CVE-2019-17000 : What You Need to Know

This CVE-2019-17000 article provides insights into a security vulnerability in Firefox versions older than 70 that could potentially bypass Content Security Policy (CSP) using object tags with data URIs.

Understanding CVE-2019-17000

This section delves into the details of the vulnerability and its impact.

What is CVE-2019-17000?

The object tag in Firefox, when combined with a data URI, failed to properly acquire the Content Security Policy of the embedding document. This flaw could lead to a CSP bypass in a cross-origin frame, but only if the document's policy explicitly allowed data: URIs.

The Impact of CVE-2019-17000

The vulnerability affects Firefox versions older than 70, potentially enabling attackers to bypass CSP in specific scenarios.

Technical Details of CVE-2019-17000

Explore the technical aspects of the vulnerability.

Vulnerability Description

An object tag with a data URI in Firefox did not correctly inherit the document's CSP, allowing for a CSP bypass in cross-origin frames under certain conditions.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Vulnerable Versions: Before 70

Exploitation Mechanism

The vulnerability could be exploited by embedding an object tag with a data URI in a document with a permissive CSP policy for data: URIs.

Mitigation and Prevention

Learn how to address and prevent the CVE-2019-17000 vulnerability.

Immediate Steps to Take

Update Firefox to version 70 or newer to mitigate the vulnerability.
Review and adjust CSP policies to restrict the use of data: URIs if not essential.

Long-Term Security Practices

Regularly update browsers and apply security patches promptly.
Implement strict CSP policies to minimize the risk of bypass vulnerabilities.

Patching and Updates

Stay informed about security advisories and apply patches as soon as they are available.