CVE-2019-11742 : Vulnerability Insights and Analysis
Learn about CVE-2019-11742, a vulnerability in Firefox, Thunderbird, and Firefox ESR allowing theft of cross-origin images. Find mitigation steps and affected versions here.
A same-origin policy violation allows the theft of cross-origin images through SVG filters and a <canvas> element in Firefox, Thunderbird, and Firefox ESR.
Understanding CVE-2019-11742
This CVE involves a security vulnerability that could lead to data theft by exploiting a same-origin policy violation.
What is CVE-2019-11742?
The vulnerability arises from an error in applying the same-origin policy to cached image content, enabling the theft of cross-origin images using SVG filters and a <canvas> element.
The Impact of CVE-2019-11742
Exploiting this vulnerability could result in the theft of sensitive data from affected systems running specific versions of Firefox, Thunderbird, and Firefox ESR.
Technical Details of CVE-2019-11742
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability allows for the theft of cross-origin images through a combination of SVG filters and a <canvas> element due to a same-origin policy violation.
Affected Systems and Versions
- Firefox versions less than 69
- Thunderbird versions less than 68.1 and 60.9
- Firefox ESR versions less than 60.9 and 68.1
Exploitation Mechanism
The exploitation involves leveraging the error in applying the same-origin policy to cached image content, utilizing SVG filters, and a <canvas> element to steal cross-origin images.
Mitigation and Prevention
Protecting systems from CVE-2019-11742 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update affected software to versions that address the vulnerability.
- Monitor for any signs of unauthorized access or data theft.
Long-Term Security Practices
- Regularly update software and apply security patches promptly.
- Implement network segmentation and access controls to limit exposure to potential threats.
Patching and Updates
Ensure that all systems running affected versions of Firefox, Thunderbird, and Firefox ESR are patched with the latest updates to mitigate the vulnerability.