Multiple vulnerabilities in Nextcloud Social app

Published: 2020-11-23

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-8278 CVE-2020-8279
CWE-ID	CWE-284 CWE-295
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Nextcloud Social app Client/Desktop applications / Other client software
Vendor	Nextcloud

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper access control

EUVDB-ID: #VU48604

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8278

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote attacker can bypass implemented security restrictions and read posts of any user.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Social app: 0.3.1

External links

http://hackerone.com/reports/921717
http://nextcloud.com/security/advisory/?id=NC-SA-2020-042

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.

2) Improper Certificate Validation

EUVDB-ID: #VU48605

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 - Improper Certificate Validation