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pfsense-separator-color-xss — pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - separator color into class | Kitploit
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GitHubabraxas/pfsense-separator-color-xss

pfsense-separator-color-xss

pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - separator color into class

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4 days agoNot yet reviewed

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Abraxas Labs - pfsense-separator-color-xss

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

pfsense-separator-color-xss

Class: XSS Reach: Remote

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

display_separator() concatenates $separator['color'] into class="..." with no encode. order-store copies POST separator with no color whitelist. Text is htmlspecialchars.

IDno CVE yet
ClassXSS
ReachRemote (authenticated WebGUI unless noted)
CWECWE-79
CVSSMedium: 5.4 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 page-firewall-rules or page-firewall-nat-portforward order-store
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 127.0.0.1:19160.

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

What an attacker can do

MethodSinkPrivilege
POST firewall_rules.php order-store separator colordisplay_separator class="...{$separator['color']}..."Integrity: Lab-proven: quote-break raw in class= on three interpolations. NAT reorder is the same sink.
same leftoversame sinkRecon: Inferred: stored XSS in the GUI origin.
same leftoversame sinkAvailability: None shown.

Requires: page-firewall-rules or page-firewall-nat-portforward order-store. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Requires: page-firewall-rules or page-firewall-nat-portforward order-store. 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

Text encode. UI colors bg-info/danger/success/warning. String-row helper JS does not match row/0.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19160. Compose project pfsense-separator-color-xss. Witness PFSENSE-SEPARATOR-COLOR-XSS-WITNESS. Loopback only: 127.0.0.1:19160. Compose project pfsense-separator-color-xss. Witness PFSENSE-SEPARATOR-COLOR-XSS-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-SEPARATOR-COLOR-XSS control-class=yes trigger-unescaped=yes text-encoded=yes string-row-closed=yes nat-same-sink=yes PFSENSE-SEPARATOR-COLOR-XSS-WITNESS

Fix

Allowlist separator color. htmlspecialchars in class=.

References

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