Nextcloud DoS via Unrestricted Display Names (Fixed 22.2.10/23.0.7/24.0.3)
CVE-2022-39346 Published on November 25, 2022
Missing length validation of user displayname in nextcloud server
Nextcloud server is an open source personal cloud server. Affected versions of nextcloud server did not properly limit user display names which could allow a malicious users to overload the backing database and cause a denial of service. It is recommended that the Nextcloud Server is upgraded to 22.2.10, 23.0.7 or 24.0.3. There are no known workarounds for this issue.
Vulnerability Analysis
CVE-2022-39346 is exploitable 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 have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Types
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2022-39346 has been classified to as a Resource Exhaustion vulnerability or weakness.
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2022-39346
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Affected Versions
nextcloud security-advisories:- Version < 22.2.10 is affected.
- Version >= 23.0.0, < 23.0.7 is affected.
- Version >= 24.0.0, < 24.0.3 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.