Published: 29/01/2018 Updated: 07/11/2023

CVSS v2 Base Score: 4.6 | Impact Score: 6.4 | Exploitability Score: 3.9

CVSS v3 Base Score: 7.8 | Impact Score: 5.9 | Exploitability Score: 1.8

VMScore: 465

Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

systemd-tmpfiles in systemd prior to 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.

Vulnerable Product	Search on Vulmon	Subscribe to Product
systemd project systemd
debian debian linux 8.0
opensuse leap 42.3

systemd-tmpfiles in systemd before 237 attempts to support ownership/permission changes on hardlinked files even if the fsprotected_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 owners ...

Product: systemd (systemd-tmpfiles) Versions-affected: 236 and earlier Author: Michael Orlitzky Fixed-in: commit 5579f85 , version 237 Bug-report: githubcom/systemd/systemd/issues/7736 Acknowledgments: Lennart Poettering who, instead of calling me an idiot for not realizing that systemd enables fsprotected_hardlinks by default, went o ...

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CWE-59 https://github.com/systemd/systemd/issues/7736 https://www.exploit-db.com/exploits/43935/https://www.openwall.com/lists/oss-security/2018/01/29/4 http://www.openwall.com/lists/oss-security/2018/01/29/3 http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.html http://lists.opensuse.org/opensuse-updates/2018-02/msg00109.html https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E https://nvd.nist.gov https://github.com/blackberry/UBCIS https://www.exploit-db.com/exploits/43935/https://access.redhat.com/security/cve/cve-2017-18078

CVE-2017-18078

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