Do Not Define a Static Source Port

SedangLevel 1Otomatisbind

Deskripsi

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).

Cara pemeriksaan

Metode audit: Perintah shell

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"; }

Output yang diharapkan: compliant

Cara perbaikan

Metode perbaikan: Panduan atau patch infrastruktur

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

Properti

Sistem operasi: Apa saja
Tag: binddnsdnssec
Referensi: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 7.1 Do Not Define a Static Source Port

Periksa host ini

Jalankan ini pada mesin yang diizinkan untuk Anda audit. Pemindaian bersifat hanya baca.

shell

tmaegis scan --target bind