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Wednesday, 29 July 2015 / Published in Woo on Tech

Most Android devices impacted by critical vulnerability

Android in the crosshairs again

Due to a vulnerability in Android’s implementation of MMS, nearly one billion smartphones and tablets could be impacted by a security weakness known as Stagefright. In a nutshell, an attacker exploiting this vulnerability could send an MMS message with an infected attachment that could literally take over your device without you knowing it. Even though Google has released a fix for this vulnerability none of the major carriers and manufacturers have pushed the update to the affected devices, including Google’s own Nexus devices, which are due to be patched next week.

What this means for you:

This vulnerability can affect you even if you don’t open an infected MMS attachment, which could appear as a picture, movie or just about anything that can be attached to an SMS message. Stagefright’s actual purpose is to provide you with the thumbnail preview of the attachment in your SMS application, so having the attachment appear while scrolling through your messages would be enough to get infected. Regardless of what app you use to view MMS messages on your Android device, the only way to combat this attack is to prevent your device from automatically downloading MMS attachments. In Google’s default SMS application Hangouts, this is accomplished by doing the following:

  1. With Hangouts open, tap the Menu icon (3 horizontal lines in a stack) in the upper left corner.
  2. Tap the “Settings” icon (looks like a gear)
  3. Tap “SMS” (usually at the bottom of the list, below “Add Google Account”)
  4. Scroll down to “Auto retrieve MMS” and uncheck that box.

    Disable auto retrieve MMS

If you aren’t using Hangouts to view your SMS and MMS, make sure you check with the software developers to find out if disabling this option is possible in their app. I was previously using ChompSMS as my messaging app, and this option was NOT available, so I immediately switched back to Hangouts.

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Tagged under: Android, bug, exploit, Google, hangouts, mms, security, sms, stagefright, vulnerability

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