Nextcloud Server Shares Overwrite Same Name in 24.x/25.x (CVE-2023-28643)
CVE-2023-28643 Published on March 30, 2023
Potential share collision for recipients when caching is enabled in nextcloud server
Nextcloud server is an open source home cloud implementation. In affected versions when a recipient receives 2 shares with the same name, while a memory cache is configured, the second share will replace the first one instead of being renamed to `{name} (2)`. It is recommended that the Nextcloud Server is upgraded to 25.0.3 or 24.0.9. Users unable to upgrade should avoid sharing 2 folders with the same name to the same user.
Vulnerability Analysis
CVE-2023-28643 can be exploited with network access, requires user interaction and a 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 be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Type
Use of Incorrectly-Resolved Name or Reference
The software uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere.
Products Associated with CVE-2023-28643
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Affected Versions
nextcloud security-advisories:- Version < 24.0.9 is affected.
- Version >= 25.0.0, < 25.0.3 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.