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pfsense-acb-restore-priv — pfSense CE 2.9.0-DEVELOPMENT - High - Remote - Privilege leftover - ACB restore | Kitploit
Tools/GitHubGitHub/abraxas/pfsense-acb-restore-priv
Privilege EscalationVulnerability AnalysisExploitationWeb Application ExploitationWeb SecurityPenetration TestingLabs & Practice
GitHubabraxas/pfsense-acb-restore-priv

pfsense-acb-restore-priv

pfSense CE 2.9.0-DEVELOPMENT - High - Remote - Privilege leftover - ACB restore

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4 days agoNot yet reviewed

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Abraxas Labs - pfsense-acb-restore-priv

abraxaslabs.tech  ·  github.com/abraxas  ·  @abraxas_null  ·  [email protected]  ·  pfsense-acb-restore-priv

pfsense-acb-restore-priv

Class: Privilege leftover Reach: Remote

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

newver downloads, decrypts with the stored ACB password, config_restore. Optional userkey is another device's backup set. Local backup/history pages are warn-root.

IDno CVE yet
ClassPrivilege leftover
ReachRemote (authenticated WebGUI unless noted)
CWECWE-269
CVSSHigh: 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
ProductpfSense CE
Affected2.9.0-DEVELOPMENT (9363ac5b8651a1c7a333180425ce7719070f95f9)
AuthWebGUI session with page-services-acb
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 127.0.0.1:19040.

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

What an attacker can do

MethodSinkPrivilege
GET/POST services_acb.php newver=acb_backup_get / decrypt / config_restoreIntegrity: Lab-proven: newver restore replaced config.xml with the planted revision. Restore without newver did not.
same leftoversame sinkRecon: Inferred: same page can view/download decrypted ACB XML; userkey can select another device set.
same leftoversame sinkAvailability: Inferred: restore UI offers reboot; planted config can lock out the GUI.

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

Requires: page-services-acb. 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

diag_backup.php / diag_confbak.php warn-root.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19040. Compose project pfsense-acb-restore-priv. Witness PFSENSE-ACB-RESTORE-PRIV-WITNESS. Loopback only: 127.0.0.1:19040. Compose project pfsense-acb-restore-priv. Witness PFSENSE-ACB-RESTORE-PRIV-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-ACB-RESTORE-PRIV ident-no-warn-root=yes no-newver-no-restore=yes newver-restore=yes PFSENSE-ACB-RESTORE-PRIV-WITNESS

Fix

Mark page-services-acb standard-warning-root.

References

  • github.com/pfsense/pfsense 9363ac5b8651a1c7a333180425ce7719070f95f9
  • CWE-269
  • Series: https://abraxaslabs.tech/research/pfsense-ce-leftovers
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