Vulnerability Details : CVE-2023-48239
Potential exploit
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and starting in version 20.0.0 and prior to versions 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Enterprise Server, a malicious user could update any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud Server 25.0.13, 26.0.8, and 27.1.3 and Nextcloud Enterprise Server is upgraded to 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 contain a patch for this issue. As a workaround, disable app files_external. This workaround also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.
Vulnerability category: BypassGain privilege
Products affected by CVE-2023-48239
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 25.0.0 and before (<) 25.0.13cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 27.0.0 and before (<) 27.1.3cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 21.0.0 and before (<) 21.0.9.13cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 20.0.0 and before (<) 20.0.14.16cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 23.0.0 and before (<) 23.0.12.12cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 26.0.0 and before (<) 26.0.8cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 22.0.0 and before (<) 22.2.10.15cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 24.0.0 and before (<) 24.0.12.8cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-48239
0.23%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 44 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-48239
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.1
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H |
2.8
|
4.2
|
NIST | |
|
8.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H |
3.1
|
4.7
|
GitHub, Inc. |
CWE ids for CVE-2023-48239
-
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.Assigned by: security-advisories@github.com (Secondary)
References for CVE-2023-48239
-
https://github.com/nextcloud/server/pull/41123
fix(external): Get storage before update it by nickvergessen · Pull Request #41123 · nextcloud/server · GitHubPatch
-
https://hackerone.com/reports/2212627
HackerOneExploit
-
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f962-hw26-g267
Users can make external storage mount points inaccessible for other users · Advisory · nextcloud/security-advisories · GitHubVendor Advisory
Jump to