CVE-2022-36104 : Exploit Details and Defense Strategies

TYPO3, an open-source PHP-based web content management system, is affected by a vulnerability that enables Denial of Service via Page Error Handling. By triggering the page error handler with invalid resources, an attacker can cause the application to call itself recursively, potentially overwhelming the web server. Updating to TYPO3 version 11.5.16 is recommended to mitigate this issue.

Understanding CVE-2022-36104

This section provides insights into the impact and technical details of the CVE-2022-36104 vulnerability.

What is CVE-2022-36104?

CVE-2022-36104 affects TYPO3 versions, allowing attackers to exploit the page error handler to trigger recursive calls, potentially leading to DoS attacks. The vulnerability has a CVSS base score of 5.9 (Medium severity).

The Impact of CVE-2022-36104

The vulnerability poses a high availability impact, with potential attackers being able to exploit it over the network without any user interaction. While it does not affect confidentiality or integrity, the issue can result in a denial of service if not addressed promptly.

Technical Details of CVE-2022-36104

This section outlines the specifics of the vulnerability, including affected systems, versions, and the exploitation mechanism.

Vulnerability Description

In TYPO3 versions prior to 11.5.16, requesting invalid or non-existing resources via HTTP can trigger the page error handler, leading to recursive calls that amplify the impact of the attack until server limits are reached.

Affected Systems and Versions

The vulnerability impacts TYPO3 versions >= 11.4.0 and < 11.5.16. Users operating on these versions are at risk of DoS attacks through the exploitation of the page error handling mechanism.

Exploitation Mechanism

Attackers can exploit this vulnerability by requesting non-existing resources via HTTP, causing the page error handler to fetch error content from another page. This recursive behavior can be leveraged to intensify the impact of the attack.

Mitigation and Prevention

To safeguard systems against CVE-2022-36104, immediate action should be taken to address the vulnerability and prevent potential exploitation.

Immediate Steps to Take

Users are strongly advised to update their TYPO3 installations to version 11.5.16 to mitigate the risk of DoS attacks via page error handling. Applying the latest security patches is crucial to protect against known vulnerabilities.

Long-Term Security Practices

In addition to immediate updates, maintaining regular security audits and monitoring for new vulnerabilities is recommended. Employing security best practices and staying informed about TYPO3 security advisories can help enhance overall system security.

Patching and Updates

Stay informed about security updates released by TYPO3 and promptly apply patches to address any identified vulnerabilities. Regularly updating the CMS and monitoring security advisories are essential steps in mitigating risks associated with software vulnerabilities.