A DHCP server is configured on an internet-facing zone
At a glance
Base severity
Area
Platform
Evidence level
Benchmark reference
Reads the export, not the device
ConfigProof reads a configuration export. This control is evaluated against the objects in that file, and it reports what the file says. It does not connect to the device and sees no traffic, so a finding here describes the configuration, not what the firewall is doing right now.
Why it matters
A DHCP server configured on a segment the organization does not control is set to offer addresses, a gateway and DNS servers to any host there, including devices nobody vetted.
How to fix it
Web interface
The steps below are written for the web interface. A finding raised on your own export carries the same steps with your object names filled in.
- Disable the DHCP server on this interface, or move it to the internal segment it was meant for, under Network, DHCP.
Command line
PAN-OS CLI
set network dhcp interface <object-name> server mode disabledAn example. Values in angle brackets are yours to supply; a finding on your own export fills in the names it read. Nothing here commits. Review the candidate configuration, then commit it yourself.
Read it back
show network dhcp interface <object-name>Values to fill in1
- <object-name>
- The object's name, as it appears on your firewall
How to confirm the fix
- Confirm no lease is issued on the interface after the change.
Limits
- The zone is judged internet facing from its name only.
- A server whose mode is not written is recorded rather than judged, because the file does not state the default it runs with. In auto mode PAN-OS stops serving when it sees another DHCP server on the segment, which a configuration does not record.
Compliance references
No benchmark recommendation is mapped to this control in this version.
See it on your own firewall
One complete analysis of one firewall costs nothing. A card is required and nothing is charged.