Vulnerability identifier: #VU14480

Vulnerability risk: Low

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-2018-3776

CWE-ID: CWE-20

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 security restrictions on the target system.

The vulnerability exists due to insufficient sanitization of user-supplied data passed to JSON encoder. A remote attacker can cause attacker's actions not being logged in the audit log.

Mitigation
Update to version 11.0.5, 12.0.3.

Vulnerable software versions

Nextcloud Server: 11.0.0 - 12.0.2

---

External links
http://nextcloud.com/security/advisory/?id=NC-SA-2018-006

---

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.