Stored XSS in GotoHTTP up to 10.2

Executive Summary

This vulnerability is a reflected Cross-Site Scripting (XSS) issue found in the /reg.12x endpoint of the GotoHTTP platform. It occurs because the sn parameter in HTTP GET requests is not properly sanitized and is directly echoed back to the client without HTML encoding.

An attacker can craft a malicious URL containing JavaScript code in the sn parameter. When a victim clicks this URL, the injected script executes in their browser, potentially allowing the attacker to hijack sessions, steal credentials, perform actions on behalf of the victim, or disclose information.

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Impact Analysis

Exploitation of this vulnerability can lead to several security impacts including session hijacking, credential theft, unauthorized actions performed in the victim's context, and information disclosure.

• Session hijacking
• Credential theft
• Arbitrary actions performed on behalf of the victim
• Information disclosure

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Compliance Impact

The vulnerability is a reflected Cross-Site Scripting (XSS) issue that can lead to session hijacking, credential theft, arbitrary actions on behalf of the victim, or information disclosure. Such impacts can potentially result in unauthorized access to personal or sensitive data.

Because of these risks, this vulnerability could affect compliance with standards and regulations like GDPR and HIPAA, which require protection of personal data and secure handling of user information to prevent unauthorized access or disclosure.

However, the vendor states that the vulnerable URL is never used in browsers nor exposed to users, which they argue mitigates the practical security risk. Despite this, the existence of an exploitable XSS vulnerability may still pose compliance concerns depending on the environment and data handled.

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Detection Guidance

This vulnerability can be detected by sending crafted HTTP GET requests to the /reg.12x endpoint of the GotoHTTP platform with a malicious sn parameter containing JavaScript code. If the response reflects the sn parameter without proper HTML encoding, it indicates the presence of the reflected Cross-Site Scripting (XSS) vulnerability.

• Use curl or similar tools to send a request like: curl -i "http://<target>/reg.12x?sn=<script>alert('xss')</script>"
• Check the HTTP response for the presence of the injected script in the error message or response body.
• Monitor network traffic for suspicious URLs containing the sn parameter with script tags or JavaScript code.

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Mitigation Strategies

Immediate mitigation involves preventing the exploitation of the reflected XSS vulnerability by avoiding the use of the vulnerable /reg.12x endpoint or sanitizing the sn parameter input.

• Remove or disable the /reg.12x endpoint if it is not necessary.
• Implement input validation and proper HTML encoding on the sn parameter to prevent script injection.
• Educate users to avoid clicking suspicious links containing the sn parameter.
• Apply any vendor patches or updates when they become available, as the vendor plans to include fixes in the next version.

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