#VU14481 Improper authentication in Nextcloud Server - CVE-2018-3775

Vulnerability identifier: #VU14481

Vulnerability risk: Low

CVSSv4.0: 6.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-3775

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

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

Vendor: Nextcloud

Description

The disclosed vulnerability allows a remote attacker to bypass authentication on the target system.

The vulnerability exists due to improper authentication. A remote authenticated attacker that obtained user credentials can bypass the 2 Factor Authentication.

Mitigation
Update to version 12.0.3.

Vulnerable software versions

Nextcloud Server: 11.0.0 - 12.0.2

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External links
https://nextcloud.com/security/advisory/?id=NC-SA-2018-007

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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.