Ensure SSH LogLevel is appropriate

MediaNivel 1Automatizadalinux

Descripción

INFO level is the basic level that only records login activity of SSH users. In many situations, such as Incident Response, it is important to determine when a particular user was active on a system. The logout record can eliminate those users who disconnected, which helps narrow the field. VERBOSE level specifies that login and logout activity as well as the key fingerprint for any SSH key used for login will be logged. This information is important for SSH key management, especially in legacy environments.

Cómo se verifica

Método de auditoría: Comando de shell

shell

alt0() { command -v grep >/dev/null 2>&1 || { echo "step1: grep not installed"; return 1; }; command -v sshd >/dev/null 2>&1 || { echo "step1: sshd not installed"; return 1; }; o=$(bash -c 'sshd -T | grep loglevel' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'LogLevel VERBOSE' || { echo step1: missing 'LogLevel VERBOSE'; return 1; }; }; if alt0; then echo compliant; fi

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Edit the /etc/ssh/sshd_config file to set the parameter as follows: LogLevel VERBOSE or LogLevel INFO Restart sshd : systemctl restart sshd

Propiedades

Sistemas operativos: alinux-2
Etiquetas: cis-convertedlinux
Referencia: CIS Aliyun Linux 2 Benchmark v1.0.0 ARCHIVE - 5.2.5

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target linux