Set Maximum Number of Incoming Connections

MediumLevel 1Automatedsolaris

Description

This setting controls the maximum number of incoming connections that can be accepted on a TCP port. Note that the value of 1024 is a minimum to establish a good security posture for this setting. In environments where connection numbers are high, such as a busy webserver, this value may need to be increased. Audit: `ipadm show-prop -p _conn_req_max_q` must be 1024 for both the current and persistent values.

How it is checked

Audit method: Shell command

shell

command -v ipadm >/dev/null 2>&1 || exit 1; r=compliant; for p in tcp; do for k in current persistent; do v=$(ipadm show-prop -p _conn_req_max_q -co $k $p 2>/dev/null); [ "$v" = '1024' ] || r="_conn_req_max_q $p $k=$v"; done; done; echo "$r"

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

ipadm set-prop -p _conn_req_max_q=1024 tcp

Properties

Operating systems: Any
Tags: solarishardening
Reference: CIS Oracle Solaris 11.4 Benchmark v1.1.0 - 3.16 Set Maximum Number of Incoming Connections

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target solaris