CVE-2017-5408 : Security Advisory and Response
Learn about CVE-2017-5408, a Mozilla vulnerability allowing unauthorized cross-origin loading of video captions, potentially leading to sensitive information disclosure. Find mitigation steps and updates here.
A vulnerability in Mozilla products allowed the loading of video captions cross-origin, potentially leading to sensitive information disclosure.
Understanding CVE-2017-5408
What is CVE-2017-5408?
The vulnerability involved missing CORS headers in video files, enabling unauthorized cross-origin loading of video captions, potentially exposing sensitive information.
The Impact of CVE-2017-5408
The vulnerability affected versions of Firefox, Firefox ESR, and Thunderbird, allowing unauthorized access to video captions and potential disclosure of sensitive information.
Technical Details of CVE-2017-5408
Vulnerability Description
Video files could load captions cross-origin without proper CORS header checks, potentially leading to the disclosure of sensitive information within the captions.
Affected Systems and Versions
- Firefox < 52
- Firefox ESR < 45.8
- Thunderbird < 52
- Thunderbird < 45.8
Exploitation Mechanism
The vulnerability exploited the absence of CORS headers in video files, allowing unauthorized cross-origin loading of video captions.
Mitigation and Prevention
Immediate Steps to Take
- Update affected Mozilla products to versions above the specified vulnerable versions.
- Disable cross-origin loading of video captions in browser settings.
Long-Term Security Practices
- Regularly update browsers and email clients to the latest versions.
- Implement strict CORS policies to prevent unauthorized cross-origin access.
Patching and Updates
- Apply security patches provided by Mozilla to address the vulnerability and prevent potential information disclosure.