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.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-207565	BIND-9X-001112	SV-207565r612253_rule		Medium

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

STIG	Date
BIND 9.x Security Technical Implementation Guide	2021-06-23

Details

Check Text ( C-7820r283749_chk )
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 -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.

Fix Text (F-7820r283750_fix)
Change the permissions of the TSIG key files: # chmod 600