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 unlinkat syscall.

DISA Rule

SV-204573r603261_rule

Vulnerability Number

V-204573

Group Title

SRG-OS-000466-GPOS-00210

Rule Version

RHEL-07-030920

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.
• CCI-002884 - The organization audits nonlocal maintenance and diagnostic sessions^ organization-defined audit events.

Weight

10

Fix Recommendation

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

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

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

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

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 "unlinkat" syscall occur.

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

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

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

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

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

Vulnerability Number

V-204573

Documentable

False

Rule Version

RHEL-07-030920

Severity Override Guidance

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

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

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

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

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

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

Check Content Reference

M

Target Key

2899

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