Vulnerability in Systemd Project
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Systemd Project
- Debian Linux — versions 8.0
- openSUSE Leap — versions 42.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.opensuse.org/opensuse-updates/2018-02/msg00109.html (vendor-advisory, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2018/01/29/3 (mailing-list, Exploit, Mailing List, Third Party Advisory)
- www.exploit-db.com/exploits/43935/ (Exploit, VDB Entry, Third Party Advisory, exploit)
- github.com/systemd/systemd/issues/7736 (Exploit, Third Party Advisory, Issue Tracking)
- packetstormsecurity.com/files/146184/systemd-Local-Privilege-Escalation.html (Exploit, VDB Entry, Third Party Advisory)
- www.openwall.com/lists/oss-security/2018/01/29/4 (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/04/msg00022.html (mailing-list, Mailing List, Third Party Advisory)
- lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a4508… (mailing-list)
- lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698… (mailing-list)
Frequently asked questions
- What is CVE-2017-18078?
- CVE-2017-18078 is a high-severity vulnerability in Systemd Project, classified under Improper Link Resolution Before File Access. CVSS score: 7.8/10. Published 2018-01-29.
- How severe is CVE-2017-18078?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2017-18078 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.