TCP backlog queue sizes must be set appropriately.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-23741	GEN003601	SV-29690r1_rule	ECSC-1	Medium

Description
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.

STIG	Date
HP-UX 11.23 Security Technical Implementation Guide	2015-12-02

Details

Check Text ( C-30047r1_chk )
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 (F-26884r1_fix)
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