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The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

CVE-2023-28997 is a cryptographic vulnerability classified under CWE-323, involving the reuse of a nonce and key pair in the encryption mechanism of the Nextcloud Desktop Client. This client software synchronizes files between a user's device and the Nextcloud Server, supporting end-to-end encryption to protect file confidentiality and integrity. Versions from 3.0.0 up to but not including 3.6.5 are affected. The flaw allows a malicious server administrator—who inherently has high privileges on the server—to exploit the nonce reuse to recover plaintext contents of encrypted files and modify them undetected. This breaks the fundamental guarantees of end-to-end encryption, exposing sensitive data and enabling tampering. The attack requires user interaction, likely in the form of synchronization actions, and leverages the server's ability to manipulate encrypted data streams due to the cryptographic misuse. The vulnerability was publicly disclosed on April 4, 2023, with no known exploits in the wild at the time. The CVSS 3.1 base score is 6.7, indicating a medium severity level, with an attack vector of 'physical or local' (AV:P), low attack complexity, high privileges required on the server (PR:H), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable one, impacting confidentiality and integrity fully but not availability. The recommended remediation is upgrading the Nextcloud Desktop Client to version 3.6.5 or later, which contains the patch addressing nonce reuse. No alternative mitigations or workarounds are currently known.

Detailed information about CVE-2023-28997: CWE-323: Reusing a Nonce, Key Pair in Encryption in nextcloud security-advisories affecting nextcloud security-adviso

CVE-2023-28997: CWE-323: Reusing a Nonce, Key Pair in Encryption in nextcloud security-advisories - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-28997: CWE-323: Reusing a Nonce, Key Pair in Encryption in nextcloud security-advisories

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