Ignore Erroneous or Unwanted Queries

СредњаНиво 1Аутоматскаbind

Опис

BIND can be configured to ignore requests originating from specified network segments. This is accomplished by implementing the blackhole option in named.conf. It is recommended that this feature be implemented to ignore requests that originate outside of expected network segments. The audit requires a non-empty blackhole address list in the global options. 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).

Како се проверава

Метод провере: Команда љуске

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 ' ')
printf '%s\n' "$opts" | grep -Eq '[{; ]blackhole \{ *[^} ]' && echo compliant || echo 'no blackhole list in options'

Очекивани излаз: compliant

Како се исправља

Метод исправке: Смерница или закрпа инфраструктуре

Add a blackhole option for multicast and link local addresses, and all private RFC 1918 addresses that are not being used. blackhole { // Private RFC 1918 addresses 10/8; 192.168/16; 172.16/12; // Multicast 224/8; // Link Local 169.254/16; };

Својства

Оперативни системи: Било који
Ознаке: binddnsaccess-control
Референца: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 3.1 Ignore Erroneous or Unwanted Queries

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Покрените ово на рачунару за који имате дозволу за проверу. Скенирање ради у режиму само за читање.

shell

tmaegis scan --target bind