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pfsense-cp-filename-xss — pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - CP filename stored XSS | Kitploit
Tools/GitHubGitHub/abraxas/pfsense-cp-filename-xss
Vulnerability AnalysisExploitationWeb Application ExploitationWeb SecurityPenetration Testing
GitHubabraxas/pfsense-cp-filename-xss

pfsense-cp-filename-xss

pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - CP filename stored XSS

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4 days agoNot yet reviewed

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Abraxas Labs - pfsense-cp-filename-xss

abraxaslabs.tech  ·  github.com/abraxas  ·  @abraxas_null  ·  [email protected]  ·  pfsense-cp-filename-xss

pfsense-cp-filename-xss

Class: XSS Reach: Remote

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

Filename interpolates into / CSS url(...) on default login HTML with no encode. Portal origin is not the GUI origin. SA-26_05 is the GUI widget.

IDno CVE yet
ClassXSS
ReachRemote (authenticated WebGUI unless noted)
CWECWE-79
CVSSMedium: 6.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
ProductpfSense CE
Affected2.9.0-DEVELOPMENT (9363ac5b8651a1c7a333180425ce7719070f95f9)
AuthWebGUI session with plant with page-services-captiveportal-filemanager; victim is an unauth portal client
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 127.0.0.1:19110.

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

What an attacker can do

MethodSinkPrivilege
POST file-manager name, then unauth GET portal login HTMLget_default_captive_portal_html img src={$logo_src}Integrity: Inferred: script on the portal login can read auth_user / auth_pass on that page.
same leftoversame sinkRecon: Lab-proven: raw onerror= plus witness in unauth portal HTML. GUI list htmlspecialchars encoded the same name.
same leftoversame sinkAvailability: None shown.

Requires: plant with page-services-captiveportal-filemanager; victim is an unauth portal client. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Requires: plant with page-services-captiveportal-filemanager; victim is an unauth portal client. 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

GUI cookies. File-manager list encode. SA-26_05 widget.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19110. Compose project pfsense-cp-filename-xss. Witness PFSENSE-CP-FILENAME-XSS-WITNESS. Loopback only: 127.0.0.1:19110. Compose project pfsense-cp-filename-xss. Witness PFSENSE-CP-FILENAME-XSS-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-CP-FILENAME-XSS control-inert=yes trigger-raw=yes witness-unescaped=yes gui-cookie-theft=no PFSENSE-CP-FILENAME-XSS-WITNESS

Fix

htmlspecialchars the filename in portal HTML. Restrict upload charset.

References

  • github.com/pfsense/pfsense 9363ac5b8651a1c7a333180425ce7719070f95f9
  • CWE-79
  • Series: https://abraxaslabs.tech/research/pfsense-ce-leftovers
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