Improper Preservation of Permissions in Nextcloud Server and Enterprise Server

1) Improper Preservation of Permissions

EUVDB-ID: #VU74118

Risk: Low

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

CVE-ID: CVE-2023-25817

CWE-ID: CWE-281 - Improper preservation of permissions

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the system.

The vulnerability exists due to improper preservation of permissions. A remote user can delete files they are not supposed to deletable but only viewed or downloaded.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 24.0.0 - 24.0.8

Nextcloud Enterprise Server: 24.0.0 - 24.0.8

CPE2.3

• cpe:2.3:a:nextcloud:nextcloud_server:24.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_server:24.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_server:24.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:24.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:24.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:24.0.2:*:*:*:*:*:*:*

External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8v5c-f752-fgpv
https://github.com/nextcloud/server/pull/33941

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.