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    CVE-2021-42835

    An issue was discovered in Plex Media Server through 1.24.4.5081-e362dc1ee. An attacker (with a foothold in a endpoint via a low-privileged user account) can access the exposed RPC service of the update service component. This RPC functionality allows the attacker to interact with the RPC functionality and execute code from a path of his choice (local, or remote via SMB) because of a TOCTOU race condition. This code execution is in the context of the Plex update service (which runs as SYSTEM).

    Published:Dec 8, 2021
    Last Modified:Nov 21, 2024
    EPS:Dec 8, 2021
    EPSS Score:0.16914
    CVSS Score:7

    Affected Products

    Vendor
    Microsoft
    Product
    Windows
    Vendor
    Plex
    Product
    Media Server

    Exploits

    https://ir-on.io/2021/12/02/local-privilege-plexcalation/https://ir-on.io/2021/12/02/local-privilege-plexcalation/https://github.com/netanelc305/PlEXcalaison

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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