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    CVE-2021-32728

    The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.3.0, the Nextcloud Desktop client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. This issue is fixed in Nextcloud Desktop Client version 3.3.0. There are no known workarounds aside from upgrading.

    Published:Aug 18, 2021
    Last Modified:Nov 21, 2024
    EPS:Aug 18, 2021
    EPSS Score:0.0045
    CVSS Score:6.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Nextcloud
    Product
    Desktop

    Exploits

    https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5https://hackerone.com/reports/1189162https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5https://hackerone.com/reports/1189162

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High