#VU27957 Authorization bypass through user-controlled key in Nextcloud Server


Published: 2020-05-18

Vulnerability identifier: #VU27957

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8154

CWE-ID: N/A

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Server
Client/Desktop applications / Messaging software

Vendor: Nextcloud

Description

The vulnerability allows a remote attacker to wipe devices of other users.

The vulnerability exists due to insecure direct object reference in Nextcloud Server. A remote attacker can send specially crafted request directory to the affected endpoint and remotely wipe devices of other users.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 18.0.0 - 18.0.2


External links
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00037.html
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00038.html
http://hackerone.com/reports/819807
http://nextcloud.com/security/advisory/?id=NC-SA-2020-018


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.


Latest bulletins with this vulnerability