sshkey-exchange-algorithmsecdh-sha2-nistp256curve25519-sha256diffie-hellman-group-exchange-sha256 Reference:Aruba Documentation Pentesting SSH Weak Key Exchange Algorithm The followingnmapscript is the fastest way to confirm algorithm supported:
service sshd restart Then you can confirm with the local command: sshd -T | grep -i kex and it will list what our SSHD accepts. Also you can confirm this with the following nmap command: nmap -sV -p 22 --script ssh2-enum-algos <servername>...
The server ultimately decides which cipher to use from the ones offered by both sides.Even if we deny weak ciphers on the client, the server can still choose them if they are enabled on its side. Let’s disable the3des-cbccipher on the client side using the SSH client config file (/et...
Our client ordered PenTest, and as a feedback they got recommendation to "Disable SSH CBC Mode Ciphers, and allow only CTR ciphers" and "Disable weak SSH MD5 and 96-bit MAC algorithms" on their Cisco 4506-E switches with CIsco IOS 15.0 I have gone through Cisco documentation that i coul...
(gen) compression: enabled (zlib@openssh.com) # key exchange algorithms (kex) curve25519-sha256 -- [warn] unknown algorithm (kex) curve25519-sha256@libssh.org -- [info] available since OpenSSH 6.5, Dropbear SSH 2013.62 (kex) ecdh-sha2-nistp256 -- [fail] using weak elliptic curves ...