CVE-2020-6821 Explained : Impact and Mitigation
Learn about CVE-2020-6821 affecting Mozilla Thunderbird, Firefox ESR, and Firefox, allowing data disclosure through WebGL's copyTexSubImage method. Find mitigation steps and updates here.
A vulnerability in WebGL's copyTexSubImage method in Mozilla Thunderbird, Firefox ESR, and Firefox could lead to sensitive data disclosure.
Understanding CVE-2020-6821
What is CVE-2020-6821?
When utilizing WebGL's copyTexSubImage method, uninitialized memory could allow reading data from outside the intended resource, potentially exposing sensitive information.
The Impact of CVE-2020-6821
This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75, potentially leading to data disclosure.
Technical Details of CVE-2020-6821
Vulnerability Description
The vulnerability arises from uninitialized memory access when using the WebGL copyTexSubImage method, allowing potential data leakage.
Affected Systems and Versions
- Thunderbird < 68.7.0
- Firefox ESR < 68.7
- Firefox < 75
Exploitation Mechanism
By reading from areas beyond the source resource, attackers could access uninitialized memory, leading to data exposure.
Mitigation and Prevention
Immediate Steps to Take
- Update Thunderbird, Firefox ESR, and Firefox to versions 68.7.0, 68.7, and 75 respectively.
- Disable WebGL if not essential for browsing.
Long-Term Security Practices
- Regularly update browsers and applications to patch vulnerabilities.
- Implement proper data handling practices to minimize data exposure risks.
Patching and Updates
Apply the latest security patches provided by Mozilla to address the vulnerability.