STIGQter: STIG Summary: Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The Ubuntu operating system must generate audit records for successful/unsuccessful uses of the ssh-keysign command.

DISA Rule

SV-219243r610963_rule

Vulnerability Number

V-219243

Group Title

SRG-OS-000064-GPOS-00033

Rule Version

UBTU-18-010320

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 "ssh-keysign" command.

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

-a always,exit -F path=/usr/lib/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-ssh

In order to reload the rules file, issue the following command:

# sudo augenrules --load

Note:
The "root" account must be used to view/edit any files in the /etc/audit/rules.d/ directory.

Check Contents

Verify the Ubuntu operating system generates an audit record when successful/unsuccessful attempts to use the "ssh-keysign" command occur.

Check the configured audit rules with the following commands:

#sudo auditctl -l | grep ssh-keysign

-a always,exit -F path=/usr/lib/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-ssh

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

Note: 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-219243

Documentable

False

Rule Version

UBTU-18-010320

Severity Override Guidance

Verify the Ubuntu operating system generates an audit record when successful/unsuccessful attempts to use the "ssh-keysign" command occur.

Check the configured audit rules with the following commands:

#sudo auditctl -l | grep ssh-keysign

-a always,exit -F path=/usr/lib/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-ssh

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

Note: 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

4055

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