CVE-2017-18078

Public Exploit

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.20%
Vendor Advisory opensuse.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://lists.opensuse.org/opensuse-updates/2018-02/msg00109.html vendor advisory mailing list third party advisory
http://www.openwall.com/lists/oss-security/2018/01/29/3 mailing list third party advisory exploit
https://www.exploit-db.com/exploits/43935/ third party advisory vdb entry exploit
https://github.com/systemd/systemd/issues/7736 third party advisory issue tracking exploit
http://packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.html third party advisory vdb entry exploit
https://www.openwall.com/lists/oss-security/2018/01/29/4 third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html third party advisory mailing list
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E mailing list
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E mailing list

Frequently Asked Questions

What is the severity of CVE-2017-18078?
CVE-2017-18078 has been scored as a high severity vulnerability.
How to fix CVE-2017-18078?
To fix CVE-2017-18078, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-18078 being actively exploited in the wild?
It is possible that CVE-2017-18078 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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