Remote code execution in Nextcloud Desktop Client

1) Input validation error

EUVDB-ID: #VU52063

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-22879

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input passed via URL. A malicious server can pass specially crafted URL to the client application and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

desktop: 3.0.0 - 3.1.2

External links

http://nextcloud.com/security/advisory/?id=NC-SA-2021-008

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.