Vulnerability Discussion

Without reauthentication, users may access resources or perform tasks for which they do not have authorization.

When operating systems provide the capability to escalate a functional capability, it is critical the organization requires the user to reauthenticate when using the "sudo" command.

If the value is set to an integer less than 0, the user's time stamp will not expire and the user will not have to reauthenticate for privileged actions until the user's session is terminated.

Check

Verify the operating system requires reauthentication when using the "sudo" command to elevate privileges.

$ sudo egrep -ir 'timestamp_timeout' /etc/sudoers /etc/sudoers.d
/etc/sudoers:Defaults timestamp_timeout=0

If "timestamp_timeout" is set to a negative number, is commented out, or no results are returned, this is a finding.

Fix

Configure the "sudo" command to require reauthentication.

Edit the /etc/sudoers file:
$ sudo visudo

Add or modify the following line:
Defaults timestamp_timeout=0