Do Not Define a Static Source Port

SrednjaNivo 1Automatskabind

Opis

BIND can be configured to always use the same source port when communicating with other DNS servers. This capability is made possible through the query-source port option, and the query-source-v6 port option. It is recommended that the source port be omitted if the query-source option is used, or that the port be specified as a *, so that the port will not be a static port ... The audit fails when any query-source or query-source-v6 statement sets a fixed port (port * / port 0 is allowed). 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).

Kako se proverava

Metod provere: Komanda ljuske

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 'query-source(-v6)? [^;]*;' | grep -E ' port [1-9][0-9]*')
[ -z "$bad" ] && echo compliant || { echo 'static query source port:'; printf '%s\n' "$bad"; }

Očekivani izlaz: compliant

Kako se ispravlja

Metod ispravke: Smernica ili zakrpa infrastrukture

Either remove the port specification from the query-source or the query-source-v6 option or use an * for the port number.

Svojstva

Operativni sistemi: Bilo koji
Oznake: binddnsdnssec
Referenca: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 7.1 Do Not Define a Static Source Port

Proverite ovaj računar

Pokrenite ovo na računaru za koji imate dozvolu za proveru. Skeniranje radi u režimu samo za čitanje.

shell

tmaegis scan --target bind