CVE-2020-16121 Explained : Impact and Mitigation

PackageKit error messages leak presence and mimetype of files to unprivileged users.

Understanding CVE-2020-16121

PackageKit vulnerability exposing sensitive file information to unauthorized users.

What is CVE-2020-16121?

PackageKit provided detailed error messages to unprivileged callers, revealing file presence and mimetype information that users couldn't access.

The Impact of CVE-2020-16121

CVSS Score: 3.3 (Low Severity)
Attack Vector: Local
Confidentiality Impact: Low
Integrity Impact: None
Privileges Required: Low
User Interaction: None
Scope: Unchanged
This vulnerability could allow unauthorized users to gather sensitive file information.

Technical Details of CVE-2020-16121

PackageKit vulnerability details and affected systems.

Vulnerability Description

PackageKit exposed file presence and mimetype information to unprivileged users through detailed error messages.

Affected Systems and Versions

Affected Versions:
PackageKit 1.1.13-2ubuntu1.1
PackageKit 1.1.9-1ubuntu2.18.04.6
PackageKit 0.8.17-4ubuntu6~gcc5.4ubuntu1.5

Exploitation Mechanism

The vulnerability allowed unprivileged users to access sensitive file information through error messages.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2020-16121.

Immediate Steps to Take

Update PackageKit to a non-vulnerable version.
Monitor system logs for any unauthorized access attempts.
Restrict access to sensitive files and directories.

Long-Term Security Practices

Regularly update software and security patches.
Implement least privilege access controls.
Conduct security training for users on handling sensitive information.

Patching and Updates

Apply the latest security patches provided by PackageKit.