NESSUS tool found below vulnerability on the scan of a Linux server.
90317 – SSH Weak Algorithms Supported
Synopsis
The remote SSH server is configured to allow weak encryption algorithms or no algorithm at all.
Description
Nessus has detected that the remote SSH server is configured to use the Arcfour stream cipher or no cipher at all. RFC 4253 advises against using Arcfour due to an issue with weak keys.
Solution
To disable SSH weak algorithms supported in Linux you need to Disable SSH Server Weak and CBC Mode Ciphers and SSH Weak MAC Algorithms. Follow the articles given below to disable ssh weak algorithms support in a Linux server.
Last Updated: July 16, 2021