Improper access control in ownCloud Server

1) Improper access control

EUVDB-ID: #VU25682

Risk: Low

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

CVE-ID: N/A

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. A remote attacker who knows the public-link hash and the original filename of the image can bypass implemented security restrictions and gain unauthorized access to the preview-image of a password-protected public-link.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ownCloud Server: 10.3.0 - 10.3.2

CPE2.3

• cpe:2.3:a:owncloud:owncloud_server:10.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:owncloud:owncloud_server:10.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:owncloud:owncloud_server:10.3.2:*:*:*:*:*:*:*

External links

https://owncloud.org/security/advisories/public-link-password-bypass-via-image-previews/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.