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pfsense-auth-username-xss — pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - LDAP username in head.inc | Kitploit
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GitHubabraxas/pfsense-auth-username-xss

pfsense-auth-username-xss

pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - LDAP username in head.inc

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14 days agoNot yet reviewed

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Abraxas Labs - pfsense-auth-username-xss

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

pfsense-auth-username-xss

Class: XSS Reach: Remote

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

head.inc logout title interpolates $_SESSION['Username'] raw. passwordmg Form_StaticText is also raw. Local charset rejects the trigger; LDAP names skip it.

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 LDAP/RADIUS WebGUI session
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 127.0.0.1:19170.

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

What an attacker can do

MethodSinkPrivilege
LDAP login with a quote-breaking usernamehead.inc logout title="Logout ({$_SESSION['Username']}@$system_url)"Integrity: Lab-proven: quote-break raw in logout HTML and StaticText.
same leftoversame sinkRecon: Lab-proven: session username reflected on every authed page that includes head.inc.
same leftoversame sinkAvailability: None shown.

Requires: LDAP/RADIUS WebGUI session. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Requires: LDAP/RADIUS WebGUI session. 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

Local [^a-zA-Z0-9.-_] charset. htmlspecialchars($system_url). Unauth N/A.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19170. Compose project pfsense-auth-username-xss. Witness PFSENSE-AUTH-USERNAME-XSS-WITNESS. Loopback only: 127.0.0.1:19170. Compose project pfsense-auth-username-xss. Witness PFSENSE-AUTH-USERNAME-XSS-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-AUTH-USERNAME-XSS control-admin-encoded=yes trigger-quote-break=yes witness-unescaped=yes local-charset-blocks-trigger=yes PFSENSE-AUTH-USERNAME-XSS-WITNESS

Fix

htmlspecialchars the session username in head.inc and passwordmg.

References

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