CVE-2023-4055 : What You Need to Know

This CVE record was assigned by Mozilla and published on August 1, 2023. The vulnerability affects Firefox versions below 116, Firefox ESR versions below 102.14, and Firefox ESR versions below 115.1.

Understanding CVE-2023-4055

This CVE-2023-4055 vulnerability pertains to a situation where exceeding the number of cookies per domain in

document.cookie

caused inconsistencies in the cookie jar state. As a result, requests could be sent to a host with some cookies missing.

What is CVE-2023-4055?

The specific issue in CVE-2023-4055 revolves around a cookie jar overflow leading to unexpected cookie jar states. This can potentially disrupt the consistency of the cookie jar sent to the host, causing certain cookies to be missing in requests.

The Impact of CVE-2023-4055

Due to this vulnerability, requests may be sent with incomplete sets of cookies, which could have various implications on user privacy, session management, and website functionality. Attackers could potentially exploit this inconsistency for nefarious purposes.

Technical Details of CVE-2023-4055

The vulnerability described in CVE-2023-4055 affects multiple products and versions under Mozilla:

Vulnerability Description

Exceeding the cookie limit per domain in

document.cookie

can lead to inconsistencies in the cookie jar state, resulting in incomplete cookie sets sent with requests.

Affected Systems and Versions

Firefox < 116
Firefox ESR < 102.14
Firefox ESR < 115.1

Exploitation Mechanism

Attackers may exploit this vulnerability to manipulate the cookie state sent to hosts, potentially impacting user sessions and website functionality.

Mitigation and Prevention

To address CVE-2023-4055, certain immediate steps and long-term security practices are recommended:

Immediate Steps to Take

Update affected Firefox and Firefox ESR versions to versions that have patched this vulnerability.
Monitor and restrict the number of cookies per domain to prevent overflow.

Long-Term Security Practices

Regularly update browsers and apply security patches promptly.
Implement secure coding practices to prevent cookie-related vulnerabilities.

Patching and Updates

Stay informed about security advisories from Mozilla and promptly apply patches to mitigate the risks associated with CVE-2023-4055.