RHEL 9 must audit uses of the "execve" system call.

Documentable No

Rule ID SV-258176r1155595_rule

CCI References

CCI-002233CCI-002234

Discussion

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. Satisfies: SRG-OS-000326-GPOS-00126, SRG-OS-000327-GPOS-00127

Check Procedure

Verify RHEL 9 is configured to audit the execution of the "execve" system call with the following command:

$ sudo auditctl -l | grep execve

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

If the command does not return all lines, or the lines are commented out, this is a finding.

Fix Action

Configure RHEL 9 to audit the execution of the "execve" system call.

Add or update the following file system rules to "/etc/audit/rules.d/audit.rules":

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

To load the rules to the kernel immediately, use the following command:

$ sudo augenrules --load