Nextcloud Server ext storage update flaw 25.0.0-27.1.3
CVE-2023-48239 Published on November 21, 2023
Nextcloud Server users can make external storage mount points inaccessible for other users
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 Analysis
CVE-2023-48239 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and a high impact on availability.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2023-48239 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2023-48239
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Affected Versions
nextcloud security-advisories:- Version >= 25.0.0, < 25.0.13 is affected.
- Version >= 26.0.0, < 26.0.8 is affected.
- Version >= 27.0.0, < 27.1.3 is affected.
- Version >= 20.0.0, < 20.0.14.16 is affected.
- Version >= 21.0.0, < 21.0.9.13 is affected.
- Version >= 22.0.0, < 22.2.10.15 is affected.
- Version >= 23.0.0, < 23.0.12.12 is affected.
- Version >= 24.0.0, < 24.0.12.8 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.