Vulnerability Details : CVE-2023-28833
Nextcloud server is an open source home cloud implementation. In affected versions admins of a server were able to upload a logo or a favicon and to provided a file name which was not restricted and could overwrite files in the appdata directory. Administrators may have access to overwrite these files by other means but this method could be exploited by tricking an admin into uploading a maliciously named file. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should avoid ingesting logo files from untrusted sources.
Vulnerability category: Directory traversal
Products affected by CVE-2023-28833
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 24.0.0 and before (<) 24.0.10cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 23.0.0 and before (<) 23.0.14cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 25.0.0 and before (<) 25.0.4cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-28833
0.16%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 54 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-28833
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST | |
|
2.4
|
LOW | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L |
0.9
|
1.4
|
GitHub, Inc. |
CWE ids for CVE-2023-28833
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by: security-advisories@github.com (Secondary)
-
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.Assigned by: nvd@nist.gov (Primary)
References for CVE-2023-28833
-
https://github.com/nextcloud/server/pull/36095
Limit key names when uploading theme images by PVince81 · Pull Request #36095 · nextcloud/server · GitHubIssue Tracking;Patch
-
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-ch7f-px7m-hg25
Ability to control the filename when uploading a logo or favicon as admin in the theming settings · Advisory · nextcloud/security-advisories · GitHubVendor Advisory
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