CVE-2017-18078
First published: Mon Jan 29 2018(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Systemd Project Systemd | <237 | |
| Debian Debian Linux | =8.0 | |
| openSUSE Leap | =42.3 |
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Reference Links
- 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@%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%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
- 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
Frequently Asked Questions
What is CVE-2017-18078?
CVE-2017-18078 is a vulnerability in systemd-tmpfiles in systemd before version 237 that allows local users to bypass access restrictions and escalate privileges.
What is the severity of CVE-2017-18078?
CVE-2017-18078 has a severity score of 7.8, which is considered high.
Which software versions are affected by CVE-2017-18078?
Systemd version up to 237, Debian Linux version 8.0, and openSUSE Leap version 42.3 are affected by CVE-2017-18078.
How does CVE-2017-18078 work?
CVE-2017-18078 allows local users to bypass access restrictions by exploiting ownership/permission changes on hardlinked files.
Are there any references related to CVE-2017-18078?
Yes, you can find more information about CVE-2017-18078 at the following links: 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.
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