Privilege escalation in ownCloud

Published: 2019-07-29

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	N/A
CWE-ID	CWE-269
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	ownCloud Server Web applications / Modules and components for CMS
Vendor	ownCloud

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper privilege management

EUVDB-ID: #VU19532

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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 - Improper Privilege Management

Exploit availability: No

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 attacker can extend the permission of a received subfolder share using the ocs api and gain elevated privileges. Additional risk exists because the privileged extension is also possible on public-shares.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ownCloud Server: 1.0 - 10.2.0

CPE2.3

External links

https://owncloud.org/security/advisories/possibility-to-extend-internal-share-permissions-using-the-api/
https://github.com/owncloud/core/commit/c93eca49c32428ece03dd67042772d5fa62c8d6e

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.

2) Improper Privilege Management

EUVDB-ID: #VU19544