Nextcloud Desktop Client E2E File Recovery (v3.0.0-3.6.5)
CVE-2023-28997 Published on April 4, 2023
Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files
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.
Vulnerability Analysis
CVE-2023-28997 can be exploited with physical access, requires user interaction and user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
Reusing a Nonce, Key Pair in Encryption
Nonces should be used for the present occasion and only once.
Products Associated with CVE-2023-28997
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Affected Versions
nextcloud security-advisories Version >= 3.0.0, < 3.6.5 is affected by CVE-2023-28997Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.