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pfsense-rules-if-xss — pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - firewall_rules GET if | Kitploit
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GitHubabraxas/pfsense-rules-if-xss

pfsense-rules-if-xss

pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - firewall_rules GET if

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15 days agoNot yet reviewed

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Abraxas Labs - pfsense-rules-if-xss

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

pfsense-rules-if-xss

Class: XSS Reach: Remote

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

firewall_rules.php GET if= interpolates into value="" and iface = "" when requirefirewallinterface is on. Unknown if is replaced with lan when require is off.

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
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 127.0.0.1:19140.

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

What an attacker can do

MethodSinkPrivilege
GET firewall_rules.php?if=value="" and JS iface = ""Integrity: Lab-proven: quote-break raw in the hidden attr and JS string.
same leftoversame sinkRecon: Inferred: victim csrf-magic / same-origin GUI. Cookie httponly SameSite=Strict.
same leftoversame sinkAvailability: None shown.

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

Requires: page-firewall-rules. 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

Other $if hrefs and Location use htmlspecialchars. require-off replaces unknown if. Unauth N/A.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19140. Compose project pfsense-rules-if-xss. Witness PFSENSE-RULES-IF-XSS-WITNESS. Loopback only: 127.0.0.1:19140. Compose project pfsense-rules-if-xss. Witness PFSENSE-RULES-IF-XSS-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-RULES-IF-XSS control-inert=yes trigger-attr=yes trigger-js=yes PFSENSE-RULES-IF-XSS-WITNESS

Fix

htmlspecialchars($if, ENT_QUOTES) in both sinks. Allowlist if against configured interfaces.

References

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