CVE-2019-9817 : Vulnerability Insights and Analysis
Learn about CVE-2019-9817 affecting Thunderbird, Firefox, and Firefox ESR versions, allowing unauthorized extraction of image data from other websites. Find mitigation steps here.
A vulnerability in Thunderbird, Firefox, and Firefox ESR versions could allow unauthorized extraction of image data from other websites.
Understanding CVE-2019-9817
What is CVE-2019-9817?
Under certain conditions, a canvas object can be exploited to retrieve images from a different domain, potentially violating the same-origin policy.
The Impact of CVE-2019-9817
This vulnerability affects Thunderbird versions prior to 60.7, Firefox versions before 67, and Firefox ESR versions before 60.7.
Technical Details of CVE-2019-9817
Vulnerability Description
Exploiting a canvas object can lead to the unauthorized extraction of image data from another website.
Affected Systems and Versions
- Thunderbird versions less than 60.7
- Firefox versions less than 67
- Firefox ESR versions less than 60.7
Exploitation Mechanism
The vulnerability allows the retrieval of images from a distinct domain using a canvas object.
Mitigation and Prevention
Immediate Steps to Take
- Update Thunderbird, Firefox, and Firefox ESR to versions 60.7 and 67 or higher, respectively.
- Avoid visiting untrusted websites.
Long-Term Security Practices
- Regularly update software to the latest versions.
- Implement content security policies to restrict cross-origin data access.
Patching and Updates
Apply patches provided by Mozilla to address the vulnerability.