On 1/5/18 1:31 PM, Steve Grubb wrote:
On Friday, January 5, 2018 12:51:42 PM EST Jan Lieskovsky wrote:
Hello,

On Fri, Jan 5, 2018 at 6:00 PM, Paige, David B CTR USARMY ICOE (US) <

david.b.paige.ctr@mail.mil> wrote:
This check and some related ones require auditing for all users and root.
The suggested line includes these elements:

-a always,exit -F arch=ARCH -S rmdir,unlink,unlinkat,rename,renameat -F
auid>=500 -F auid!=4294967295 -k delete
You might want to check that 500 is the right number
# grep -w UID_MIN /etc/login.defs

 
Should this check include "-F auid=0" to properly audit the root user?
IIRC the motivation why "-F auid=0" was omitted at the time when writing
these audit rules for SSG it is / was
as follows -- you don't need to audit actions of root user (they need to be
trusted). IOW there is just one user,
able to act as root, and that one should / needs to be trusted.

If root user account is shared between multiple users (and therefore you
truly need to audit root account), you would have more troubles at the
system (because would actually deny the traceability / mapping of performed
actions back to the user, who performed these actions). In such case even
having audit log entry, you couldn't tell which of the users sharing the
root account performed the particular action.
To maybe simplify this a bit...elsewhere in the STIG, root logins are 
disallowed. Therefore you cannot have an interactive session where auid is 0. 
If you allowed root logins, then you have an attribution problem because root 
is a shared account and you don't know who is acting as root.
^^ that's the reasoning we (Red Hat and NSA) used when signing off on the RHEL6 STIGs.
-- 
Shawn Wells
Chief Security Strategist 
North America Public Sector
shawn@redhat.com   |   443-534-0130