May I check if it is possible to disable SSH CBC cipher and weak MAC hashing on Palo Alto Firewall?
If so, may I know how to do it.
Had no luck searching for a solution online.
Seems like there is no menu/config file (e.g. /etc/ssh/ssh_config) to edit such settings.
This is with relation to Nessus vulnerability findings.
Try to see how it can be addressed.
Thank you in advance
Even the latest Pan-OS version running in FIPS mode still has cbc enabled. There is not a way to modify this.
Decryption (SSHv2 only)
MAC Algorithms: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-sha1-96,hmac-md5-96
HMAC – HMAC-SHA-1
Authentication – RSA (2048 bit key only)
Key agreement – DH Group 14 (2048 bit)
Symmetric Algorithm – AES128, AES192, or AES256 (CBC or CTR for all three)
Good link for setting ciphers. Remember do not include CBC in your config.
For MAC's I used these:
configure set deviceconfig system ssh mac mgmt hmac-sha1 set deviceconfig system ssh mac mgmt hmac-sha2-256 set deviceconfig system ssh mac mgmt hmac-sha2-512 commit
As per below I could understand the CBC mode cipher encryption was handling by server not firewall right ? correct me If I'm wrong ...... Also for that we need to reach the concern server OS vendor or support to change encryption CBC to CTR, GCM encryption.
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