Telegram's MacOS flaw allows it to recover deleted messages - ICSS


Trustwave Spider Labs Lead Threat Architect -Reegun Richard Jayapaul, identified the issue in Telegram MacOS's Self-Destruct feature, which is part of the messaging app's Secret-Chats feature that uses end-to-end encryption.

Jayapaul reported a bug in macOS Telegram version 7.5 that causes any shared location, music, video, or documents transferred via the app to be preserved in the Telegram cache under the path:“/Users/Admin/Library/GroupContainers/”.


The Secret-Chat is saved in this directory with the prefix "secret-file-xxxxxx." “Any media files submitted to Telegram, except attachments, are downloaded by default to the aforesaid cache folder,” he explained in the article. Locations that have been shared are saved in the form of an image.

Jayapaul described two situations in which the issue might be exploited: one in which both the sender and the recipient of the messages or locations' privacy is violated, and the other in which only the sender's privacy is violated

Someone sends a voice recording, video message, or photograph, or exposes his or her location in the first scenario, and then turns on the "self-destruct" option. According to how the feature works, once the receiver reads the message, it is removed. “However, the files are still available for retrieval locally inside the cache folder,” Jayapaul stated.

The second option relies on the message recipient going into the cache folder to retrieve the self-destructing file, or deleting the messages without reading them in the Telegram app. According to the post, the sender will never know if the message was read, and the recipient will keep a permanent copy of the material.

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