Charging Mobile Devices Could Put Data at Risk
Smartphones can be compromised when charged using a standard USB connection hooked up to a computer, Kaspersky Lab has discovered in a proof-of-concept experiment.
Woburn, MA – May 26, 2016 – Smartphones can be compromised when charged using a standard USB connection hooked up to a computer, Kaspersky Lab has discovered in a proof-of-concept experiment. The researchers are now evaluating what the impact of such an incident might be.
Have you ever wondered how safe your smartphone and data are when you connect the device to freely available charging points at airports, cafes, parks and public transport? Do you know what, and how much data your mobile device is exchanging with these points while it’s charging? Kaspersky Lab researchers decided to conduct research on the topic.
As part of this experiment, they tested a number of smartphones running various versions of Android and iOS operating systems in order to understand what data the device transfers externally while connected to a PC or Mac for charging. The test results indicate that the mobile phones reveal a lot of data to the computer during the ‘handshake’ (an introduction process between the device and the PC/Mac it is connected to), including: the device name, device manufacturer, device type, serial number, firmware information, operating system information, file system/file list, and electronic chip ID. The amount of data sent during the handshake varies depending on the device and the host, but each smartphone transfers the same basic set of information, like device name, manufacturer, and serial number.
As a result, the device can serve as a unique identifier for any third party who might be interested in collecting data for subsequent use. Indirectly, this can be a security issue since cybercriminals can do much more with a device connected to an unknown computer or charging device.
Back in 2014, a concept was presented at Black Hat that a mobile phone could be infected with malware simply by plugging it into a fake charging station. Now, two years after the original announcement, Kaspersky Lab has been able to successfully reproduce the result. Using just a regular PC and a standard micro USB cable, armed with a set of special commands (so-called AT-commands), they were able to re-flash a smartphone and silently install a root application on it. This amounts to a total compromise of the smartphone, even though no malware was used.
Although information about actual incidents involving fake charging stations has not been published, the theft of data from mobile phones connected to a computer has been observed in the past. For example, this technique was used in 2013 as part of the cyberespionage campaign Red October, and the Hacking Team group also made use of a computer connection to load a mobile device with malware.
Both of these threat actors found a way to exploit the supposedly safe initial data exchange between the smartphone and the PC it was connected to. By checking the identification data received from the connected device, the hackers were able to discover what device model the victim was using and to progress their attack with a specifically-chosen exploit. That would not have been as easy to achieve if smartphones did not automatically exchange data with a PC automatically upon connecting to the USB port.
“It is strange to see that nearly two years after the publication of a proof-of-concept demonstrating how a smartphone can be infected though the USB, the concept still works. The security risks here are obvious: if you’re a regular user you can be tracked through your device IDs; your phone could be silently packed with anything from adware to ransomware; and, if you’re a decision-maker in a big company, you could easily become the target of professional hackers,” – warns Alexey Komarov, researcher at Kaspersky Lab. “And you don’t even have to be highly-skilled in order to perform such attacks, all the information you need can easily be found on the Internet,” he concludes.
In order to protect yourself from the risk of possible attack through unknown charging points and untrusted computers, Kaspersky Lab advises the following:
· Use only trusted USB charging points and computers to charge your device;
· Protect your mobile phone with a password and don’t unblock it while charging;
· Use encryption technologies and secure containers (protected areas on mobile devices used to isolate sensitive information) to protect the data;
· Protect both your mobile device and your PC/Mac from malware with the help of a proven security solution. This will help to detect malware even if a “charging” vulnerability is used.
To learn more, read the blog post available at Securelist.com.
About Kaspersky Lab
Kaspersky Lab is one of the world’s fastest-growing cybersecurity companies and the largest that is privately-owned. The company is ranked among the world’s top four vendors of security solutions for endpoint users (IDC, 2014). Since 1997 Kaspersky Lab has been an innovator in cybersecurity and provides effective digital security solutions and threat intelligence for large enterprises, SMBs and consumers. Kaspersky Lab is an international company, operating in almost 200 countries and territories across the globe, providing protection for over 400 million users worldwide.
Learn more at www.kaspersky.com.
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