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The Red Hat Enterprise Linux operating system must audit all executions of privileged functions.


Overview

Finding ID Version Rule ID IA Controls Severity
V-72095 RHEL-07-030360 SV-86719r6_rule Medium
Description
Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and ongoing concern and can have significant adverse impacts on organizations. Auditing the use of privileged functions is one way to detect such misuse and identify the risk from insider threats and the advanced persistent threat.
STIG Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide 2019-03-08

Details

Check Text ( C-72327r6_chk )
Verify the operating system audits the execution of privileged functions using the following command:

# grep -iw execve /etc/audit/audit.rules

-a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k setuid
-a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k setuid
-a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k setgid
-a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k setgid

Note: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures.
Only the lines appropriate for the system architecture must be present.

If the audit rule for "SUID" files is not defined, this is a finding.

If the audit rule for "SGID" files is not defined, this is a finding.
Fix Text (F-78447r8_fix)
Configure the operating system to audit the execution of privileged functions.

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

Note: The rules are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be configured.

-a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k setuid
-a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k setuid
-a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k setgid
-a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k setgid

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