CVE-2018-19960 : What You Need to Know

OnionShare up to version 1.3.1 is affected by a vulnerability that allows local users to overwrite files or access confidential information when the --debug feature is enabled.

Understanding CVE-2018-19960

This CVE describes a security issue in OnionShare that could lead to unauthorized access and file manipulation.

What is CVE-2018-19960?

The debug_mode function in web/web.py within OnionShare up to version 1.3.1 uses a specific file path for logging when the --debug feature is enabled, potentially granting local users the ability to overwrite files or gain access to sensitive data.

The Impact of CVE-2018-19960

The vulnerability could be exploited by local users to compromise the confidentiality and integrity of data stored on the system running the affected OnionShare version.

Technical Details of CVE-2018-19960

This section provides more technical insights into the vulnerability.

Vulnerability Description

The debug_mode function in web/web.py in OnionShare through 1.3.1, when --debug is enabled, uses the /tmp/onionshare_server.log pathname for logging, which might allow local users to overwrite files or obtain sensitive information.

Affected Systems and Versions

Product: OnionShare
Vendor: N/A
Versions affected: Up to 1.3.1

Exploitation Mechanism

The vulnerability arises due to the improper use of file paths for logging purposes, enabling local users to manipulate files and access confidential information.

Mitigation and Prevention

Protecting systems from this vulnerability requires specific actions.

Immediate Steps to Take

Disable the --debug feature in OnionShare to prevent the exploitation of this vulnerability.
Regularly monitor system logs for any suspicious activities.

Long-Term Security Practices

Implement the principle of least privilege to restrict access to critical system files.
Conduct regular security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Update OnionShare to the latest version that includes a fix for this vulnerability to ensure system security.