The read and write access to a TSIG key file used by a BIND 9.x server must be restricted to only the account that runs the name server software.

Weak permissions of a TSIG key file could allow an adversary to modify the file, thus defeating the security objective.

Verify permissions assigned to the TSIG keys enforce read-write access to the key owner and deny access to group or system users:

With the assistance of the DNS Administrator, determine the location of the TSIG keys used by the BIND 9.x implementation:

# ls –al <TSIG_Key_Location> -rw-------. 1 named named 76 May 10 20:35 tsig-example.key

If the key files are more permissive than 600, this is a finding.

Change the permissions of the TSIG key files:

# chmod 600 <TSIG_key_file>