Improper access control in Nextcloud Server and Enterprise Server



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-25821
CWE-ID CWE-284
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Nextcloud Server
Client/Desktop applications / Messaging software

Nextcloud Enterprise Server
Client/Desktop applications / Messaging software

Vendor Nextcloud

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper access control

EUVDB-ID: #VU72577

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-25821

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions within download permissions. A remote user can can circumvent secure view for internal shares.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 24.0.4 - 25.0.0

Nextcloud Enterprise Server: 24.0.4 - 25.0.0

CPE2.3 External links

https://hackerone.com/reports/1724016
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w6h-5qgw-4j94
https://github.com/nextcloud/server/pull/34502


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.



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