4.1.4 Ensure events that modify user/group information are collected - auditctl /etc/group

Information

Record events affecting the group , passwd (user IDs), shadow and gshadow (passwords) or /etc/security/opasswd (old passwords, based on remember parameter in the PAM configuration) files. The parameters in this section will watch the files to see if they have been opened for write or have had attribute changes (e.g. permissions) and tag them with the identifier 'identity' in the audit log file.



Note: Reloading the auditd config to set active settings may require a system reboot.

Rationale:

Unexpected changes to these files could be an indication that the system has been compromised and that an unauthorized user is attempting to hide their activities or compromise additional accounts.

Solution

Edit or create a file in the /etc/audit/rules.d/ directory ending in .rules
Example: vi /etc/audit/rules.d/identity.rules
and add the following lines:

-w /etc/group -p wa -k identity
-w /etc/passwd -p wa -k identity
-w /etc/shadow -p wa -k identity
-w /etc/security/opasswd -p wa -k identity

See Also

https://workbench.cisecurity.org/files/3682

Item Details

Category: AUDIT AND ACCOUNTABILITY

References: 800-53|AU-3, 800-53|AU-3(1), CSCv7|4.8

Plugin: Unix

Control ID: c7df1e7dd4ec9a46bbd2951ccf7786325ad25decf7198848e08810e928021a38