March 12, 2014 weblog
WhatsApp for Android hole may expose chat history
"With this question my brother and I started an interesting conversation which ended in underneath proof of concept. The tldr [sic] answer is: "Yes, that is possible."
Those lines are from the question-and-answer posed on a Tuesday blog posting, with a closing line that "Facebook didn't need to buy WhatsApp to read your chats." The post sparked off numerous news headlines by Wednesday. Bass Bosschert, who identifies himself on the blog as consultant, system admin, and entrepreneur, was talking about WhatsApp for Android, which has a vulnerability, he said, that exposes a database of whatsapp messages. He wrote, "The WhatsApp database is saved on the SD card which can be read by any Android application if the user allows it to access the SD card. And since [sic] majority of the people allows everything on their Android device, this is not much of a problem."
His presentation showed a flaw that could expose a WhatsApp chat history in the Android version. The reported flaw would involve another application being able to upload a user's database of chats to a third-party server. TechCrunch remarked that it appeared to be "a problem with Android's data sandboxing system," and calling it "predominantly an Android security issue," an "infrastructure issue for Android more than a gaping security flaw on the part of WhatsApp." The Guardian chimed, that "Android's part in the weakness comes from the fact that the operating system only allows all-or-nothing access to the SD card. Any application which can read and write to the external storage can thus also read what other applications have stored there."
By comparison, said TechCrunch, Apple does not permit access to data outside of an app's own sandbox. That is Apple's way of preventing mischief makers with developer skills to tinker with a potential victim's data through a dummy app.
One impractical solution would be to send chats that comment only on the weather and local traffic. Business Insider's more practical advice: "Security breaches such as the one outlined in Bosschert's post can be easily avoided by verifying an app's source and carefully reading an app's permissions before installing."
WhatsApp is an instant messaging app recently purchased by Facebook. This is a cross-platform mobile messaging app which allows the exchange of messages, available for iPhone, BlackBerry, Android, Windows Phone and Nokia.
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