STIGQter: STIG Summary: Red Hat Enterprise Linux 7 Security Technical Implementation Guide Version: 3 Release: 3 Benchmark Date: 23 Apr 2021:

The Red Hat Enterprise Linux operating system must audit all uses of the chmod syscall.

DISA Rule

SV-204521r603261_rule

Vulnerability Number

V-204521

Group Title

SRG-OS-000458-GPOS-00203

Rule Version

RHEL-07-030410

Severity

CAT II

CCI(s)

• CCI-000172 - The information system generates audit records for the events defined in AU-2 d. with the content defined in AU-3.

Weight

10

Fix Recommendation

Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "chmod" syscall occur.

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

-a always,exit -F arch=b32 -S chmod -F auid>=1000 -F auid!=unset -k perm_mod

-a always,exit -F arch=b64 -S chmod -F auid>=1000 -F auid!=unset -k perm_mod

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

Check Contents

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chmod" syscall occur.

Check the file system rules in "/etc/audit/audit.rules" with the following command:

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

-a always,exit -F arch=b32 -S chmod -F auid>=1000 -F auid!=unset -k perm_mod

-a always,exit -F arch=b64 -S chmod -F auid>=1000 -F auid!=unset -k perm_mod

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

Vulnerability Number

V-204521

Documentable

False

Rule Version

RHEL-07-030410

Severity Override Guidance

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chmod" syscall occur.

Check the file system rules in "/etc/audit/audit.rules" with the following command:

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

-a always,exit -F arch=b32 -S chmod -F auid>=1000 -F auid!=unset -k perm_mod

-a always,exit -F arch=b64 -S chmod -F auid>=1000 -F auid!=unset -k perm_mod

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

Check Content Reference

M

Target Key

2899

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