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Oracle Linux: SSH Security Configuration Rollback Problem

edited Feb 24, 2024 5:14AM in Linux

Applies to:

Oracle Cloud Infrastructure - Version N/A and later

Linux OS - Version Oracle Linux 7.0 to Oracle Linux 9.3 [Release OL7 to OL9U3]

Information in this document applies to any platform.

 

Symptoms

When attempting to disable weak cipher and insecure HMAC algorithms in SSH services following the instructions provided in this documentation: https://community.oracle.com/customerconnect/discussion/668444/how-to-disable-weak-ciphers-such-as-cipher-block-chaining-cbc-ciphers-on-oracle-linux, the changes made to the configuration files (/etc/ssh/sshd_config and /etc/sysconfig/sshd) are automatically reverting to their original settings after a certain period.

 

Changes

Change the configuration files (/etc/ssh/sshd_config and /etc/sysconfig/sshd) to disable the HMAC MD5 and the CBC ciphers.

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