SLEM 5 must generate audit records for all uses of privileged functions.

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.

Verify SLEM 5 generates an audit record for any privileged use of the "execve" system call with the following command:

     > sudo auditctl -l | grep -w 'execve'
     -a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -F key=setuid
     -a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -F key=setuid
     -a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -F key=setgid
     -a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -F key=setgid

If both the "b32" and "b64" audit rules for "SUID" files are not defined, this is a finding.

If both the "b32" and "b64" audit rules for "SGID" files are not defined, this is a finding.

Note: The "key=" value is arbitrary and can be different from the example output above.

Configure SLEM 5 to generate an audit record for any privileged use of the "execve" system call.

Add or modify the following lines in "/etc/audit/rules.d/audit.rules" file:

-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

To reload the rules file, restart the audit daemon:

     > sudo systemctl restart auditd.service

or issue the following command:

     > sudo augenrules --load