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Xamarin for Android <5.1 DLL Hijack Vulnerability

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xamarin for Android prior to version 5.1 allows to replace internal DLL files inside the APK with files on SD card which are not in a secure storage. Malicious application without any special permissions could drop backdoored DLL files into /storage/sdcard0/Android/data/app_id/files/.__override__/ and the victim application would use files from SD. Not just the main application library could be hijacked, but also Xamarin's System.dll and Mono.Android.dll, which are shipped in all Xamarin for Android applications. Developers should rebuild their applications using Xamarin for Android 5.1 or newer in the release mode. This vulnerability was found by accident, which allowed me to eat for free for a month. Timeline: 03.04.2015 Vulnerability is found 07.04.2015 Message sent to Xamarin 08.04.2015 Xamarin acknowledged the vulnerability 29.04.2015 Fixed stable version released -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 Comment: https://keybase.io/valdikss iQIcBAEBCAAGBQJVWz98AAoJEFzXIC7viPdyP3wP/3Vxrc0hHZATTfkCVq688sJa /NI2Z7cdRf3cpHSLCciWbtcNK82uE6qmHisFwUQGA5xvljhrkAXLPa2xG3wShmXq G5ID3WexMWgTfLqYwOi/4fq1jpfeEg5vpDFAhj0JuWAvZg1zOwFBQ7UdT6G/eu1C +Dgmk1qpvLcPkKOrh2i4xwqkDfqNfADfK7ekjeqMZe70tC95eHLeRWzVEmi+hCC3 zLwnuprHOEQ/CGeKiQJzePExARFyIfS/kuV+YPdw14gmEOwKAfFymuaxYqULqaxS H6RdUJp2SZT5cf0RSlA7zqPhX8fqnkiBiCpd8BstoANl+dFvnggVks6PWovBm8aW huYqscwDZ0pGG8kV5lPO/9fE2P/1nm9B1h9tOcycD8gpM7inbDy6WoETwO0KZOlx qsetTdYt4PA5V6Wn6wks4R9iPZy7bFlqzrGWLWFY9FYV7a0cZoDi7eY8bNhxFj/T g3M1ruIIRVxriyFjcfmq2nWw0rMFhiaDdb/GuQEmtN8b2CQRQmiBrvP1uC2zkOhW ijdYsN7SMjvLTch3n6TU3ycibB0uEp03Jgm2+wRzZj5VQXUHR7BFzhh74UeeAriT K7EialPddQzxPFS0ufTGQ1JFfjJP3bgZFLDwbJVt/WLwsgQpLmXcTjHub56lr87y xQmqbzDDykOJ92uZEJ4X =vW6d -----END PGP SIGNATURE----- _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/

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