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Stagefright: new Android vulnerability dubbed ‘heartbleed for mobile’

A major security flaw in Android lets an attacker take control of a phone simply by sending a text message – and for the vast majority of Android users, there’s no fix available yet.

Even the small number of people using Google’s own line of Android phones, sold under the Nexus brand, are vulnerable to some effects of the bug, according to Joshua Drake, the researcher who discovered the flaw.

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The weakness affects a part of the Android operating system, called Stagefright, that lets phones and tablets display media content. A maliciously crafted video can be used to deliver a program that will run on the phone as soon as it is processed by Stagefright, potentially letting an attacker do anything from reading and delete data to spy on the owner through their camera and microphone.

Worse, Google’s messaging app Hangouts automatically pre-processes videos when they’re received to cut down the delay if the user wants to watch them straight away. That means that if the video is sent as an MMS message, it can take over the phone “before the sound that you’ve received a message has even occurred,” Drake told NPR.

Even with Android’s default messaging app, the user has to view the message to trigger the Stagefright vulnerability. In neither case, the user actually has to play the video to be the victim of the hack. But in newer versions of the Android operating system, Google says that users are protected from the worst effects of the bug.

Chris Wysopal, the chief information security officer for app security specialists Veracode, called the flaw “Heartbleed for mobile,” referring to the widespread bug that put hundreds of thousands of websites at risk of hacking in April 2014. Wysopal said bugs that severe “are exceedingly rare and pose a serious security issue for users.”

Drake revealed details of the bug to Google in April and provided the company with patches for the errors – in theory, enough to ensure that users are never put at risk from the bug. He negotiated a 90-day embargo before he went public, giving the company a long headway to ship a fix to users (Google’s in-house security researchers, Project Zero, apply the same 90-day warning to other vendors when they find bugs in products from companies such as Apple and Microsoft).

But the coder’s revelation has also highlighted a long-standing security problem with Android, which is the speed with which fixes for software errors filter down to end-users. Google, which makes the Android operating system, has no power to push patches to most Android phones produced by other companies such as HTC, LG, or Samsung. Those companies frequently have to negotiate with mobile network operators to send patches to the end-user.

On top of that, only the newest Android phones receive patches, which means that the Stagefright bug – which affects the Android operating system all the way back to 2010’s version 2.2 – may never be fixed for a huge number of phones still in use.

Veracode’s Wysopal said that “it will be exciting to see how Google responds to this. They’ll have to drive the patch quickly and in a manner that impacts every affected device simultaneously. Waiting for handset manufacturers or carriers to issue a patch would be problematic since it could take a month or more before each party issues a patch.

“This would leave a big window for an attacker to reverse engineer the first patch issued by whichever party to create an exploit that would impact any device. We’re likely to see Google force down a tool that addresses the vulnerability for everyone.”

In a statement, Google said: “This vulnerability was identified in a laboratory setting on older Android devices, and as far as we know, no one has been affected. As soon as we were made aware of the vulnerability, we immediately sent a fix to our partners to protect users.

“As part of a regularly scheduled security update, we plan to push further safeguards to Nexus devices starting next week. And, we’ll be releasing it in open source when the details are made public by the researcher at BlackHat.”

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