-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= pfSense-SA-25_06.webgui Security Advisory pfSense Topic: Stored XSS in IPsec Phase 1 Category: pfSense Base System Module: webgui Announced: 2025-05-16 Credits: Pablo Sanchez and Blanca Valencia of CovertSwarm Limited https://www.covertswarm.com/ Affects: pfSense Plus software versions < 25.03 pfSense CE software versions < 2.8.0 Corrected: 2025-04-01 14:26:41 UTC (pfSense Plus master, 25.07) 2025-04-01 16:03:54 UTC (pfSense Plus plus-RELENG_25_03, 25.03) 2025-04-01 14:26:41 UTC (pfSense CE master, 2.9.0) 2025-04-01 16:03:39 UTC (pfSense CE RELENG_2_8_0, 2.8.0) 0. Revision History v1.0 2025-05-16 Initial SA draft I. Background pfSense® 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. pfSense® Plus is the productized version of pfSense software from Netgate®, previously referred to as pfSense Factory Edition (FE). It is available to Netgate appliance and CSP customers. 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 A potential stored Cross-Site Scripting (XSS) vulnerability was identified in IPsec Phase 1 entries. The page at vpn_ipsec_phase1.php does not perform sufficient validation on interface values submitted by users when creating or editing IPsec Phase 1 entries. The vpn_ipsec.php page displays these stored interface values to the user without encoding, which is a potential XSS vector. This problem is present on pfSense Plus version 24.11, pfSense CE version 2.7.2, and earlier versions of both. III. Impact Due to the lack of encoding on the interface content, the IPsec Phase 1 list on vpn_ipsec.php is susceptible to XSS. Arbitrary JavaScript could be executed in the user's browser. The user's session cookie or other information from the session may be compromised. IV. Workaround To help mitigate the problem on older releases, use one or more of the following: * Limit access to the affected pages to trusted administrators only. * Do not grant users write access to the configuration unnecessarily. * Do not log into the firewall with the same browser used for non- administrative web browsing. V. Solution Users can upgrade to pfSense Plus software version 25.03 or later, or pfSense CE software versions after 2.8.0 when available. This upgrade may be performed in the web interface or from the console. See https://docs.netgate.com/pfsense/en/latest/install/upgrade-guide.html Users on pfSense Plus version 24.11 and pfSense CE version 2.7.2 may apply the fix from the recommended patches list in the System Patches package. Users may also manually apply the relevant revisions below using the System Patches package on earlier versions, or by manually making similar changes to the affected files if the patches do not apply directly. See https://docs.netgate.com/pfsense/en/latest/development/system-patches.html VI. Correction details The following list contains the correction revision commit ID for each affected item. Branch/path Revision - - ------------------------------------------------------------------------- plus/plus-master 0ff75cd0b9fb14c04c94c3585831a9f669be0a5d plus/plus-RELENG_25_03 ce81ec8b9dde0b7ee21fba72250a2b4ab65fca7f pfSense/master 0ff75cd0b9fb14c04c94c3585831a9f669be0a5d pfSense/RELENG_2_8_0 28ee7b400d5f2504a6098da6f961d81d029bde4e - - ------------------------------------------------------------------------- VII. References The latest revision of this advisory is available at -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE40XvjEU56XSUPIMdE7mH/ZIU+NoFAmgnYzYACgkQE7mH/ZIU +Nq1aRAAsp4toBhO00oTLUOZiKrRjGnKysWvG0DdXlbYHEYxSF5Eq4SrPW2IOp1D A6WSV1aHl+kiscdLHq5u85RoYA0550w30W0w28ugUfJMstlF1xGE3UxDSZswiCYK Cmq0JvPKkts3qHOZVT2Ebj8/5oT6p/Tabh619FDO2PVhRP8jzQVv/P8aS6B2GNYe yZ+mDyXf6ywNROC0DHOtsamiSxPQWY4AIcOQDpoLnv08JXZ1qh22X0UyDugfbgBQ huzXxOP6cnpNsBLA0gpY50FMcsmO1YWSaVi4BMg1yIEb200LLasdYptXOFsK5+io lw+edSkyNbUrhnTmS+awc87srrXbDMRp/84eY8IDcmAQyrlXYord59h4/0T4k71t LbSAhL5sMAymFfgJ20wlps/TbwurkxYbfiX5/4Uojg6T3MSWmO7JijL3IGQL871X pjyzabaU/CFy0WpMkWgjQK4M1PuV70wksWDIMGATcyhGQgG7jE1Smhc/BGUOexeP HSwFEPbtfz2j5lZYhQk27nZ6TurrHf3Qht0GLyYakPxb3Fr5Ads0E79fNwrafjzT RZUSlSISN0UCKLcX9aUVMZkzzkECWW1IOCdh55rJcJJpDvoE4V/0+OdiFp7LYFMz 4+/mCKHxSaYsJX3Ycjthk4x7zsh8PMiyAiVB1lZz5WwoUYK3p60= =ioBL -----END PGP SIGNATURE-----