Nextcloud Desktop Client <3.6.5: Full Decrypt of E2E Encrypted Folder
CVE-2023-28998 Published on April 4, 2023
Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys
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 gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure, and add new files.? Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.
Vulnerability Analysis
CVE-2023-28998 is exploitable 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
Missing Cryptographic Step
The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm.
Products Associated with CVE-2023-28998
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Affected Versions
nextcloud security-advisories Version >= 3.0.0, < 3.6.5 is affected by CVE-2023-28998Exploit 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.