Vulnerability Details : CVE-2019-18837
An issue was discovered in crun before 0.10.5. With a crafted image, it doesn't correctly check whether a target is a symlink, resulting in access to files outside of the container. This occurs in libcrun/linux.c and libcrun/chroot_realpath.c.
Products affected by CVE-2019-18837
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
- cpe:2.3:a:crun_project:crun:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-18837
0.26%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 66 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-18837
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:N |
10.0
|
2.9
|
NIST | |
|
8.6
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
3.9
|
4.0
|
NIST |
CWE ids for CVE-2019-18837
-
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-2019-18837
-
https://github.com/containers/crun/pull/173
utils: if the path exists check if it a directory by giuseppe · Pull Request #173 · containers/crun · GitHubPatch
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ITB2UNEGHXZUR3ATYHWPSK5LJB36N7AP/
[SECURITY] Fedora 31 Update: crun-0.10.5-2.fc31 - package-announce - Fedora Mailing-ListsThird Party Advisory
-
https://github.com/containers/crun/releases/tag/0.10.5
Release 0.10.5 · containers/crun · GitHubRelease Notes
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DTA5SJUAKQUK6HRY2CZVJUIZP5BO3EOG/
[SECURITY] Fedora 30 Update: crun-0.10.5-2.fc30 - package-announce - Fedora Mailing-ListsThird Party Advisory
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