BlackBerry Enterprise Service < 12.4 (BES12) Self-Service - Multiple Vulnerabilities
( , ) (, . '.' ) ('. ', ). , ('. ( ) ( (_,) .'), ) _ _, / _____/ / _ \ ____ ____ _____ \____ \==/ /_\ \ _/ ___\/ _ \ / \ / \/ | \\ \__( <_> ) Y Y \ /______ /\___|__ / \___ >____/|__|_| / \/ \/.-. \/ \/:wq (x.0) '=.|w|.=' _=''"''=. presents.. BlackBerry Enterprise Service 12 (BES12) Self-Service Affected versions: BES12 < 12.4 CVE: CVE-2016-1914 and CVE-2016-1915 PDF: http://security-assessment.com/files/documents/advisory/Blackberry%20BES12%20Self-Service%20Multiple%20Vulnerabilities.pdf +-----------+ |Description| +-----------+ Blackberry BES12 is an enterprise mobile management solution and contains a self-service web application available to mobile users. This web application contains multiple vulnerabilities including unauthenticated SQL injection and reflected cross site scripting. Limited access to an on-premise BES12 environment was provided during the discovery of these vulnerabilities. The full impact of the vulnerabilities in relation to compromising other portions of the BES12 solution, such as mobile devices, is unclear. +------------+ |Exploitation| +------------+ *SQL Injection* The Java servlet com.rim.mdm.ui.server.ImageServlet is vulnerable to SQL injection via the imageName parameter. This servlet is exposed at multiple paths and is used to fetch an image from the database: /mydevice/client/image /admin/client/image /myapps/client/image /ssam/client/image /all/client/image This was discovered on a production BES12 on-premise deployment and the injection vector allowed both UNION and stacked queries to be executed on the Microsoft SQL server used by BES12. This allows full read/write access to the database, and can potentially result in command execution via xp_cmdshell depending on the database user configuration. The following proof of concept demonstrates an injection payload which will select the entire obj_keystore_entry table. The query will serialise the entire table into an XML document which is returned in the HTTP response as UTF-16 without the leading BOM (byte order mark) causing most text editors to fail to display the response correctly. https://<server>/mydevice/client/image?imageName=ui.cobranded.login.logo'+UNION+ALL+SELECT+NULL,NULL,NULL,NULL,NULL,(SELECT+*+FROM+obj_keystore_entry+FOR+XML+PATH(''))+-- The technique above can be used to download any database table available to the BES12 database user. Notable database tables are: * obj_user which contains BES12 user details. * obj_user_authentication which contains authentication tokens. * obj_user_device which based on column names, contains enrolment tokens, enrolment secrets and device encryption keys. It is unclear if this information is sufficient to decrypt a lost/stolen BES12 mobile device. *Reflected Cross Site Scripting* Two areas of the self-service web application exist where user-supplied input is reflected directly in web pages, allowing a malicious user to conduct Cross Site Scripting (XSS) attacks against users of the application. While the application uses the HttpOnly cookie flag for session tokens, successful exploitation allows malicious JavaScript to perform any action within the application that the targeted user is able to. The administrative web application is typically hosted on the same domain and may be attacked using these XSS vectors, although this is BES12 deployment specific. The table below details where Cross Site Scripting was detected and which parameters are vulnerable: https://<server>/mydevice/index.jsp?locale="><script>alert(1)</script> https://<server>/mydevice/loggedOut.jsp?locale="><script>alert(1)</script> +----------+ | Solution | +----------+ Upgrade to BES12.4. +-------------------+ |Disclosure Timeline| +-------------------+ Initial disclosure to Blackberry – 19 Nov 2015 Disclosure receipt confirmed by Blackberry – 19 Nov 2015 Request for update from Blackberry – 7 Dec 2015 Vulnerabilities confirmed by Blackberry – 8 Dec 2015 Blackberry confirms fixes will be released as part of BES12.4 – 28 Jan 2016 BES12.4 released – 29 Jan 2016 Advisory released – 15 Feb 2016 +-----------------------------+ |About Security-Assessment.com| +-----------------------------+ Security-Assessment.com is a leading team of Information Security consultants specialising in providing high quality Information Security services to clients throughout the Asia Pacific region. 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