CVE-2019-17003 : Security Advisory and Response

This CVE record involves a vulnerability in Mozilla Firefox for iOS that could allow the execution of embedded JavaScript code when scanning a QR code with a javascript: URL.

Understanding CVE-2019-17003

If a QR code containing a javascript: URL was scanned, it would lead to the execution of the embedded JavaScript code.

What is CVE-2019-17003?

CVE-2019-17003 is a vulnerability in Mozilla Firefox for iOS that arises when scanning a QR code with a javascript: URL, resulting in the execution of the embedded JavaScript code.

The Impact of CVE-2019-17003

This vulnerability could potentially lead to cross-site scripting (XSS) attacks, allowing malicious actors to execute arbitrary code within the context of the affected browser.

Technical Details of CVE-2019-17003

Vulnerability Description

The vulnerability stems from improper parsing of QR codes in the address bar, enabling the execution of JavaScript code embedded within the QR code.

Affected Systems and Versions

Vendor: Mozilla
Product: Firefox for iOS
Affected Versions:
Version: Unspecified, Less than or Equal to 25
Version: Next of 25 (Unaffected)

Exploitation Mechanism

The exploitation occurs when a user scans a QR code containing a javascript: URL, triggering the execution of the embedded JavaScript code.

Mitigation and Prevention

Immediate Steps to Take

Avoid scanning QR codes from untrusted or unknown sources.
Disable automatic QR code scanning in browsers.
Regularly update the browser to the latest version.

Long-Term Security Practices

Educate users on safe browsing practices and the risks associated with scanning QR codes.
Implement content security policies (CSP) to mitigate XSS vulnerabilities.

Patching and Updates

Ensure that Mozilla Firefox for iOS is regularly updated to the latest version to patch known vulnerabilities and enhance security.