CVE-2019-19849 : Exploit Details and Defense Strategies

A vulnerability has been identified in TYPO3 versions before 8.7.30, 9.x before 9.5.12, and 10.x before 10.2.2, affecting the classes QueryGenerator and QueryView with potential scenarios for exploitation.

Understanding CVE-2019-19849

This CVE pertains to insecure deserialization in TYPO3 versions before specified releases.

What is CVE-2019-19849?

In TYPO3 versions before 8.7.30, 9.x before 9.5.12, and 10.x before 10.2.2, the vulnerability lies in the classes QueryGenerator and QueryView, making them susceptible to insecure deserialization.

The Impact of CVE-2019-19849

The vulnerability has a CVSS base score of 8.8 (High severity) with high impacts on confidentiality, integrity, and availability. It requires low privileges for exploitation.

Technical Details of CVE-2019-19849

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The classes QueryGenerator and QueryView in TYPO3 are vulnerable to insecure deserialization, allowing potential exploitation scenarios.

Affected Systems and Versions

TYPO3 versions before 8.7.30
TYPO3 9.x before 9.5.12
TYPO3 10.x before 10.2.2

Exploitation Mechanism

Two potential scenarios for exploitation:

Requires ext:lowlevel (Backend Module: DB Check) with an admin backend user.
Requires ext:sys_action with a backend user having restricted privileges.

Mitigation and Prevention

Protecting systems from CVE-2019-19849 is crucial.

Immediate Steps to Take

Update TYPO3 to versions 8.7.30, 9.5.12, or 10.2.2.
Disable unnecessary system extensions.
Monitor backend user privileges.

Long-Term Security Practices

Regularly update TYPO3 and extensions.
Conduct security audits and penetration testing.

Patching and Updates

Apply security patches promptly.