Ensure sshd Ciphers are configured

YüksekDüzey 1Otomatikfreebsd

Açıklama

This variable limits the ciphers that SSH can use during communication. Note: Some organizations may have stricter requirements for approved ciphers. Ensure that ciphers used are in compliance with site policy. The only "strong" ciphers currently FIPS 140-2 compliant are: o aes256-ctr o aes192-ctr o aes128-ctr Audit: the effective `ciphers` list from `sshd -T` must not contain any weak algorithm listed by CIS.

Nasıl denetlenir

Denetim yöntemi: Kabuk komutu

shell

command -v sshd >/dev/null 2>&1 || exit 1; out=$(sshd -T 2>/dev/null) || exit 1; line=$(printf '%s\n' "$out" | grep -i '^ciphers '); [ -n "$line" ] || exit 1; printf '%s\n' "$line" | grep -Eiq -- '(^|[ ,])((3des|blowfish|cast128|aes(128|192|256))-cbc|arcfour(128|256)?|rijndael-cbc@lysator\.liu\.se)(,|$)' && echo "weak: $line" || echo compliant

Beklenen çıktı: compliant

Nasıl düzeltilir

Düzeltme yöntemi: Kılavuz veya altyapı yaması

Edit the /etc/ssh/sshd_config file and add/modify the Ciphers line to contain a comma separated list of the site unapproved (weak) Ciphers preceded with a - above any Include entries: Example: Ciphers -3des-cbc,aes128-cbc,aes192-cbc,aes256-cbc,rijndael- cbc@lysator.liu.se

Özellikler

İşletim sistemleri: Herhangi biri
Etiketler: freebsdssh
Referans: CIS FreeBSD 14 Benchmark v1.0.1 - 4.2.6 Ensure sshd Ciphers are configured

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shell

tmaegis scan --target freebsd