CVE-2019-16699 : Exploit Details and Defense Strategies

The TYPO3 extension sr_freecap (also known as freeCap CAPTCHA) versions 2.4.5 and earlier, as well as versions 2.5.2 and earlier, have a vulnerability that allows attackers to execute arbitrary Extbase actions, potentially leading to remote code execution.

Understanding CVE-2019-16699

This CVE identifies a security issue in the TYPO3 extension sr_freecap that could be exploited by attackers to execute malicious code remotely.

What is CVE-2019-16699?

The vulnerability in the sr_freecap extension allows attackers to bypass input filtering, enabling them to perform unauthorized Extbase actions, which can result in the execution of malicious code from a remote location.

The Impact of CVE-2019-16699

Exploitation of this vulnerability can lead to severe consequences, including unauthorized execution of malicious code on the affected system, potentially compromising data and system integrity.

Technical Details of CVE-2019-16699

This section provides more technical insights into the vulnerability.

Vulnerability Description

The TYPO3 extension sr_freecap versions 2.4.5 and below, as well as versions 2.5.2 and below, lack proper input filtering, allowing attackers to execute arbitrary Extbase actions, leading to remote code execution.

Affected Systems and Versions

TYPO3 extension sr_freecap versions 2.4.5 and earlier
TYPO3 extension sr_freecap versions 2.5.2 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious code through user input fields, bypassing the input filtering mechanisms and executing unauthorized Extbase actions.

Mitigation and Prevention

Protecting systems from CVE-2019-16699 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the TYPO3 extension sr_freecap to the latest patched version.
Implement strict input validation and filtering mechanisms to prevent code injection attacks.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

Regularly update all software components to their latest secure versions.
Conduct security audits and penetration testing to identify and address vulnerabilities proactively.
Educate users and administrators about secure coding practices and the importance of input validation.
Consider implementing a web application firewall to add an extra layer of protection.

Patching and Updates

Ensure timely installation of security patches released by TYPO3 for the sr_freecap extension to mitigate the vulnerability effectively.