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[Security-announce] pfSense-SA-17_09.webgui

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pfSense-SA-17_09.webgui                                     Security Advisory
                                                                      pfSense

Topic:          Multiple XSS vulnerabilities in the WebGUI Dashboard

Category:       pfSense Base System
Module:         webgui
Announced:      2017-11-14
Credits:        Quentin Rhoads-Herrera, Security Researcher
Affects:        pfSense software version 2.4.x, <= 2.4.1
Corrected:      2017-10-24 19:50:56 UTC (pfSense/master, pfSense 2.4)

0.   Revision History

v1.0  2017-11-14 Initial SA draft

I.   Background

pfSenseĀ® software is a free network firewall distribution based on the
FreeBSD operating system.  The pfSense software distribution includes third-
party free software packages for additional functionality, and provides most of
the functionality of common commercial firewalls.

The majority of users of pfSense software have never installed or used a stock
FreeBSD system.  Unlike similar GNU/Linux-based firewall distributions, there
is no need for any UNIX knowledge.  The command line is never used, and there
is no need to ever manually edit any rule sets. Instead, pfSense software
includes a web interface for the configuration of all included components.
Users familiar with commercial firewalls will quickly understand the web
interface, while those unfamiliar with commercial-grade firewalls may encounter
a short learning curve.

II.  Problem Description

Cross-Site Scripting (XSS) vulnerabilities were found in the dashboard and
widgets, components of the pfSense software WebGUI, on version 2.4.1 and earlier
of the 2.4.x release branch.

* On index.php, the "sequence" parameter component for multiple widget instance
  counters was not validated and it was echoed back to the user directly without
  encoding. A specially-crafted submission could store an invalid widget
  sequence which could be used as an XSS vector.

* On numerous widgets which support multiple instances, the widgetkey parameter
  was taken from $_REQUEST and echoed back to the user directly without
  encoding, which could be used as an XSS vector.

III. Impact

Due to the lack of proper encoding on the affected variable susceptible to XSS,
arbitrary JavaScript can be executed in the user's browser. The user's session
cookie or other information from the session may be compromised.

IV.  Workaround

No workaround.

V.   Solution

Upgrade to pfSense software version 2.4.2 or a later version. This upgrade may
be performed in the web interface or from the console.

   See https://doc.pfsense.org/index.php/Upgrade_Guide

VI.  Correction details

The following list contains the correction revision numbers for each
affected item.

Branch/path                                                      Revision
- - -------------------------------------------------------------------------
pfSense/master                     7b973ceb6f72e22ee1b335128fb8d7f655c82879
                                   e3907730bdcc879f968d5d917ec9ac6567518e58
- - -------------------------------------------------------------------------

VII. References

<URL:https://doc.pfsense.org/index.php/Upgrade_Guide>

The latest revision of this advisory is available at
<URL:https://pfsense.org/security/advisories/pfSense-SA-17_09.webgui.asc>
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