Hackers use Android 'master key' exploit in China

Chinese app Symantec said the exploit has been added to two Chinese health apps

Related Stories

A security firm says it has identified the first known malicious use of Android's "master key" vulnerability.

The bug - which was first publicised earlier this month - allows attackers to install code on to phones running Google's mobile operating system and then take control of them.

Symantec said its researchers had found two apps distributed in China that had been infected using the exploit.

Google has already taken moves to tackle the problem.

A fortnight ago it released a patch to manufacturers, but it will not have been sent to all handset owners yet.

Google also scans its own Play marketplace for the exploit, but this will not protect consumers who download software from other stores.

Premium texts

The vulnerability was first reported by security research firm BlueBox on 3 July.

All Android apps contain an encrypted signature that the operating system uses to check the program is legitimate and has not been tampered with.

But BlueBox said it had found a way to make changes to an app's code without affecting the signature.

It warned the technique could be used to install a Trojan to read any data on a device, harvest passwords, record phone calls, take photos and carry out other functions.

According to Symantec, hackers have now exploited the flaw to install malware called Android.Skullkey, which steals data from compromised phones, monitors texts received and written on the handset, and also sends its own SMS messages to premium numbers.

It said the Trojan had been added to two legitimate apps used in China to find and make appointments with a doctor.

Android phones The fragmented nature of the Android market means updates take time before they become available

"We expect attackers to continue to leverage this vulnerability to infect unsuspecting user devices," its report warned.

"Symantec recommends users only download applications from reputable Android application marketplaces."

The firm added that affected users could manually remove the software by going into their settings menu.

One telecoms consultant said the news highlighted the difficulty Google had in distributing changes to Android.

"When Google releases its updates, manufacturers want to check them and then network operators also want to certify the code as well," said Ben Wood, director of research at CCS Insight.

"It's a consequence of having so many different firms making Android devices, with most running their own user interfaces on top.

"By contrast, Apple just pushes its updates directly to consumers."

More on This Story

Related Stories

The BBC is not responsible for the content of external Internet sites

More Technology stories

RSS

Features & Analysis

BBC Future

Digitised dollar bill

Surprising way to get rich online

Reddit founder’s new money-making scheme Read more...

Programmes

  • The Audi RS7Click Watch

    Tech news review of the week including a speed record for a self-driving car

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.