SB2021102620 - Multiple vulnerabilities in Nextcloud Server

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Main Vulnerability Database SB2021102620

SB2021102620 - Multiple vulnerabilities in Nextcloud Server

Published: October 26, 2021

Security Bulletin ID SB2021102620
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Path traversal (CVE-ID: CVE-2021-41178)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote authenticated attacker can send a specially crafted HTTP request and download arbitrary SVG images.


2) Improper control of interaction frequency (CVE-ID: CVE-2021-41177)

CWE-ID: CWE-799 - Improper Control of Interaction Frequency

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


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

The vulnerability exists due to improper control of interaction frequency. A remote authenticated attacker can gain access to the target application.


3) Improper Authentication (CVE-ID: CVE-2021-41179)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the Two-Factor Authentication is not enforced for pages marked as public. A remote authenticated attacker can bypass authentication process and gain unauthorized access to sensitive information.


Remediation

Install update from vendor's website.

References