STIGQter: STIG Summary: Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 10 Mar 2021:

The Ubuntu operating system must generate audit records for successful/unsuccessful uses of the openat system call.

DISA Rule

SV-238275r654000_rule

Vulnerability Number

V-238275

Group Title

SRG-OS-000064-GPOS-00033

Rule Version

UBTU-20-010159

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 audit system to generate an audit event for any unsuccessful use of the "openat" system call.

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

-a always,exit -F arch=b32 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k perm_access
-a always,exit -F arch=b32 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k perm_access
-a always,exit -F arch=b64 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k perm_access
-a always,exit -F arch=b64 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k perm_access

Notes: For 32-bit architectures, only the 32-bit specific entries are required.

To reload the rules file, issue the following command:

$ sudo augenrules --load

Check Contents

Verify the Ubuntu operating system generates an audit record upon unsuccessful attempts to use the "openat" system call.

Check the configured audit rules with the following commands:

$ sudo auditctl -l | grep openat

-a always,exit -F arch=b32 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=-1 -k perm_access
-a always,exit -F arch=b32 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=-1 -k perm_access
-a always,exit -F arch=b64 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=-1 -k perm_access
-a always,exit -F arch=b64 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=-1 -k perm_access

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

Notes:
- For 32-bit architectures, only the 32-bit specific output lines from the commands are required.
- The "-k" allows for specifying an arbitrary identifier, and the string after it does not need to match the example output above.

Vulnerability Number

V-238275

Documentable

False

Rule Version

UBTU-20-010159

Severity Override Guidance

Verify the Ubuntu operating system generates an audit record upon unsuccessful attempts to use the "openat" system call.

Check the configured audit rules with the following commands:

$ sudo auditctl -l | grep openat

-a always,exit -F arch=b32 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=-1 -k perm_access
-a always,exit -F arch=b32 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=-1 -k perm_access
-a always,exit -F arch=b64 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=-1 -k perm_access
-a always,exit -F arch=b64 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=-1 -k perm_access

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

Notes:
- For 32-bit architectures, only the 32-bit specific output lines from the commands are required.
- The "-k" allows for specifying an arbitrary identifier, and the string after it does not need to match the example output above.

Check Content Reference

M

Target Key

5318

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