How to hide version information of bind DNS server?

Solution Verified - Updated -

Issue

  • STIG finding: The DNS Name Server software must be configured to refuse queries for its version information. (V-205194)
  • I would like to hide version information of bind for the query from the client like below.

    # dig @127.0.0.1 version.bind chaos txt
    
    ; <<>> DiG 9.16.23-RH <<>> @127.0.0.1 version.bind chaos txt
    ; (1 server found)
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59832
    ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
    
    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 1232
    ; COOKIE: 6c12ddef23c6872301000000666a34d5bdcadcc99495e497 (good)
    ;; QUESTION SECTION:
    ;version.bind.          CH  TXT
    
    ;; ANSWER SECTION:
    version.bind.       0   CH  TXT "9.16.23-RH"     <<<<<=====
    
    ;; Query time: 1 msec
    ;; SERVER: 127.0.0.1#53(127.0.0.1)
    ;; WHEN: Thu Jun 13 09:52:53 AEST 2024
    ;; MSG SIZE  rcvd: 92
    

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • ISC BIND DNS server
    • bind

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