Security Advisory - Curesec Research Team 1. Introduction
Affected Product: pfsense 2.3.2 Fixed in: 2.3.3 Fixed Version Link: https://pfsense.org/download/ Vendor Website: https://www.pfsense.org/ Vulnerability Type: XSS Remote Exploitable: Yes Reported to vendor: 02/06/2017 Disclosed to public: 03/24/2017 Release mode: Coordinated Release CVE: requested via DWF Credits Tim Coen of Curesec GmbH 2. Overview pfsense is an open source firewall. The web interface is written in PHP. In version 2.3.2-RELEASE (amd64), it is vulnerable to reflected XSS. XSS can lead to disclosure of cookies, session tokens etc. 3. Details XSS 1 CVSS: Medium; 6.1 https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/ PR:N/UI:R/S:C/C:L/I:L/A:N Description: When performing a package reinstall via the package manager, the "from" and "to" parameter are vulnerable to reflected XSS. Proof of Concept: http://192.168.178.60/pkg_mgr_install.php?mode=reinstallpkg&pkg= pfSense-pkg-arping&from='"><img src=no onerror=alert(1)>&to='"><img src=no onerror=alert(1)> Note that while the "pkg" parameter must be a valid package, it does not need to actually be installed on the system. Code: pkg_mgr_install.php <?=sprintf(gettext('Confirmation Required to upgrade package %1$s from %2$s to %3$s.'), $pkgname, $_GET['from'], $_GET['to'])?> XSS 2 CVSS: Medium; 4.7 https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/ PR:N/UI:R/S:C/C:L/I:L/A:N Description: The pkg_filter Parameter of the pkg.php file is vulnerable to reflected XSS. It should be noted that the xml Parameter must point to an existing xml file, which must contain a field with the type sorting and the include_filtering_inputbox tag set. According to the vendor, the FreeRADIUS package is affected. Proof of Concept: 192.168.10.150/pkg.php?xml=miniupnpd.xml&pkg_filter='"><img src=no onerror= alert(1)> Code: pkg.php echo " Filter text: <input id='pkg_filter' name='pkg_filter' value='" . $_REQUEST['pkg_filter'] . "' /> <input type='submit' value='Filter' />"; 4. Solution To mitigate this issue please upgrade at least to version 2.3.3: https://pfsense.org/download/ Please note that a newer version might already be available. 5. Report Timeline 02/06/2017 Informed Vendor about Issue 02/07/2017 Vendor confirms + fixes issues in git 02/20/2017 Vendor relases fix + vendor advisory 03/24/2017 Disclosed to public Blog Reference: https://www.curesec.com/blog/article/blog/pfsense-232-XSS-197.html -- blog: https://www.curesec.com/blog Atom Feed: https://www.curesec.com/blog/feed.xml RSS Feed: https://www.curesec.com/blog/rss.xml tweet: https://twitter.com/curesec Curesec GmbH Curesec Research Team Josef-Orlopp-Straße 54 10365 Berlin, Germany _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
