CVE-2018-5114 : Exploit Details and Defense Strategies

CVE-2018-5114 is a vulnerability affecting Mozilla Firefox versions prior to 58, allowing access to the initial value of an "HttpOnly" cookie via scripts until the document is closed.

Understanding CVE-2018-5114

This CVE entry highlights a security flaw in Firefox versions older than 58 that could compromise the confidentiality of sensitive information.

What is CVE-2018-5114?

When a cookie is modified to have the attribute "HttpOnly" while a document is being viewed, its initial value can still be accessed via script until the document is closed. However, network requests will use the updated HttpOnly cookie as intended. This security flaw impacts Firefox versions earlier than 58.

The Impact of CVE-2018-5114

The vulnerability allows scripts to access the original value of an "HttpOnly" cookie, potentially exposing sensitive data until the document is closed. This could lead to unauthorized access to confidential information.

Technical Details of CVE-2018-5114

This section provides more in-depth technical insights into the CVE-2018-5114 vulnerability.

Vulnerability Description

If an existing cookie is changed to be "HttpOnly" while a document is open, the original value remains accessible through script until that document is closed. Network requests correctly use the changed HttpOnly cookie. This vulnerability affects Firefox versions prior to 58.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 58

Exploitation Mechanism

The vulnerability allows scripts to access the original value of an "HttpOnly" cookie until the document is closed, potentially compromising sensitive data.

Mitigation and Prevention

To address CVE-2018-5114 and enhance security measures, consider the following steps:

Immediate Steps to Take

Update Firefox to version 58 or newer to mitigate the vulnerability.
Avoid accessing sensitive information on untrusted websites.
Regularly clear cookies and browsing data to minimize exposure.

Long-Term Security Practices

Implement strict cookie security policies to prevent unauthorized access.
Educate users on safe browsing practices and the risks associated with cookie vulnerabilities.

Patching and Updates

Stay informed about security advisories from Mozilla and promptly apply recommended patches to secure your browsing experience.