Detections
Analytics

RHEL-07-030760 - The Red Hat Enterprise Linux operating system must audit all uses of the postdrop command.

Information

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.

At a minimum, the organization must audit the full-text recording of privileged postfix commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.

When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and 'unset' in the same way.

Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172

Solution

Configure the operating system to generate audit records when successful/unsuccessful attempts to use the 'postdrop' command occur.

Add or update the following rule in '/etc/audit/rules.d/audit.rules':

-a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix

The audit daemon must be restarted for the changes to take effect.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_7_V3R15_STIG.zip

Item Details

Category: AUDIT AND ACCOUNTABILITY, MAINTENANCE

References: 800-53|AU-3(1), 800-53|MA-4(1)(a), CAT|II, CCI|CCI-000135, CCI|CCI-002884, Rule-ID|SV-204554r958422_rule, STIG-ID|RHEL-07-030760, STIG-Legacy|SV-86799, STIG-Legacy|V-72175, Vuln-ID|V-204554

Plugin: Unix

Control ID: db4fde92950bc2620214eda047b1920a62c21acd1044647e813ace463346c402