TMA-BIND-5.3
Securely Authenticate Update Forwarding
Descrição
A secondary authoritative name server is allowed to accept zone updates on behalf of the primary name server, and forward them to the master name server, where the zone file can be updated. In this case, the authentication of the dynamic updates is configured with the allow-update-forwarding option. The audit requires every allow-update-forwarding list to contain only none or key <name> entries. The audit parses the effective configuration printed by named-checkconf -p (all include files resolved) from /etc/named.conf (RHEL; chroot /var/named/chroot is detected) or /etc/bind/named.conf (Debian/Ubuntu).
Como é verificado
Método de auditoria: Comando shell
if [ -f /var/named/chroot/etc/named.conf ]; then out=$(named-checkconf -t /var/named/chroot -p /etc/named.conf 2>/dev/null) || exit 1
else conf=/etc/named.conf; [ -f "$conf" ] || conf=/etc/bind/named.conf
out=$(named-checkconf -p "$conf" 2>/dev/null) || exit 1; fi
flat=$(printf '%s\n' "$out" | tr '\t\n' ' ' | tr -s ' ')
opts=$(printf '%s\n' "$out" | awk '/^options[ \t]*\{/{f=1} f{print} f&&/^\};/{exit}' | tr '\t\n' ' ' | tr -s ' ')
bad=$(printf '%s\n' "$flat" | grep -Eo '(^|[ ;{])allow-update-forwarding \{[^}]*\}' | sed 's/.*allow-update-forwarding {//; s/}$//' | tr ';' '\n' | sed 's/^ *//; s/ *$//' | grep -v '^$' | grep -Eiv '^("?none"?|key "?[^ "]+"?)$')
[ -z "$bad" ] && echo compliant || { echo 'allow-update-forwarding entries not allowed:'; printf '%s\n' "$bad" | sort -u; }- Saída esperada
compliant
Como é corrigido
Método de correção: Orientação ou patch de infraestrutura
Modify any allow-update-forwarding options to specify a securely generated TSIG or SIG(0) key identifier used by the DHCP server.
Propriedades
- Sistemas operacionais
- Qualquer
- Tags
- binddnszone-transfer
- Referência
- CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 5.3 Securely Authenticate Update Forwarding
Verificar este host
Execute isto em uma máquina que você tenha permissão para auditar. A varredura é somente leitura.
tmaegis scan --target bind