CVE-2017-5963 : Security Advisory and Response

A security flaw in caddy (for TYPO3) version 7.2.10 and earlier allows attackers to inject unauthorized HTML and script code, potentially compromising websites.

Understanding CVE-2017-5963

What is CVE-2017-5963?

This CVE identifies a vulnerability in caddy (for TYPO3) versions 7.2.10 and earlier, arising from inadequate filtering of user-provided data in the "paymillToken" HTTP POST parameter.

The Impact of CVE-2017-5963

The vulnerability enables attackers to execute unauthorized HTML and script code within a browser, posing a risk of compromising the security of affected websites.

Technical Details of CVE-2017-5963

Vulnerability Description

The flaw in caddy (for TYPO3) version 7.2.10 and earlier allows attackers to inject and execute unauthorized HTML and script code by exploiting the "paymillToken" parameter.

Affected Systems and Versions

Product: caddy (for TYPO3)
Versions affected: 7.2.10 and earlier

Exploitation Mechanism

Attackers can exploit the vulnerability by injecting malicious code via the "paymillToken" HTTP POST parameter, leading to unauthorized code execution in the browser.

Mitigation and Prevention

Immediate Steps to Take

Update caddy (for TYPO3) to version 7.2.11 or later to mitigate the vulnerability.
Implement input validation mechanisms to sanitize user-provided data.

Long-Term Security Practices

Regularly monitor and audit web applications for security vulnerabilities.
Educate developers on secure coding practices to prevent similar issues.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.