STIGQter: STIG Summary: BIND 9.x Security Technical Implementation Guide Version: 3 Release: 3 Benchmark Date: 01 Jul 2026:

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.

DISA Rule

SV-272375r1123858_rule

Vulnerability Number

V-272375

Group Title

SRG-APP-000176-DNS-000019

Rule Version

BIND-9X-001180

Severity

CAT II

CCI(s)

• CCI-000186 - For public key-based authentication, enforce authorized access to the corresponding private key.

Weight

10

Fix Recommendation

Change the permissions of the TSIG key files:

# chmod 640 <TSIG_key_file>

Check Contents

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-r-----. 1 root named 76 May 10 20:35 tsig-example.key

If the key files are more permissive than 640, this is a finding.

Vulnerability Number

V-272375

Documentable

False

Rule Version

BIND-9X-001180

Severity Override Guidance

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-r-----. 1 root named 76 May 10 20:35 tsig-example.key

If the key files are more permissive than 640, this is a finding.

Check Content Reference

M

Target Key

5687