The F5 BIG-IP DNS implementation must protect the authenticity of communications sessions for zone transfers.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-265990 | F5BI-DN-300036 | SV-265990r1024864_rule | CCI-001184 | high |
| Description | ||||
| DNS is a fundamental network service that is prone to various attacks, such as cache poisoning and man-in-the middle attacks. If communication sessions are not provided appropriate validity protections, such as the employment of DNSSEC, the authenticity of the data cannot be guaranteed. | ||||
| STIG | Date | |||
| F5 BIG-IP TMOS DNS Security Technical Implementation Guide | 2024-09-09 | |||
Details
Check Text (C-265990r1024864_chk)
If the BIG-IP is transferring zones from another non-BIG-IP DNS server perform the following.
From the BIG-IP GUI:
1. DNS.
2. Zones.
3. Click on the Zone Name.
4. Under the TSIG section verify a "Server Key" is selected.
From the BIG-IP Console, type the following commands:
tmsh list ltm dns zone <name> server-tsig-key
Note: Must return a value other than "none".
If the BIG-IP appliance is not configured to protect the authenticity of communications sessions for zone transfers, this is a finding.
Fix Text (F-69816r1024863_fix)
From the BIG-IP GUI:
1. DNS.
2. Zones.
3. Click on the Zone Name.
4. Under the TSIG section, select a "Server Key" from the drop-down menu.
5. Click "Update".
From the BIG-IP Console, type the following commands:
tmsh modify ltm dns zone <zone name> server-tsig-key <TSIG key name>
tmsh save sys config