CVE-2021-43788 : Security Advisory and Response

Nodebb, an open-source forum software, was vulnerable to path traversal allowing unauthorized access to JSON files. The issue affects versions >= 1.0.4 and < 1.18.5. This CVE has a CVSS score of 5 (Medium severity).

Understanding CVE-2021-43788

Prior to version 1.18.5, a path traversal vulnerability in NodeBB allowed users to access JSON files outside the expected directory.

What is CVE-2021-43788?

NodeBB is a Node.js based forum software
Vulnerability: Path traversal
Versions affected: >= 1.0.4, < 1.18.5
Advisory: GHSA-pfj7-2qfw-vwgm

The Impact of CVE-2021-43788

CVSS Score: 5 (Medium)
Attack Complexity: Low
Attack Vector: Network
Privileges Required: Low
Scope: Changed
Confidentiality Impact: Low
Integrity Impact: None
Availability Impact: None
User Interaction: None

Technical Details of CVE-2021-43788

NodeBB's vulnerability in the translator module had the following details:

Vulnerability Description

Path traversal vulnerability
Allowed access to JSON files outside 'languages/' directory

Affected Systems and Versions

Product: NodeBB
Vendor: NodeBB
Versions: >= 1.0.4, < 1.18.5

Exploitation Mechanism

The vulnerable versions allowed unauthorized users to navigate outside the specified directory, potentially leading to unauthorized access to sensitive JSON files.

Mitigation and Prevention

After understanding the vulnerability, it is crucial to take immediate steps and implement long-term security practices.

Immediate Steps to Take

Upgrade NodeBB to version 1.18.5 or later
Monitor and restrict access to sensitive directories

Long-Term Security Practices

Regular security audits and code reviews
Implement least privilege access

Patching and Updates

Apply security patches promptly
Stay informed about security vulnerabilities and updates