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 any use of the removexattr system call.

DISA Rule

SV-238261r653958_rule

Vulnerability Number

V-238261

Group Title

SRG-OS-000064-GPOS-00033

Rule Version

UBTU-20-010145

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 successful/unsuccessful use of the "removexattr" system call.

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

-a always,exit -F arch=b32 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b32 -S removexattr -F auid=0 -k perm_mod
-a always,exit -F arch=b64 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b64 -S removexattr -F auid=0 -k perm_mod

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 successful/unsuccessful attempts to use the "removexattr" system call.

Check the currently configured audit rules with the following command:

$ sudo auditctl -l | grep removexattr

-a always,exit -F arch=b32 -S removexattr -F auid>=1000 -F auid!=-1 -k perm_mod
-a always,exit -F arch=b32 -S removexattr -F auid=0 -k perm_mod
-a always,exit -F arch=b64 -S removexattr -F auid>=1000 -F auid!=-1 -k perm_mod
-a always,exit -F arch=b64 -S removexattr -F auid=0 -k perm_mod

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-238261

Documentable

False

Rule Version

UBTU-20-010145

Severity Override Guidance

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

Check the currently configured audit rules with the following command:

$ sudo auditctl -l | grep removexattr

-a always,exit -F arch=b32 -S removexattr -F auid>=1000 -F auid!=-1 -k perm_mod
-a always,exit -F arch=b32 -S removexattr -F auid=0 -k perm_mod
-a always,exit -F arch=b64 -S removexattr -F auid>=1000 -F auid!=-1 -k perm_mod
-a always,exit -F arch=b64 -S removexattr -F auid=0 -k perm_mod

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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