Executive Summary

This vulnerability is a reflected cross-site scripting (XSS) issue in MailEnable versions prior to 10.54. It occurs in the WindowContext parameter of the /Mondo/lang/sys/Forms/MAI/compose.aspx page. The parameter is not properly sanitized when processed via a GET request and is reflected inside a JavaScript <script> context. An attacker can craft a payload that breaks out of the existing script, injects malicious JavaScript, and causes it to execute in the victim's browser when they visit a malicious link or send an email. This allows the attacker to run arbitrary scripts in the context of the victim's session.

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Impact Analysis

Exploitation of this vulnerability can lead to several impacts: attackers can redirect victims to malicious websites, steal cookies that are not marked HttpOnly, inject arbitrary HTML or CSS into the page, and perform actions on behalf of the authenticated user. This can result in session hijacking, phishing, unauthorized actions, and other malicious activities within the affected application.

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Compliance Impact

The provided resources do not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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Detection Guidance

This vulnerability can be detected by testing the /Mondo/lang/sys/Forms/MAI/compose.aspx endpoint for reflected XSS in the WindowContext parameter via a crafted GET request. You can use tools like curl or a web vulnerability scanner to send a GET request with a payload in the WindowContext parameter and observe if the payload is reflected and executed in the JavaScript context. For example, using curl: curl -v "http://<target>/Mondo/lang/sys/Forms/MAI/compose.aspx?WindowContext=<script>alert(1)</script>" and then checking the response for the injected script. Additionally, using browser developer tools or automated scanners to detect reflected XSS in this parameter can help identify the vulnerability. [2]

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Mitigation Strategies

Immediate mitigation steps include upgrading MailEnable to version 10.54 or later, where this vulnerability has been fixed. If upgrading is not immediately possible, restrict access to the vulnerable endpoint, implement web application firewall (WAF) rules to block malicious payloads targeting the WindowContext parameter, and educate users to avoid clicking on suspicious links. Applying security best practices such as input validation and output encoding on the affected parameter can also help reduce risk until a patch is applied. [2, 3]

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