndd -set /dev/tcp tcp_syn_rcvd_max 1280 Edit /etc/rc.config.d/nddconf and add/set: TRANSPORT_NAME[x] = tcp NDD_NAME[x] = tcp_syn_rcvd_max NDD_VALUE[x] = 1280

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