CVE-2021-36793 : Security Advisory and Response

A security vulnerability has been identified in the routes (aka Extbase Yaml Routes) extension before version 2.1.1 for TYPO3. This vulnerability, assigned the identifier CVE-2021-36793, allows for Sensitive Information Disclosure when the CsrfTokenViewHelper is used due to the unsafe presence of a session identifier in HTML output.

Understanding CVE-2021-36793

This section provides an insight into the nature and impact of CVE-2021-36793.

What is CVE-2021-36793?

The CVE-2021-36793 vulnerability arises in the routes extension for TYPO3 prior to version 2.1.1, particularly when the CsrfTokenViewHelper is utilized. This vulnerability enables Sensitive Information Disclosure as a result of an insecure session identifier being exposed in HTML responses.

The Impact of CVE-2021-36793

The presence of an unsecured session identifier in HTML output can lead to attackers gaining unauthorized access to sensitive information, compromising the confidentiality of user data and potentially allowing for further exploitation.

Technical Details of CVE-2021-36793

Delve deeper into the specifics of the CVE-2021-36793 vulnerability to better understand its implications.

Vulnerability Description

The routes extension in TYPO3, versions prior to 2.1.1, is susceptible to Sensitive Information Disclosure due to the improperly handled session identifier within HTML output, triggered when using CsrfTokenViewHelper.

Affected Systems and Versions

All versions of the routes (aka Extbase Yaml Routes) extension before 2.1.1 for TYPO3 are impacted by CVE-2021-36793, necessitating immediate action to address this security flaw.

Exploitation Mechanism

Exploitation of this vulnerability involves malicious actors extracting the session identifier from the HTML output, opening the door for unauthorized access and potential data breaches.

Mitigation and Prevention

Discover the necessary steps to mitigate the risks posed by CVE-2021-36793 and secure your systems effectively.

Immediate Steps to Take

It is crucial to update the routes extension to version 2.1.1 or later to eliminate the vulnerability and safeguard against Sensitive Information Disclosure. Additionally, monitor for any suspicious activity that may indicate exploitation of this security flaw.

Long-Term Security Practices

Implement robust security measures, including regular security assessments and updates, to fortify the resilience of your TYPO3 environment and prevent similar vulnerabilities from being exploited in the future.

Patching and Updates

Stay informed about security advisories and patches released by TYPO3 to address vulnerabilities promptly. Regularly apply updates to ensure that your systems are protected against known security risks.