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pfsense-ntp-gps-fudge — pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - Config injection - NTP GPS/PPS fudge | Kitploit
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GitHubabraxas/pfsense-ntp-gps-fudge

pfsense-ntp-gps-fudge

pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - Config injection - NTP GPS/PPS fudge

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14 days agoNot yet reviewed

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Abraxas Labs - pfsense-ntp-gps-fudge

abraxaslabs.tech  ·  github.com/abraxas  ·  @abraxas_null  ·  [email protected]  ·  pfsense-ntp-gps-fudge

pfsense-ntp-gps-fudge

Class: Config injection Reach: Remote

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

system.inc concatenates GPS/PPS fudge/refid/stratum into ntpd.conf. mwexec is ntpd -c of that path.

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-ntpd-gps / page-services-ntpd-pps
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 127.0.0.1:19230.

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

What an attacker can do

MethodSinkPrivilege
POST services_ntpd_gps.php gpsfudge1 / refid / stratumntpd.conf fudge 127.127.20.0 ...Integrity: Lab-proven: newline added extra ntpd language. Not shell.
same leftoversame sinkRecon: None shown.
same leftoversame sinkAvailability: Inferred: hostile ntpd.conf can fail time sync.

Requires: page-services-ntpd-gps / page-services-ntpd-pps. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Requires: page-services-ntpd-gps / page-services-ntpd-pps. 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

Not shell. mwexec argv is the conf path.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19230. Compose project pfsense-ntp-gps-fudge. Witness PFSENSE-NTP-GPS-FUDGE-WITNESS. Loopback only: 127.0.0.1:19230. Compose project pfsense-ntp-gps-fudge. Witness PFSENSE-NTP-GPS-FUDGE-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-NTP-GPS-FUDGE control-fudge0=yes trigger-extra-ntpd=yes not-shell=yes PFSENSE-NTP-GPS-FUDGE-WITNESS

Fix

Numeric/charset-check fudge/refid/stratum. Reject CR/LF.

References

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