PT-2020-20047 · Nextcloud+1 · Nextcloud Server+1

Dominik Schürmann + 1 · Published 2020-10-15 · Updated 2022-09-27 · CVE-2020-8236

Positive Technologies (AI Summary)

CVSS v3.1

6.8

Medium

Base vector

AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Nextcloud Server version 19.0.1

Description The issue arises from a misconfiguration in Nextcloud Server, where the user is incorrectly led to believe that passwordless WebAuthn also serves as two-factor verification. This misconception occurs because the system prompts for the passwordless WebAuthn PIN but fails to verify it.

Recommendations For Nextcloud Server version 19.0.1, ensure that the WebAuthn configuration is corrected to properly verify the PIN when prompting for it, thereby accurately implementing two-factor verification.

Exploit

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

ALT-PU-2020-3060

CVE-2020-8236

Affected Products

Alt Linux

Nextcloud Server

References · 4

• 🔥 https://hackerone.com/reports/924393 · Exploit
• https://osv.dev/vulnerability/CVE-2020-8236 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-8236 · Security Note
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-037 · Vendor Advisory