#VU19544 Improper Privilege Management in ownCloud Server

Vulnerability identifier: #VU19544

Vulnerability risk: Medium

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

CVE-ID: N/A

CWE-ID: CWE-269

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ownCloud Server
Web applications / Modules and components for CMS

Vendor: ownCloud

Description

The vulnerability allows a remote attacker to gain elevated privileges.

The vulnerability exists due to the possibility to extend internal-share permissions using the API. A remote authenticated attacker can extend the permission of a received internal-share using the ocs-api and gain elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ownCloud Server: 1.0 - 10.2.0

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External links
https://owncloud.org/security/advisories/possibility-to-extend-internal-share-permissions-using-the-api2/
https://github.com/owncloud/core/commit/4ae39f7c70bb26e55d7396184da5c30dd75980a3

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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.