Improper access control in Nextcloud Office

1) Improper access control

EUVDB-ID: #VU72077

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-25150

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to improper access restrictions when accessing files. A remote user can trick Collabora into reusing a valid access token to obtain files that belong to other application users.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Office: 3.0.1 - 7.0.1

CPE2.3

• cpe:2.3:a:nextcloud:office:3.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:3.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:3.2.4:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:3.3.15:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:3.4.6:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:3.5.3:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:3.6.0:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:3.7.19:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:3.8.6:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:office:4.0.4:*:*:*:*:*:*:*

External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-64xc-r58v-53gj
https://hackerone.com/reports/1788222
https://github.com/nextcloud/richdocuments/pull/2669

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.