CVE-2020-11069 : Exploit Details and Defense Strategies

In TYPO3 CMS 9.0.0 through 9.5.16 and 10.0.0 through 10.4.1, a vulnerability exists in the backend user interface and install tool, allowing for same-site request forgery attacks. This can lead to the execution of malicious scripts with the victim's user session privileges, potentially enabling the creation of new admin users by attackers. The issue is a combination of cross-site request forgery (CSRF) and cross-site scripting (XSS) vulnerabilities.

Understanding CVE-2020-11069

This CVE pertains to a security vulnerability in TYPO3 CMS versions 9.0.0 to 9.5.16 and 10.0.0 to 10.4.1, allowing for same-site request forgery attacks.

What is CVE-2020-11069?

The vulnerability in TYPO3 CMS enables attackers to trick backend users into interacting with malicious resources, leading to script execution with the victim's session privileges. This can result in the creation of unauthorized admin users.

The Impact of CVE-2020-11069

The vulnerability has a CVSS v3.1 base score of 8 (High severity) with low attack complexity and privileges required. It poses a high risk to confidentiality, integrity, and availability, requiring user interaction for exploitation.

Technical Details of CVE-2020-11069

The technical aspects of the vulnerability in TYPO3 CMS.

Vulnerability Description

The issue allows for same-site request forgery attacks, exploiting backend user sessions to execute malicious scripts and potentially create unauthorized admin users.

Affected Systems and Versions

Affected versions: TYPO3 CMS >= 9.0.0, < 9.5.17 and >= 10.0.0, < 10.4.2

Exploitation Mechanism

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Unchanged
Confidentiality, Integrity, and Availability Impact: High

Mitigation and Prevention

Measures to mitigate and prevent the CVE-2020-11069 vulnerability.

Immediate Steps to Take

Update TYPO3 CMS to versions 9.5.17 and 10.4.2 to patch the vulnerability.

Long-Term Security Practices

Implement the Sudo Mode Extension to intercept security-relevant database modifications.
Utilize Content Security Policies to control resource handling and disallow script executions in critical locations.
Regularly review and update security configurations to prevent similar vulnerabilities.
Educate users on safe browsing practices and potential security risks.

Patching and Updates

Ensure timely installation of security patches and updates for TYPO3 CMS to address known vulnerabilities.