CVE-2017-7787 : Vulnerability Insights and Analysis
Learn about CVE-2017-7787 impacting Thunderbird, Firefox ESR, and Firefox versions, allowing iframes to bypass same-origin policy protections, leading to data disclosure. Find mitigation steps and updates here.
A security vulnerability impacting Thunderbird, Firefox ESR, and Firefox versions prior to specified releases.
Understanding CVE-2017-7787
What is CVE-2017-7787?
The vulnerability allows iframes to bypass same-origin policy protections during page reloads, leading to sensitive data disclosure.
The Impact of CVE-2017-7787
The security flaw affects Thunderbird versions prior to 52.3, Firefox ESR versions prior to 52.3, and Firefox versions prior to 55.
Technical Details of CVE-2017-7787
Vulnerability Description
The protection provided by the same-origin policy can be circumvented on pages with embedded iframes during reloads, enabling iframes to access main page content.
Affected Systems and Versions
- Thunderbird versions prior to 52.3
- Firefox ESR versions prior to 52.3
- Firefox versions prior to 55
Exploitation Mechanism
The vulnerability allows iframes to retrieve information from the main page, resulting in the disclosure of sensitive data.
Mitigation and Prevention
Immediate Steps to Take
- Update Thunderbird, Firefox ESR, and Firefox to versions 52.3 and above.
- Disable iframes on untrusted websites.
Long-Term Security Practices
- Regularly update browsers and email clients.
- Implement content security policies to restrict iframe behavior.
Patching and Updates
Apply security patches provided by Mozilla to address the vulnerability.