Vulnerability identifier: #VU48605

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8279

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Social app
Client/Desktop applications / Other client software

Vendor: Nextcloud

Description

The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists due to missing validation of server certificates for out-going connections. A remote attacker can perform a MitM attack on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Social app: 0.3.1

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External links
http://hackerone.com/reports/915585
http://nextcloud.com/security/advisory/?id=NC-SA-2020-043

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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.