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The Photon operating system must generate audit records when successful/unsuccessful attempts to access privileges occur.


Overview

Finding ID Version Rule ID IA Controls Severity
V-239092 PHTN-67-000020 SV-239092r816603_rule Medium
Description
The changing of file permissions could indicate that a user is attempting to gain access to information that would otherwise be disallowed. Auditing DAC modifications can facilitate the identification of patterns of abuse among both authorized and unauthorized users. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000462-GPOS-00206
STIG Date
VMware vSphere 6.7 Photon OS Security Technical Implementation Guide 2022-06-17

Details

Check Text ( C-42303r816601_chk )
At the command line, execute the following command:

# auditctl -l | grep chmod

Expected result:

-a always,exit -F arch=b64 -S chmod,fchmod,chown,fchown,fchownat,fchmodat -F auid>=1000 -F auid!=-1 -F key=perm_mod
-a always,exit -F arch=b64 -S chmod,fchmod,chown,fchown,lchown,setxattr,lsetxattr,fsetxattr,removexattr,lremovexattr,fremovexattr,fchownat,fchmodat -F key=perm_mod
-a always,exit -F arch=b32 -S chmod,fchmod,fchown,chown,fchownat,fchmodat -F auid>=1000 -F auid!=-1 -F key=perm_mod
-a always,exit -F arch=b32 -S chmod,lchown,fchmod,fchown,chown,setxattr,lsetxattr,fsetxattr,removexattr,lremovexattr,fremovexattr,fchownat,fchmodat -F key=perm_mod

If the output does not match the expected result, this is a finding.

Note: This check depends on the auditd service to be in a running state for accurate results. Enabling the auditd service is done as part of a separate control.
Fix Text (F-42262r816602_fix)
Open /etc/audit/rules.d/audit.STIG.rules with a text editor and add the following lines:

-a always,exit -F arch=b64 -S chmod,fchmod,chown,fchown,fchownat,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b64 -S chmod,fchmod,chown,fchown,lchown,setxattr,lsetxattr,fsetxattr,removexattr,lremovexattr,fremovexattr,fchownat,fchmodat -k perm_mod
-a always,exit -F arch=b32 -S chmod,fchmod,fchown,chown,fchownat,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b32 -S chmod,lchown,fchmod,fchown,chown,setxattr,lsetxattr,fsetxattr,removexattr,lremovexattr,fremovexattr,fchownat,fchmodat -k perm_mod

At the command line, execute the following command:

# /sbin/augenrules --load