CVE-2017-7835 : What You Need to Know

Firefox versions prior to 57 have a vulnerability in the way they implement mixed content blocking, allowing certain blocked resources to still load on the page, posing a security risk.

Understanding CVE-2017-7835

This CVE relates to a specific vulnerability in Firefox versions before 57 that affects the implementation of mixed content blocking.

What is CVE-2017-7835?

The vulnerability in CVE-2017-7835 involves the incorrect application of mixed content blocking in Firefox versions prior to 57. When a secure document contains a sub-resource that redirects from HTTPS to insecure HTTP, the blocking mechanism fails to prevent certain types of content, like scripts, from loading.

The Impact of CVE-2017-7835

The vulnerability allows blocked resources to be loaded on the page, creating a security risk by potentially exposing users to malicious scripts or content.

Technical Details of CVE-2017-7835

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from the incorrect application of mixed content blocking when resources redirect from HTTPS to HTTP, leading to the loading of blocked content on the page.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 57

Exploitation Mechanism

The vulnerability can be exploited by including sub-resources that redirect from HTTPS to HTTP within a secure document, bypassing the intended blocking mechanism.

Mitigation and Prevention

To address CVE-2017-7835, certain steps can be taken to mitigate the risk and prevent exploitation.

Immediate Steps to Take

Update Firefox to version 57 or higher to mitigate the vulnerability.
Avoid visiting untrusted websites or clicking on suspicious links to reduce the risk of exposure.

Long-Term Security Practices

Regularly update browsers and software to ensure the latest security patches are applied.
Enable secure browsing settings to enhance protection against mixed content vulnerabilities.

Patching and Updates

Stay informed about security advisories from Mozilla and apply recommended patches promptly to protect against known vulnerabilities.