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UBTU-22-654095 Ubuntu 22.04 LTS must generate audit records for successful/unsuccessful uses of the ssh-keysign command.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to AU-12 via CCI-000172

Title

Ubuntu 22.04 LTS must generate audit records for successful/unsuccessful uses of the ssh-keysign command.

Control

Verify Ubuntu 22.04 LTS generates an audit record upon successful/unsuccessful attempts to use the "ssh-keysign" command by using the following command: $ sudo auditctl -l | grep ssh-keysign -a always,exit -S all -F path=/usr/lib/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=-1 -F key=privileged-ssh If the command does not return lines that match the example or the lines are commented out, this is a finding. Note: The "key=" value is arbitrary and can be different from the example output above.

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).

Related controls

CCI-000172

Fix

Configure the audit system to generate an audit event for any successful/unsuccessful use of the "ssh-keysign" command. Add or modify the following line in the "/etc/audit/rules.d/stig.rules" file: -a always,exit -F path=/usr/lib/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=unset -k privileged-ssh To reload the rules file, issue the following command: $ sudo augenrules --load Note: The "-k " at the end of the line gives the rule a unique meaning to help during an audit investigation. The does not need to match the example above.