-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2017-018 Product: OTRS Manufacturer: OTRS Affected Version(s): OTRS 5.0.x, OTRS 4.0.x, OTRS 3.3.x Fixed Version(s): OTRS 5.0.20, OTRS 4.0.24, OTRS 3.3.17 Tested Version(s): 5.0.19 Vulnerability Type: Access to Installation Dialog Risk Level: High Solution Status: Fixed Manufacturer Notification: 2017-05-30 Solution Date: 2017-06-06 Public Disclosure: 2017-06-08 CVE Reference: CVE-2017-9324 Author of Advisory: Sebastian Auwarter, SySS GmbH ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: OTRS is a ticket management system. The manufacturer describes the product as follows (see [1]): "OTRS is one of the most flexible web-based ticketing systems used for Customer Service, Help Desk, IT Service Management. With a fast implementation and easy customization to your needs it helps you reducing costs and increasing the efficiency and transparency of your business communication." Due to insufficient checking of privileges, it is possible to access the OTRS Install dialog of an already installed instance, which enables an authenticated attacker to change the database settings, superuser password, mail server settings, log file location and other parameters. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: The recommended way to install OTRS is to use the installation dialog found at http://vulnerablehost/otrs/installer.pl. After successful installation, OTRS prevents further use of this installer. Any authenticated user can access the installation functionality of OTRS by referencing the installer via a crafted url. The URLs that can be used to access the installer can be one of the following: * http://vulnerablehost/otrs/index.pl?Action=Installer * http://vulnerablehost/otrs/index.pl?Action=Installer;Subaction=Intro * http://vulnerablehost/otrs/index.pl?Action=Installer;Subaction=Start * http://vulnerablehost/otrs/index.pl?Action=Installer;Subaction=System At the end of each "installation" step, the user is redirected to the start page. Therefore, the next step of the installation dialog must be called directly using the Intro, Start (Database) or System subaction, respectively. By Using the installer tool, an attacker can change a variety of parameters, including the superuser password, database settings, mail server settings, log file location and instance ID. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): On a newly installed instance of OTRS, logged in as any valid user, navigate to index.pl?Action=Installer;Subaction=Start to change the database parameters or to index.pl?Action=Installer;Subaction=System to get a superuser password. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: This vulnerability is fixed in the latest versions of OTRS, and it is recommended to upgrade to the latest patch level. Fixed releases can be found at: https://www.otrs.com/category/release-and-security-notes-en/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2017-05-30: Vulnerability discovered 2017-05-30: Vulnerability reported to manufacturer by project member 2017-06-06: Vulnerability reported to manufacturer via security advisory 2017-06-06: Fix provided by manufacturer 2017-06-06: Vulnerability disclosed by manufacturer 2017-06-08: Public release of the security advisory ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Product website for OTRS https://www.otrs.com/ [2] SySS Security Advisory SYSS-2017-018 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2017-018.txt [3] SySS Responsible Disclosure Policy https://www.syss.de/en/news/responsible-disclosure-policy/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Sebastian Auwarter of SySS GmbH. E-Mail: sebastian-auwaerter@syss.de Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Sebastian_Auwaerter.asc Key Fingerprint: F98C 3E12 6713 19D9 9E2F BE3E E9A3 0D48 E2F0 A8B6 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclaimer: The information provided in this security advisory is provided "as is" and without warranty of any kind. Details of this security advisory may be updated in order to provide as accurate information as possible. The latest version of this security advisory is available on the SySS Web site. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Copyright: Creative Commons - Attribution (by) - Version 3.0 URL: http://creativecommons.org/licenses/by/3.0/deed.en -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJZORr6AAoJEOmjDUji8Ki2Lt0P/iZ6DLr1ezWAhEHLxEdsrmGT OTpXaT3ANvvzWf4HH5NsIF/Q+kZAymNsW53MXxLJA0wZCj9t5cKR4UHptgd83W0h oNe3yOnYWPMf0L25PqNBy0wWVLLKL2Zme3xhSEYiEmbOCYERjr6IeX5td1i+PwwC wOkrYt/98o+XwtkMk25QyrQ0/IypNescPX2wj6zkOHkv0FcZUDsrAyOPFYBEyQ9q 7VUnNnUZlZK5h8hJZQ63c+5I/Ql5FxqtzPdkiZeYkj3oavaipWTKm2goCFzU8fA1 V1V5/ohQNd1Rk5sH+0NtC3KIMhbCA2hmH586jyDAgtZg6oRPXrHM4wFZE2SICKWy HeXIc1HUs6cvPFkFaxTNFL3Grb5NBuDBGxgwC7IQQ23pR3vYU3ckXC7UOj69sYSS bvGtcleYU17J7ND3YgQeVzMr58S/9i/mhZ/ya4WIGCp+9zh4YZiKzGK0PqFON+nn OQrQBLTwwTZz/VJJyWeaNWc7m4R4BXwi/BeYlAV3t51srWwCUV23NxDEXjKu4TZ7 0f93N0qYcSpVi0CIwPtA5IDTVNhOWSLzeco1zitJvDq5V9l4gbyAISXOFV12RxSh cduM6hUc6ALp1UziHQRpD8xUhFbF03WVysN5wHXrM9+d+TaVZ92KOaCv6VIWDVBh 63bQpoUQZ8L4LfzusTTl =EuyE -----END PGP SIGNATURE-----