CVE-2017-7808 : Security Advisory and Response
Learn about CVE-2017-7808 affecting Mozilla Firefox versions before 55, leading to a cross-origin information leak due to a content security policy (CSP) vulnerability. Find mitigation steps and prevention measures.
Mozilla Firefox versions prior to 55 are vulnerable to a cross-origin information leak due to a content security policy (CSP) "frame-ancestors" directive that compares paths instead of origins when containing origins with paths.
Understanding CVE-2017-7808
This CVE involves a vulnerability in Mozilla Firefox versions before 55 that allows for a cross-origin information leak due to a specific CSP directive.
What is CVE-2017-7808?
A content security policy (CSP) "frame-ancestors" directive containing origins with paths allows for comparisons against those paths instead of the origin. This results in a cross-origin information leak of this path information.
The Impact of CVE-2017-7808
- Affected versions: Mozilla Firefox versions prior to 55
- Vulnerability: Cross-origin information leak due to CSP directive
Technical Details of CVE-2017-7808
Mozilla Firefox versions before 55 are susceptible to a specific vulnerability that can lead to a cross-origin information leak.
Vulnerability Description
The vulnerability arises from the incorrect comparison of paths instead of origins in the CSP "frame-ancestors" directive, leading to the leakage of sensitive information.
Affected Systems and Versions
- Product: Firefox
- Vendor: Mozilla
- Versions affected: < 55
Exploitation Mechanism
The vulnerability allows attackers to exploit paths within the CSP directive, potentially leaking sensitive information across origins.
Mitigation and Prevention
To address CVE-2017-7808, users and organizations should take immediate steps and implement long-term security practices.
Immediate Steps to Take
- Update Mozilla Firefox to version 55 or higher to mitigate the vulnerability.
- Monitor security advisories from Mozilla for any related updates.
Long-Term Security Practices
- Regularly update browsers and software to the latest versions.
- Implement robust CSP policies to prevent cross-origin information leaks.
Patching and Updates
- Apply patches and security updates provided by Mozilla to address the vulnerability effectively.