Exploiting smart-phone USB connectivity for fun and profit

The Universal Serial Bus (USB) connection has become the de-facto standard for both charging and data transfers for smart phone devices including Google's Android and Apple's iPhone. To further enhance their functionality, smart phones are equipped with programmable USB hardware and open source operating systems that empower them to alter the default behavior of the end-to-end USB communications. Unfortunately, these new capabilities coupled with the inherent trust that users place on the USB physical connectivity and the lack of any protection mechanisms render USB a insecure link, prone to exploitation. To demonstrate this new avenue of exploitation, we introduce novel attack strategies that exploit the functional capabilities of the USB physical link. In addition, we detail how a sophisticated adversary who has under his control one of the connected devices can subvert the other. This includes attacks where a compromised smart phone poses as a Human Interface Device (HID)...

• Type: Journal
• Year: 2010
• Where: ACSAC
• Authors: Zhaohui Wang, Angelos Stavrou
• Keywords: ACSAC 2010, Programmable Usb Hardware, Security Privacy, Smart Phone, Smart Phone Device