CVE-2021-43847 : Vulnerability Insights and Analysis

HumHub is an open-source social network kit written in PHP. An authorization bypass vulnerability existed in versions prior to 1.10.3 and 1.9.3, allowing registered users to become unauthorized members of private Spaces. Versions 1.10.3 and 1.9.3 have addressed this issue.

Understanding CVE-2021-43847

CVE-2021-43847 pertains to an Authorization Bypass in Space Invite in HumHub.

What is CVE-2021-43847?

CVE-2021-43847 is an improper authorization vulnerability in HumHub versions < 1.9.3 and >= 1.10.0, < 1.10.3 that could enable registered users to gain unauthorized access to private Spaces.

The Impact of CVE-2021-43847

The vulnerability could lead to unauthorized users joining private Spaces, compromising the confidentiality of those Spaces' content.

Technical Details of CVE-2021-43847

The following are the technical details of CVE-2021-43847:

Vulnerability Description

Type: Improper Authorization (CWE-285)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality Impact: High
Integrity Impact: None
Availability Impact: None
CVSS v3.1 Base Score: 6.5 (Medium)

Affected Systems and Versions

Product: HumHub
Vendor: HumHub
Vulnerable Versions: < 1.9.3, >= 1.10.0, < 1.10.3

Exploitation Mechanism

The vulnerability could be exploited by registered users to gain unauthorized access to private Spaces.

Mitigation and Prevention

Immediate Steps to Take:

Update HumHub to version 1.10.3 or 1.9.3
Review and adjust Space permissions regularly

Long-Term Security Practices:

Implement a strong authentication mechanism
Conduct regular security audits
Educate users on secure practices

Patching and Updates:

Apply patches provided in version 1.10.3 or 1.9.3 to address the authorization bypass issue.