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V-275731

CAT II (Medium)

Ubuntu OS must generate audit records when successful/unsuccessful attempts to modify the /etc/sudoers file occur.

Rule ID

SV-275731r1148243_rule

STIG

Riverbed NetIM OS Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000172

Discussion

Without generating audit records 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).

Check Content

Verify Ubuntu OS generates audit records for all modifications that affect "/etc/sudoers" by using the following command:  
  
     $ sudo auditctl -l | grep sudoers  
     -w /etc/sudoers -p wa -k privilege_modification  
  
If the command does not return a line that matches the example or the line is commented out, this is a finding.  
  
Note: The "-k" value is arbitrary and can be different from the example output above.

Fix Text

Configure Ubuntu OS to generate audit records for all modifications that affect "/etc/sudoers".   
 
Add or modify the following line to "/etc/audit/rules.d/stig.rules":  
 
-w /etc/sudoers -p wa -k privilege_modification  
 
To reload the rules file, issue the following command:  
 
     $ sudo augenrules --load 
 
Note: The "-k <keyname>" at the end of the line gives the rule a unique meaning to help during an audit investigation. The <keyname> does not need to match the example above.