Feeds

Citigroup says its iPhone app puts customers at risk

Warning: contents include account details

Build a business case: developing custom apps

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 essential guide to IT transformation

More from The Register

next story
Rupert Murdoch says Google is worse than the NSA
Mr Burns vs. The Chocolate Factory, round three!
Microsoft cries UNINSTALL in the wake of Blue Screens of Death™
Cache crash causes contained choloric calamity
Germany 'accidentally' snooped on John Kerry and Hillary Clinton
Dragnet surveillance picks up EVERYTHING, USA, m'kay?
Know what Ferguson city needs right now? It's not Anonymous doxing random people
U-turn on vow to identify killer cop after fingering wrong bloke
e-Borders fiasco: Brits stung for £224m after US IT giant sues UK govt
Defeat to Raytheon branded 'catastrophic result'
Snowden on NSA's MonsterMind TERROR: It may trigger cyberwar
Plus: Syria's internet going down? That was a US cock-up
Who needs hackers? 'Password1' opens a third of all biz doors
GPU-powered pen test yields more bad news about defences and passwords
Think crypto hides you from spooks on Facebook? THINK AGAIN
Traffic fingerprints reveal all, say boffins
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
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.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.