CVE-2020-14976 Explained : Impact and Mitigation

GNS3 ubridge through 0.9.18 on macOS, as used in GNS3 server before 2.1.17, allows a local attacker to read arbitrary files due to a configuration-file error handling vulnerability.

Understanding CVE-2020-14976

This CVE identifies a security issue in GNS3 software that could be exploited by a local attacker to access arbitrary files.

What is CVE-2020-14976?

The vulnerability in GNS3 ubridge allows a local attacker to read arbitrary files by exploiting how the software handles configuration-file errors in a setuid root context.

The Impact of CVE-2020-14976

The vulnerability could lead to unauthorized access to sensitive information stored on the system, compromising data confidentiality and integrity.

Technical Details of CVE-2020-14976

GNS3 ubridge on macOS versions prior to 0.9.18 and GNS3 server versions before 2.1.17 are affected by this vulnerability.

Vulnerability Description

The issue arises from the software's improper handling of configuration-file errors, leading to the printing of the configuration file during execution in a privileged context.

Affected Systems and Versions

GNS3 ubridge through version 0.9.18 on macOS
GNS3 server versions earlier than 2.1.17

Exploitation Mechanism

By triggering configuration-file errors, a local attacker can exploit the vulnerability to gain access to arbitrary files on the system.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Update GNS3 software to version 2.1.17 or later to mitigate the vulnerability.
Regularly monitor system logs for any suspicious activities that could indicate exploitation attempts.

Long-Term Security Practices

Implement the principle of least privilege to restrict unnecessary access rights.
Conduct regular security audits and penetration testing to identify and address potential vulnerabilities.

Patching and Updates

Stay informed about security updates and patches released by GNS3 and apply them promptly to ensure the software is up-to-date and secure.