CVE-2020-11066 Explained : Impact and Mitigation

TYPO3 CMS versions 9.0.0 to 9.5.17 and 10.0.0 to 10.4.2 are vulnerable to improper object attribute modification through unserialize() calls.

Understanding CVE-2020-11066

TYPO3 CMS versions 9.0.0 to 9.5.17 and 10.0.0 to 10.4.2 are susceptible to a high-severity vulnerability that allows attackers to manipulate object attributes and potentially delete directories.

What is CVE-2020-11066?

In TYPO3 CMS versions 9.0.0 to 9.5.17 and 10.0.0 to 10.4.2, a flaw exists where calling unserialize() on malicious user input can lead to unauthorized modification of object attributes, potentially resulting in the deletion of directories and unauthorized email submissions.

The Impact of CVE-2020-11066

The vulnerability has a CVSS base score of 8.7, indicating a high severity issue with significant integrity and availability impacts. Attackers can exploit this flaw to delete directories and send emails using the web server's identity.

Technical Details of CVE-2020-11066

TYPO3 CMS vulnerability details and affected systems.

Vulnerability Description

The vulnerability allows attackers to modify object attributes through unserialize() calls, potentially leading to directory deletion and unauthorized email submissions.

Affected Systems and Versions

TYPO3 CMS versions >= 9.0.0, < 9.5.17
TYPO3 CMS versions >= 10.0.0, < 10.4.2

Exploitation Mechanism

Attackers can exploit this vulnerability by submitting malicious content that triggers unserialize() calls, leading to unauthorized object attribute modifications.

Mitigation and Prevention

Protecting systems from CVE-2020-11066.

Immediate Steps to Take

Update TYPO3 CMS to versions 9.5.17 and 10.4.2 to patch the vulnerability.
Avoid processing untrusted user input that may trigger unserialize() calls.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement input validation and sanitization to mitigate insecure deserialization risks.

Patching and Updates

Ensure timely application of security patches and updates to TYPO3 CMS to address CVE-2020-11066.