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    CVE-2017-18078

    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.

    Published:Dec 24, 2017
    Last Modified:Nov 21, 2024
    EPS:Jan 29, 2018
    EPSS Score:0.00106
    CVSS Score:7.8

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Systemd Project
    Product
    Systemd

    Exploits

    http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.htmlhttp://www.openwall.com/lists/oss-security/2018/01/29/3https://github.com/systemd/systemd/issues/7736https://www.exploit-db.com/exploits/43935/http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.htmlhttp://www.openwall.com/lists/oss-security/2018/01/29/3https://github.com/systemd/systemd/issues/7736https://www.exploit-db.com/exploits/43935/https://www.exploit-db.com/exploits/43935

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    References

    http://lists.opensuse.org/opensuse-updates/2018-02/msg00109.html
    http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.html
    http://www.openwall.com/lists/oss-security/2018/01/29/3
    https://github.com/systemd/systemd/issues/7736
    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
    https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html
    https://www.exploit-db.com/exploits/43935/
    https://www.openwall.com/lists/oss-security/2018/01/29/4
    http://lists.opensuse.org/opensuse-updates/2018-02/msg00109.html
    http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.html
    http://www.openwall.com/lists/oss-security/2018/01/29/3
    https://github.com/systemd/systemd/issues/7736
    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
    https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html
    https://www.exploit-db.com/exploits/43935/
    https://www.openwall.com/lists/oss-security/2018/01/29/4

    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