CVE-2019-9797 : Vulnerability Insights and Analysis

Cross-origin images can be read in violation of the same-origin policy in Firefox versions older than 66.

Understanding CVE-2019-9797

This CVE involves a vulnerability in Firefox that allows unauthorized reading of cross-origin images, impacting versions prior to 66.

What is CVE-2019-9797?

The issue arises when exporting an image after using createImageBitmap to read it and displaying the resulting bitmap within a canvas element.
This action enables the unauthorized reading of cross-origin images, violating the same-origin policy.
The vulnerability affects Firefox versions older than 66.

The Impact of CVE-2019-9797

Allows unauthorized access to cross-origin images, compromising user privacy and security.
Exploitation can lead to potential data theft and unauthorized access to sensitive information.

Technical Details of CVE-2019-9797

This section provides more in-depth technical information about the CVE.

Vulnerability Description

Exporting an image after using createImageBitmap to read it and displaying the resulting bitmap within a canvas element enables the unauthorized reading of cross-origin images.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 66

Exploitation Mechanism

By manipulating the createImageBitmap function, attackers can bypass the same-origin policy and access cross-origin images.

Mitigation and Prevention

Protect your systems and data from CVE-2019-9797 with these mitigation strategies.

Immediate Steps to Take

Update Firefox to version 66 or newer to mitigate the vulnerability.
Avoid exporting images after using createImageBitmap in potentially untrusted environments.
Regularly monitor security advisories for updates and patches.

Long-Term Security Practices

Implement strict content security policies to restrict resource access.
Educate users on safe browsing practices and the risks associated with cross-origin image vulnerabilities.

Patching and Updates

Stay informed about security updates and patches released by Mozilla for Firefox.
Promptly apply patches to ensure your systems are protected from known vulnerabilities.