innologi appointments Extension Appointment cross site scripting

Successful exploitation of CVE-2019-25094 allows an attacker to inject arbitrary JavaScript code into the TYPO3 Appointments Extension. This code can then be executed in the context of a user's browser, potentially leading to session hijacking, credential theft, or defacement of the website. The attacker could also redirect users to malicious websites or install malware. Given the widespread use of TYPO3 and its extensions, this vulnerability could have a significant impact if exploited on a large scale. The ability to manipulate formfield arguments remotely makes this vulnerability particularly concerning.

Organizations using TYPO3 with the appointments Extension installed in versions 2.0.0 through 2.0.5 are at risk. This includes websites that rely on the appointments Extension for scheduling and event management. Shared hosting environments utilizing TYPO3 are particularly vulnerable, as they may lack the resources or expertise to promptly apply security updates.

• php: Examine appointment handler code for unsanitized formfield inputs. Search for instances where $POST or $GET data is directly outputted to the page without proper encoding.

// Example of vulnerable code
<?php
echo $_GET['formfield']; // Vulnerable to XSS
?>

• web: Monitor access logs for unusual requests containing JavaScript payloads in formfield parameters. Look for patterns indicative of XSS attempts.

grep -i 'script|alert' /var/log/apache2/access.log

• generic web: Check response headers for the presence of unexpected JavaScript code. Use browser developer tools to inspect the rendered HTML and identify any injected scripts.

1. 2019-08-29Discovery

   discovery

2. 2023-01-04Disclosure

   disclosure

1. आरक्षित2023-01-04
2. प्रकाशित2023-01-04
3. संशोधित2024-08-05
4. EPSS अद्यतन2026-04-02

The primary mitigation for CVE-2019-25094 is to upgrade the appointments Extension to version 2.0.6 or later. This version includes a patch (identifier: 986d3cb34e5e086c6f04e061f600ffc5837abe7f) that addresses the vulnerability. If immediate upgrading is not possible, consider implementing input validation and sanitization on the Appointment Handler to prevent the injection of malicious scripts. While a Web Application Firewall (WAF) might offer some protection, it's not a substitute for patching. After upgrading, verify the fix by attempting to submit a form with a crafted payload containing a JavaScript snippet; the payload should be properly sanitized and not executed.