CVE-2022-23500 : What You Need to Know

A detailed analysis of the CVE-2022-23500 vulnerability affecting TYPO3, leading to uncontrolled recursion and denial of service.

Understanding CVE-2022-23500

This section provides insights into the nature, impact, and technical details of the CVE-2022-23500 vulnerability in TYPO3.

What is CVE-2022-23500?

CVE-2022-23500 pertains to uncontrolled recursion in TYPO3 versions earlier than 9.5.38, 10.4.33, 11.5.20, and 12.1.1. Exploiting this vulnerability may trigger the page error handler recursively, potentially causing denial of service.

The Impact of CVE-2022-23500

The impact of this CVE lies in the ability to manipulate the page error handler, leading to recursive calls that overload the web server and result in denial of service. This vulnerability amplifies the initial attack's impact, affecting the system's availability.

Technical Details of CVE-2022-23500

Explore the technical aspects of CVE-2022-23500, including vulnerability description, affected systems, and exploitation mechanisms.

Vulnerability Description

The vulnerability in TYPO3 arises from handling invalid resource requests via HTTP, triggering recursive page error handling. This recursive process fetches content for error messages, potentially overwhelming the web server.

Affected Systems and Versions

TYPO3 versions prior to 9.5.38, 10.4.33, 11.5.20, and 12.1.1 are susceptible to CVE-2022-23500. Systems running these versions are at risk of uncontrolled recursion leading to denial of service.

Exploitation Mechanism

Exploiting CVE-2022-23500 involves sending malformed HTTP requests to the TYPO3 application, initiating recursive page error handling. This process continues until the server exceeds its operational limits, resulting in a denial of service.

Mitigation and Prevention

Learn how to mitigate the risks posed by CVE-2022-23500 through immediate steps and long-term security measures.

Immediate Steps to Take

Users should update TYPO3 to versions 9.5.38, 10.4.33, 11.5.20, or 12.1.1 to patch the vulnerability and prevent recursive page error handling. Additionally, monitor web server resources to detect unusual recursive patterns.

Long-Term Security Practices

Implement web application firewalls, intrusion detection systems, and regular security audits to proactively identify and address vulnerabilities that could lead to denial of service attacks.

Patching and Updates

Regularly apply security patches and updates provided by TYPO3 to address known vulnerabilities and enhance the system's resilience against uncontrolled recursion and similar threats.