Martin Albrecht

The issue allows a malicious server administrator to recover and modify the contents of end-to-end encrypted files. This is a significant concern for users who rely on the Nextcloud Desktop Client for synchronizing files from Nextcloud Server.

A malicious server administrator can gain full access to an end-to-end encrypted folder, allowing them to decrypt files, recover the folder structure, and add new files.

A malicious server administrator can gain full access to an end-to-end encrypted folder, allowing them to decrypt files, recover the folder structure, and add new files.

Name of the Vulnerable Software and Affected Versions: iOS versions prior to 12.1 macOS Mojave versions prior to 10.14.1 tvOS versions prior to 12.1 watchOS versions prior to 5.1 iTunes versions prior to 12.9.1 iCloud for Windows versions prior to 7.8 Description: An issue existed in the method for determining prime numbers, which was addressed by using pseudorandom bases for testing of primes. Recommendations: For iOS versions prior to 12.1, update to iOS 12.1 or later. For macOS Mojave versions prior to 10.14.1, update to macOS Mojave 10.14.1 or later. For tvOS versions prior to 12.1, update to tvOS 12.1 or later. For watchOS versions prior to 5.1, update to watchOS 5.1 or later. For iTunes versions prior to 12.9.1, update to iTunes 12.9.1 or later. For iCloud for Windows versions prior to 7.8, update to iCloud for Windows 7.8 or later.