CVE-2021-41867 : Vulnerability Insights and Analysis

OnionShare 2.3 before 2.4 has an information disclosure vulnerability that allows remote unauthenticated attackers to obtain the full participant list of a non-public OnionShare node.

Understanding CVE-2021-41867

This CVE report details a specific vulnerability present in OnionShare versions 2.3 before 2.4.

What is CVE-2021-41867?

An information disclosure vulnerability in OnionShare 2.3 before 2.4 enables remote unauthenticated attackers to access the complete list of participants in a non-public OnionShare node through the --chat feature.

The Impact of CVE-2021-41867

This vulnerability could lead to unauthorized disclosure of sensitive information shared within OnionShare nodes, potentially compromising user privacy and confidentiality.

Technical Details of CVE-2021-41867

This section outlines the technical aspects of the CVE issue.

Vulnerability Description

The vulnerability in OnionShare versions 2.3 before 2.4 allows unauthorized retrieval of the full participant list via the --chat function.

Affected Systems and Versions

Affected Systems: OnionShare 2.3 before 2.4
Affected Versions: All versions prior to 2.4

Exploitation Mechanism

Attackers can exploit this vulnerability remotely without authentication, gaining access to sensitive participant information in non-public OnionShare nodes.

Mitigation and Prevention

Protect your systems from the CVE vulnerability using the following strategies.

Immediate Steps to Take

Upgrade OnionShare to version 2.4 or later to mitigate the vulnerability.
Avoid sharing sensitive information on non-public OnionShare nodes until the system is updated.

Long-Term Security Practices

Regularly update software to the latest versions to patch known vulnerabilities.
Conduct security audits to identify and address potential information disclosure issues.

Patching and Updates

Stay informed about security updates and promptly apply patches to keep OnionShare and other software secure.