#VU103061 Improper Authentication in Nextcloud Server and Nextcloud Enterprise Server - CVE-2024-52518

Vulnerability identifier: #VU103061

Vulnerability risk: Low

CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-52518

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Server
Client/Desktop applications / Messaging software
Nextcloud Enterprise Server
Client/Desktop applications / Messaging software

Vendor: Nextcloud

Description

The vulnerability allows a remote user to bypass authentication process.

The vulnerability exists due to missing password confirmation when changing external storage options. A remote administrator can bypass authentication process and gain access to the session of a user or administrator.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 28.0.0 - 30.0.1

Nextcloud Enterprise Server: 28.0.0 - 30.0.1

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External links
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-vrhf-532w-99rg
https://github.com/nextcloud/server/pull/48373
https://github.com/nextcloud/server/pull/48788
https://github.com/nextcloud/server/pull/48992
https://hackerone.com/reports/2602973

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.