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.

• CWE-59

• http://lists.opensuse.org/opensuse-updates/2018-02/msg00109.htmlMailing List, Third Party Advisory
• http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
• http://www.openwall.com/lists/oss-security/2018/01/29/3Exploit, Mailing List, Third Party Advisory
• https://github.com/systemd/systemd/issues/7736Exploit, Issue Tracking, Third Party Advisory
• 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.htmlMailing List, Third Party Advisory
• https://www.exploit-db.com/exploits/43935/Exploit, Third Party Advisory, VDB Entry
• https://www.openwall.com/lists/oss-security/2018/01/29/4Mailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-updates/2018-02/msg00109.htmlMailing List, Third Party Advisory
• http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
• http://www.openwall.com/lists/oss-security/2018/01/29/3Exploit, Mailing List, Third Party Advisory
• https://github.com/systemd/systemd/issues/7736Exploit, Issue Tracking, Third Party Advisory
• 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.htmlMailing List, Third Party Advisory
• https://www.exploit-db.com/exploits/43935/Exploit, Third Party Advisory, VDB Entry
• https://www.openwall.com/lists/oss-security/2018/01/29/4Mailing List, Third Party Advisory

Published

Jan 29, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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