Ensure to set Strong SSH KEY Exchange algorithm

SedangLevel 1Otomatisf5-bigip

Deskripsi

To set strong Key Exchange algorithm PASS requires the sys sshd include statement to contain a KexAlgorithms line whose algorithms all use SHA-256 or stronger (e.g. diffie-hellman-group14-sha256). Audited against tmsh output with defaults shown: save the concatenated output of 'tmsh list auth password-policy all-properties', 'tmsh list auth source all-properties', 'tmsh list auth remote-user all-properties', 'tmsh list auth radius all-properties', 'tmsh list sys httpd all-properties', 'tmsh list sys sshd all-properties', 'tmsh list sys global-settings all-properties', 'tmsh list cli global-settings all-properties', 'tmsh list sys ntp', 'tmsh list sys snmp all-properties', 'tmsh list sys syslog' and 'tmsh list net self all-properties'. Patterns are scoped to the named top-level block.

Cara pemeriksaan

Metode audit: Pola konfigurasi

Pola: (?ms)^sys sshd \{\n(?:[ \t]+[^\n]*\n)*?[ \t]+include \"[^\"]*\bKexAlgorithms (?:[\w@.-]*(?:sha256|sha384|sha512|sha2-nistp\d+|curve25519|curve448)[\w@.-]*,?)+\"?[ \t]*$

Cara perbaikan

Metode perbaikan: Panduan atau patch infrastruktur

tmsh modify sys sshd include "KexAlgorithms diffie-hellman-group14-sha256" (merge with any existing Ciphers/MACs lines in the same include string) tmsh save sys config # CIS guidance: 1-Log in to tmsh by typing the following command:tmsh 2-To modify the sshd configuration, type the following command to start the vi editor:edit /sys sshd all-properties 3-Set a Key-Exchange algorithm with key of size 256 or longer example diffie-hellman-group14-sha256) 4-To change the list of ciphers, you can navigate to the line that starts with the include statement, and use the keyword KexAlgorithms ,and adding the list of desired KexAlgorithms to the 2-line include statement: include "Ciphers aes128-cbc,aes128-ctr,aes192-ctr,aes256- ctr,arcfour128,arcfour256,arcfour MACs hmac-sha2-256 KexAlgorithms diffie-hellman-group14-sha256

Properti

Sistem operasi: Apa saja
Tag: f5-bigipcrypto
Referensi: CIS F5 Networks Benchmark v1.0.0 - 4.7 Ensure to set Strong SSH KEY Exchange algorithm

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shell

tmaegis scan --target f5-bigip