Vulnerability Details : CVE-2018-6954
Potential exploit
systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.
Products affected by CVE-2018-6954
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:42.3:*:*:*:*:*:*:*
- cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-6954
0.13%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 29 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-6954
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2018-6954
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-6954
-
https://usn.ubuntu.com/3816-1/
USN-3816-1: systemd vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b@%3Cissues.bookkeeper.apache.org%3E
Third Party Advisory
-
https://github.com/systemd/systemd/issues/7986
tmpfiles: symlinks are followed in non-terminal path components (CVE-2018-6954) · Issue #7986 · systemd/systemd · GitHubExploit;Issue Tracking;Patch;Third Party Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html
[security-announce] openSUSE-SU-2019:1450-1: important: Security updateThird Party Advisory
-
https://usn.ubuntu.com/3816-2/
USN-3816-2: systemd vulnerability | Ubuntu security noticesThird Party Advisory
-
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%3Cissues.bookkeeper.apache.org%3E
[GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 - Pony MailThird Party Advisory
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