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Vulnerability · Published Nov 21, 2023 · Assigned by GitHub_M

CVE-2023-48239Nextcloud Server users can make external storage mount points inaccessible for other users

High 8.5

In plain English

A high-severity improper access control in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities).

Severity (CVSS 3.1)8.5High
Exploit odds (30 days)0.9%top 38.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

VendorProductVersions
nextcloud security-advisories >= 25.0.0, < 25.0.13>= 26.0.0, < 26.0.8>= 27.0.0, < 27.1.3>= 20.0.0, < 20.0.14.16>= 21.0.0, < 21.0.9.13>= 22.0.0, < 22.2.10.15>= 23.0.0, < 23.0.12.12>= 24.0.0, < 24.0.12.8

Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

References