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Potential share collision for recipients when caching is enabled

Moderate
nickvergessen published GHSA-hhq4-4pr8-wm27 Mar 30, 2023

Package

Server (Nextcloud)

Affected versions

>= 24.0.0, >= 25.0.0

Patched versions

24.0.9, 25.0.3
Server (Nextcloud Enterprise)
>= 24.0.0, >= 25.0.0
24.0.9, 25.0.3

Description

Impact

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 … (2)

Patches

It is recommended that the Nextcloud Server is upgraded to 25.0.3 or 24.0.9.
It is recommended that the Nextcloud Enterprise Server is upgraded to 25.0.3 or 24.0.9.

Workarounds

Avoid sharing 2 folders with the same name to the same user.

References

For more information

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Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

CVE ID

CVE-2023-28643

Weaknesses