Ensure sshd ReKeyLimit is configured

MediaNivel 1Automatizadaaix

Descripción

This variable specifies the maximum amount of data that may be transmitted before the session key is renegotiated, optionally followed by a maximum amount of time that may pass before the session key is renegotiated. This recommendation is based on the guidelines outlined in Chapter 9 in [RFC4253], i.e. the recommendation is to release/renew Session keys after one hour or after the transfer of one gigabyte (depending on whichever comes first). Audit: evaluates the effective configuration from `sshd -T` (Match blocks must be reviewed separately).

Cómo se verifica

Método de auditoría: Comando de shell

shell

command -v sshd >/dev/null 2>&1 || exit 1; out=$(sshd -T 2>/dev/null) || exit 1; r=compliant; for p in '^rekeylimit[[:blank:]]+1073741824[[:blank:]]+3600$'; do printf '%s\n' "$out" | grep -Eiq -- "$p" || r="not matched: $p"; done; echo "$r"

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: RekeyLimit 1G 3600

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: aixssh
Referencia: CIS IBM AIX 7 Benchmark v1.2.0 - 4.6.3.17 Ensure sshd ReKeyLimit is configured

Verificar este host

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

shell

tmaegis scan --target aix