Information disclosure in ownCloud Server

1) Incorrect Use of Privileged APIs

EUVDB-ID: #VU25684

Risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-648 - Incorrect Use of Privileged APIs

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to all file-versions of a user.

The vulnerability exists due to the incorrect usage of privileged APIs. A remote authenticated attacker on the local network can access all versions of all files (even unshared) as soon as the owner of said files has at least one outgoing share with the attacker.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ownCloud Server: 10.0.9 - 10.3.0

External links

http://owncloud.org/security/advisories/access-to-all-file-versions-of-a-user-as-soon-as-he-has-one-share-with-the-attacker/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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