Hi,
In a recent security review some systems I manage were flagged due to supporting "weak" ciphers, specifically the ones listed below. So first question is are people generally modifying the list of ciphers supported by the ssh client and sshd?
On CentOS 6 currently it looks like if I remove all the ciphers they are concerned about then I am left with Ciphers aes128-ctr,aes192-ctr,aes256-ctr for both /etc/ssh/sshd_config and /etc/ssh/ssh_config. Is just using these three ciphers like to cause me any problems? Could having so few ciphers be creating a security concern itself?
Thanks
The following weak client-to-server encryption algorithms are supported by the remote service: rijndael-cbc@lysator.liu.se arcfour256 arcfour128 aes256-cbc 3des-cbc aes192-cbc blowfish-cbc cast128-cbc arcfour aes128-cbc
The following weak server-to-client encryption algorithms are supported by the remote service: rijndael-cbc@lysator.liu.se arcfour256 arcfour128 aes256-cbc 3des-cbc aes192-cbc blowfish-cbc cast128-cbc arcfour aes128-cbc