Feeds

You've got Mail! But someone else is reading it in Outlook for Android

Researchers say Redmond forgot to encrypt messages stored on Android SD cards

The Essential Guide to IT Transformation

Researchers have plucked privacy holes in Microsoft's Outlook Android app that expose user data when user security setting screws were not tightened.

New York-based Include Security pointed out that Redmond's app, which has chalked up tens of millions of downloads, stored user data on the removable SD card that could be read by other applications.

"In the course of our research we found that the on-device email storage doesn't really make any effort to ensure confidentiality of messages and attachments within the phone filesystem itself," Include Security bod Paolo Soto said in a post.

"We've found that many messaging applications (stored email or instant message and chat apps) store their messages in a way that makes it easy for rogue apps or third parties with physical access to the mobile device to obtain access to the messages."

The security firm tested a string of apps and narrowed in on Outlook for what it identified as a series of privacy failures.

Soto said any third party app with the READ_EXTERNAL_STORAGE permission could access Outlook email attachments stored on the SD card for users who did not specifically encrypt card data or activate the private folders for devices operating Android 4.4.

Reading Outlook attachments did not require devices to be rooted, the company said, meaning an attacker with a stolen phone in hand could tap in with an ADB shell and open the sdcard/attachments folder.

Emails were stored but not encrypted within the app file system. Soto found the app's PIN code was below 'common user expectation' as it served merely as a locked gate and did not encrypt user data.

"We feel users should be aware of cases like this as they often expect that their phone's emails are 'protected' when using mobile messaging applications."

The privacy risks were reported to Microsoft which said Android users should encrypt data on their SD cards.

"Users should not assume data is encrypted by default in any application or operating system unless an explicit promise to that effect has been made," Redmond said.

The security firm recommended developers enable encryption in similar apps or transmit attachments as opaque binary blobs. ®

Build a business case: developing custom apps

More from The Register

next story
14 antivirus apps found to have security problems
Vendors just don't care, says researcher, after finding basic boo-boos in security software
'Things' on the Internet-of-things have 25 vulnerabilities apiece
Leaking sprinklers, overheated thermostats and picked locks all online
iWallet: No BONKING PLEASE, we're Apple
BLE-ding iPhones, not NFC bonkers, will drive trend - marketeers
Only '3% of web servers in top corps' fully fixed after Heartbleed snafu
Just slapping a patched OpenSSL on a machine ain't going to cut it, we're told
How long is too long to wait for a security fix?
Synology finally patches OpenSSL bugs in Trevor's NAS
Israel's Iron Dome missile tech stolen by Chinese hackers
Corporate raiders Comment Crew fingered for attacks
Tor attack nodes RIPPED MASKS off users for 6 MONTHS
Traffic confirmation attack bared users' privates - but to whom?
Roll out the welcome mat to hackers and crackers
Security chap pens guide to bug bounty programs that won't fail like Yahoo!'s
Researcher sat on critical IE bugs for THREE YEARS
VUPEN waited for Pwn2Own cash while IE's sandbox leaked
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Why and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
The Essential Guide to IT Transformation
ServiceNow discusses three IT transformations that can help CIO's automate IT services to transform IT and the enterprise.
Maximize storage efficiency across the enterprise
The HP StoreOnce backup solution offers highly flexible, centrally managed, and highly efficient data protection for any enterprise.