CVE-2017-18078

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    CVE-2017-18078

    Published: 29 Jan 2018Last Modified: 7 Aug 2026

    Summary:

    Details: systemd-tmpfiles in systemd before 237 attempts to support ownership/permission changes on hardlinked files even if the fs.protected_hardlinks sysctl is turned off, which allows local users to bypass intended access restrictions via vectors involving a hard link to a file for which the user lacks write access, as demonstrated by changing the ownership of the /etc/passwd file.

    References: https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E, https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E, http://lists.opensuse.org/opensuse-updates/2018-02/msg00109.html, https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html, https://www.openwall.com/lists/oss-security/2018/01/29/4, https://github.com/systemd/systemd/issues/7736, http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.html, http://www.openwall.com/lists/oss-security/2018/01/29/3, https://www.exploit-db.com/exploits/43935/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -46659f7deb962f55c728e70597e37c2a3ab6326d

    Affected versions

    v236

    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
    CVE-2017-18078 | CVE-DB