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pfsense-dhcpd-conf — pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - Config injection - ISC dhcpd filename | Kitploit
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GitHubabraxas/pfsense-dhcpd-conf

pfsense-dhcpd-conf

pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - Config injection - ISC dhcpd filename

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Abraxas Labs - pfsense-dhcpd-conf

abraxaslabs.tech  ·  github.com/abraxas  ·  @abraxas_null  ·  [email protected]  ·  pfsense-dhcpd-conf

pfsense-dhcpd-conf

Class: Config injection Reach: Remote

pfSense CE 2.9.0-DEVELOPMENT (9363ac5) - pfsense.org

services_dhcpdv4_configure interpolates filename "{$sm['filename']}"; with no addslashes. GUI stores $_POST['filename'] with no quote/newline gate. Kea JSON is SA-26_20 skip.

IDno CVE yet
ClassConfig injection
ReachRemote (authenticated WebGUI unless noted)
CWECWE-74
CVSSMedium: 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
ProductpfSense CE
Affected2.9.0-DEVELOPMENT (9363ac5b8651a1c7a333180425ce7719070f95f9)
AuthWebGUI session with page-services-dhcpserver-editstaticmapping
LicenseGNU Affero GPL v3.0
Lab127.0.0.1 only

I pinned public master 9363ac5. The lab is a PHP gadget of the pinned sink, loopback HTTP on 127.0.0.1:19250.

Series write-up: https://abraxaslabs.tech/research/pfsense-ce-leftovers

What an attacker can do

MethodSinkPrivilege
POST services_dhcp_edit.php filenamefilename "{$sm['filename']}";Integrity: Lab-proven: extra option tftp-server-name in chroot conf. Filename never reached argv.
same leftoversame sinkRecon: None shown.
same leftoversame sinkAvailability: Inferred: parse-fail dhcpd or extra PXE option.

Requires: page-services-dhcpserver-editstaticmapping. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Requires: page-services-dhcpserver-editstaticmapping. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Adjacent surface that stays closed

Host shell. Files outside the chroot. Kea JSON. hostname charset. numberoptions text quotes.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19250. Compose project pfsense-dhcpd-conf. Witness PFSENSE-DHCPD-CONF-WITNESS. Loopback only: 127.0.0.1:19250. Compose project pfsense-dhcpd-conf. Witness PFSENSE-DHCPD-CONF-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-DHCPD-CONF control-one-filename=yes trigger-extra-statement=yes PFSENSE-DHCPD-CONF-WITNESS

Fix

addslashes / reject quote and newline in filename/rootpath/ldap/DUID.

References

  • github.com/pfsense/pfsense 9363ac5b8651a1c7a333180425ce7719070f95f9
  • CWE-74
  • Series: https://abraxaslabs.tech/research/pfsense-ce-leftovers
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