#VU74351 Use of Incorrectly-Resolved Name or Reference in Nextcloud Enterprise Server and Nextcloud Server - CVE-2023-28643

Vulnerability identifier: #VU74351

Vulnerability risk: Medium

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-28643

CWE-ID: CWE-706

Exploitation vector: Network

Exploit availability: No

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

Vendor: Nextcloud

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to use of incorrectly-resolved name or reference. A remote user can cause share collision for recipients when caching is enabled.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Enterprise Server: 24.0.0 - 25.0.2

Nextcloud Server: 24.0.0 - 25.0.2

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External links
https://github.com/nextcloud/server/issues/34015
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hhq4-4pr8-wm27
https://github.com/nextcloud/server/pull/36047

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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