Feeds

Citigroup says its iPhone app puts customers at risk

Warning: contents include account details

Securing Web Applications Made Simple and Scalable

Citigroup is urging customers who use their iPhones for online banking to immediately upgrade to a new version of the application because a security weakness in the the old one puts them at risk.

In a letter, the US banking giant said the Citi Mobile app saved user information in a hidden file that could be used by attackers to gain unauthorized access to online accounts. Personal information stored in the file could include account numbers, bill payments and security access codes, according to The Wall Street Journal, which reported the vulnerability earlier.

There are no reports of anyone exploiting the weakness, but Citi said it was possible someone could access the file either after it was saved onto an iPhone or when it was copied onto a PC or Mac after synchronizing with the Apple smartphone. The easiest way to read the file would be to gain physical access of a lost or stolen iPhone, but it might also be possible to get a hold of the information by exploiting a separate vulnerability on the handset or computer.

An update Citi issued last week securely deletes the file and prevents the mobile application from creating new ones in the future.

The incident is the latest to give smartphone users pause about the explosion of apps available for their mobile devices. Last week, Apple pulled a title from the iPhone App Store after discovering it contained a secret feature that allowed it to be used as a computer modem. If App store entries can include tethering, or other features forbidden by mobile operators, it may also be possible for to hide undocumented attack code that steals user data, security researchers have said. ®

The smart choice: opportunity from uncertainty

More from The Register

next story
Putin: Crack Tor for me and I'll make you a MILLIONAIRE
Russian Interior Ministry offers big pile o' roubles for busting pro-privacy browser
Mozilla fixes CRITICAL security holes in Firefox, urges v31 upgrade
Misc memory hazards 'could be exploited' - and guess what, one's a Javascript vuln
Manic malware Mayhem spreads through Linux, FreeBSD web servers
And how Google could cripple infection rate in a second
How long is too long to wait for a security fix?
Synology finally patches OpenSSL bugs in Trevor's NAS
Don't look, Snowden: Security biz chases Tails with zero-day flaws alert
Exodus vows not to sell secrets of whistleblower's favorite OS
Boffins build FREE SUPERCOMPUTER from free cloud server trials
Who cares about T&Cs when there's LIteCoin to mint?
Roll out the welcome mat to hackers and crackers
Security chap pens guide to bug bounty programs that won't fail like Yahoo!'s
prev story

Whitepapers

Top three mobile application threats
Prevent sensitive data leakage over insecure channels or stolen mobile devices.
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.
Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
Build a business case: developing custom apps
Learn how to maximize the value of custom applications by accelerating and simplifying their development.