UBUNTU-CVE-2018-6954

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    UBUNTU-CVE-2018-6954

    Published: 13 Feb 2018Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-6954

    Summary:

    Details: systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.

    References: https://ubuntu.com/security/CVE-2018-6954, https://ubuntu.com/security/notices/USN-3816-1, https://ubuntu.com/security/notices/USN-3816-2, https://www.cve.org/CVERecord?id=CVE-2018-6954

    Affected packages

    Package

    Name: systemd

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -229-4ubuntu21.15

    Affected versions

    225-1ubuntu9

    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