Multiple vulnerabilities in Nextcloud Desktop client

Published: 2020-08-27

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-8189 CVE-2020-8227
CWE-ID	CWE-79 CWE-22
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	desktop Other software / Other software solutions
Vendor	Nextcloud

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting

EUVDB-ID: #VU46083

Risk: Low

CVSSv3.1: 3.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8189

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to read and manipulate data.

A cross-site scripting error in Nextcloud Desktop client 2.6.4 allowed to present any html (including local links) when responding with invalid data on the login attempt.

Mitigation

Install update from vendor's website.

Vulnerable software versions

desktop: 2.0.0 - 2.6.4

External links

http://hackerone.com/reports/685552
http://nextcloud.com/security/advisory/?id=NC-SA-2020-027

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) Path traversal

EUVDB-ID: #VU46082

Risk: Medium