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.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-207565	SRG-APP-000176-DNS-000019	BIND-9X-001112	SV-207565r879613_rule	2024-02-15	2

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

ℹ️ Check
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.

ℹ️ Check

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.

✔️ Fix
Change the permissions of the TSIG key files: # chmod 600 <TSIG_key_file>