Ensure sshd ClientAliveInterval and ClientAliveCountMax are configured

MoyenneNiveau 1Automatiséeaix

Description

Note: To clarify, the two settings described below are only meant for idle connections from a protocol perspective and are not meant to check if the user is active or not. An idle user does not mean an idle connection. SSH does not and never had, intentionally, the capability to drop idle users. In order to prevent resource exhaustion, appropriate values should be set for both ClientAliveInterval and ClientAliveCountMax. Audit: evaluates the effective configuration from `sshd -T` (Match blocks must be reviewed separately).

Méthode de vérification

Méthode d'audit: Commande shell

shell

command -v sshd >/dev/null 2>&1 || exit 1; out=$(sshd -T 2>/dev/null) || exit 1; r=compliant; for p in '^clientaliveinterval[[:blank:]]+[1-9][0-9]*$' '^clientalivecountmax[[:blank:]]+[1-9][0-9]*$'; do printf '%s\n' "$out" | grep -Eiq -- "$p" || r="not matched: $p"; done; echo "$r"

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Edit the /etc/ssh/sshd_config file to set the ClientAliveInterval and ClientAliveCountMax parameters above any Include and Match entries according to site policy. Example: ClientAliveInterval 15 ClientAliveCountMax 3 Note: First occurrence of a option takes precedence, Match set statements withstanding. If Include locations are enabled, used, and order of precedence is understood in your environment, the entry may be created in a file in Include location.

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: aixssh
Référence: CIS IBM AIX 7 Benchmark v1.2.0 - 4.6.3.18 Ensure sshd ClientAliveInterval and ClientAliveCountMax are configured

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

shell

tmaegis scan --target aix