Apple says that it is "currently working on resolving" an issue causing it to send corrupt app updates to Mac and iOS device owners, in news that exposes a chink in Apple’s normally impenetrable app ecosystem. The fault has affected a range of apps including Angry Birds and Yahoo! Search, causing them to crash. Apple is now attributing the issue to a "server that generated DRM code” and advising users to delete and re-install affected apps. Apple’s malfunction, a malicious app titled Find and Call has been discovered by security firm Kaspersky. The app, available in both Apple’s App Store and Google Play, claims to help organise a users’ phonebook, but instead sends spam to their address book via SMS.