CVE-2019-19916 Explained : Impact and Mitigation

Midori Browser 0.5.11 on Windows 10 is affected by a vulnerability related to the incorrect application of Content Security Policy (CSP) in multipart content, potentially leading to cross-site scripting (XSS) attacks.

Understanding CVE-2019-19916

This CVE describes a security issue in Midori Browser version 0.5.11 on Windows 10 where CSP is not correctly enforced on multipart content, allowing for potential XSS attacks.

What is CVE-2019-19916?

The vulnerability arises from the improper implementation of CSP in multipart content with the multipart/x-mixed-replace MIME type in Midori Browser 0.5.11 on Windows 10.
Attackers can exploit this flaw to execute scripts that should have been blocked by CSP, enabling XSS and other attacks when the content is displayed as HTML.
Remediation efforts should consider scenarios like polyglot files that can be valid images and scripts simultaneously.

The Impact of CVE-2019-19916

Allows malicious scripts to execute in situations where CSP should have prevented them, potentially leading to XSS and other security breaches.
Attackers can leverage this vulnerability to inject and execute arbitrary code on affected systems.

Technical Details of CVE-2019-19916

Midori Browser 0.5.11 on Windows 10 is susceptible to a CSP bypass vulnerability in multipart content delivery.

Vulnerability Description

CSP is not correctly applied to all components of multipart content with the multipart/x-mixed-replace MIME type, enabling script execution where it should be blocked.

Affected Systems and Versions

Midori Browser version 0.5.11 on Windows 10 is confirmed to be impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit the vulnerability by crafting malicious multipart content that bypasses CSP restrictions, allowing for script execution.

Mitigation and Prevention

Effective mitigation strategies are crucial to address and prevent the exploitation of CVE-2019-19916.

Immediate Steps to Take

Disable the affected browser or use alternative browsers with proper CSP implementation.
Implement strict content security policies and regularly monitor for any suspicious activities.

Long-Term Security Practices

Educate users on safe browsing habits and the risks associated with executing scripts from untrusted sources.
Regularly update browsers and security software to patch known vulnerabilities.

Patching and Updates

Stay informed about security updates for Midori Browser and apply patches promptly to mitigate the risk of exploitation.