#VU76591 Improper Restriction of Excessive Authentication Attempts in Nextcloud Server and Nextcloud Enterprise Server - CVE-2023-32319

Vulnerability identifier: #VU76591

Vulnerability risk: Medium

CVSSv4.0: 6.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-32319

CWE-ID: CWE-307

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 attacker to compromise the target system.

The vulnerability exists due to missing brute force protection on the WebDAV endpoints. A remote user can brute-force user credentials when the provided user name is not an email address.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 24.0.0 - 25.0.4

Nextcloud Enterprise Server: 23.0.0 - 25.0.4

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External links
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mr7q-xf62-fw54
https://github.com/nextcloud/server/pull/37227

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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.