Improper privilege management in Nextcloud Server and Enterprise Server

1) Improper privilege management

EUVDB-ID: #VU103055

Risk: Low

CVSSv4.0: 0.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-52516

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

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

The vulnerability exists due to shares are not removed when user is limited to share with in their groups and being removed from one of them. A remote user can gain access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 28.0.0 - 29.0.4

Nextcloud Enterprise Server: 26.0.0 - 29.0.4

CPE2.3

• cpe:2.3:a:nextcloud:nextcloud_server:28.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_server:28.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_server:28.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:26.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:26.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:26.0.2:*:*:*:*:*:*:*

External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-35gc-jc6x-29cm
https://github.com/nextcloud/server/pull/47180
https://github.com/nextcloud/server/commit/142b6e313ffa9d3b950bcd23cb58850d3ae7cf34

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.