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Apple fixes bug that allowed FBI to read deleted Signal messages
TL;DR
Apple has fixed a security flaw that allowed the FBI to access deleted Signal messages. The bug allowed notifications marked for deletion to be unexpectedly retained on devices, which has now been addressed in the latest iOS update.
Key points
- Apple fixed a security flaw in iOS
- FBI could access deleted Signal messages
- Notifications marked for deletion were retained
- Signal confirmed the issue has been resolved
- End-to-end encryption may not ensure complete data protection
Mentioned in this story
AppleSignal
Tech giant Apple has fixed a security flaw that had allowed the FBI to access a Signal user’s deleted messages through their phone’s push notification database, despite the app being deleted and messages being set to disappear.
In a security advisory released on Wednesday, Apple said it had fixed a bug that allowed “notifications marked for deletion” to be “unexpectedly retained on the device.”
In an X post on Wednesday, Signal said the update fixed the issue that made a user’s messages retrievable by law enforcement.
"Apple's advisory confirmed that the bugs that allowed this to happen have been fixed in the latest iOS release," Signal said.
Signal uses end-to-end encryption to secure messages between its users. The bug is a reminder that messaging encryption may not be enough to keep data protected when using certain devices or operating systems.
Apple’s notes on the security patch. Source: Apple
FBI found a backdoor to private messages
This security flaw was first highlighted by independent technology news website 404 Media, which reported on April 9 that documents recently unsealed in Texas federal court related to an FBI case over an attack on the Prairieland ICE Detention Facility last July.
The court proceedings showed that the FBI was able to forensically extract a defendant's Signal messages from the iPhone's notification database, which contained cached, readable previews of incoming Signal messages even after disappearing messages were enabled and the app was deleted.
Q&A
What security flaw did Apple fix regarding Signal messages?
Apple fixed a flaw that allowed the FBI to access deleted Signal messages through the phone's push notification database.
How did the bug affect Signal's message deletion feature?
The bug caused notifications marked for deletion to be unexpectedly retained on the device, making deleted messages retrievable by law enforcement.
What did Signal say about the fix for the security issue?
Signal confirmed that Apple's advisory indicated the bugs allowing message retrieval by law enforcement have been fixed in the latest iOS release.
