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CVE-2017-18078

7.8 · HIGH

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 bypa…

Published Jan 29, 2018CWE-59EPSS 1.06%

Overview

CVE-2017-18078 is a high-severity vulnerability. It was published on January 29, 2018 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-updates/2018-02/msg00109.htmlRefpacketstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.htmlRefwww.openwall.com/lists/oss-security/2018/01/29/3GitHubgithub.com/systemd/systemd/issues/7736Reflists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3EReflists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3EReflists.debian.org/debian-lts-announce/2019/04/msg00022.htmlRefwww.exploit-db.com/exploits/43935/Refwww.openwall.com/lists/oss-security/2018/01/29/4Reflists.opensuse.org/opensuse-updates/2018-02/msg00109.html

How CyberStrike helps

Frequently asked questions

What is CVE-2017-18078?

CVE-2017-18078 is a high-severity vulnerability. It was published on January 29, 2018 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2017-18078?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2017-18078?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-18078?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-18078 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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