Recently, it has been brought to our attention that a XSS vulnerability exists in Dinstar FXO Analog VoIP Gateway DAG200-16O. This vulnerability allows attackers to execute malicious scripts in the user's browser, which could lead to the theft of sensitive information, unauthorized access, and other security breaches. In this post, we are going to take a deep dive into the vulnerability, its potential impact, and possible mitigation strategies.

Vulnerability Details

The affected version of the Dinstar DAG200-16O Analog VoIP Gateway software fails to adequately sanitize user-supplied input in a number of its parameters, which can lead to a Cross-Site Scripting (XSS) vulnerability. To reference the official CVE, check it out here: CVE-2022-44284


The following code snippet demonstrates the malicious payload that could be injected to exploit the XSS vulnerability:

<script>alert("XSS Vulnerability Exploited!");</script>

Upon injecting this payload into one of the vulnerable parameters, the user's browser will execute the JavaScript code, leading to an alert box showing "XSS Vulnerability Exploited!" message. This is just a simple example; a real-world attack could include more sophisticated code designed to steal sensitive information or gain unauthorized access.

1. CVE-2022-44284 Official CVE Entry
2. Dinstar DAG200-16O Product Information

Mitigation Strategies

Considering the potential impact of this vulnerability, it is essential for organizations using Dinstar FXO Analog VoIP Gateway DAG200-16O to implement security measures to address the issue. Some recommended steps include:

1. Update the software: Check with Dinstar for any available software updates that may include patches designed to fix the XSS vulnerability. Regularly check for new updates to ensure your gateway's security is up-to-date.

2. Input validation: Implementing strong input validation on all parameters is crucial to prevent malicious payloads from being injected into your gateway's web interface. Additionally, ensure that your validation mechanisms can handle a wide range of characters, including special characters and whitespace.

3. Output encoding: When displaying user-supplied data in the gateway's web interface, use proper output encoding techniques to help prevent the execution of malicious payloads. Safe encoding techniques include HTML Entity encoding, URL encoding, and JavaScript encoding, among others.

4. Content Security Policy (CSP): Apply a CSP to your gateway's web interface to restrict the sources of content that are executed in the user's browser. This can help to mitigate the risks of XSS attacks by preventing the loading of unauthorized scripts from malicious sources.


CVE-2022-44284 exposes a critical XSS vulnerability in Dinstar DAG200-16O Analog VoIP Gateway, which could potentially put your organization at risk. It is essential to carefully assess your infrastructure and take necessary steps to mitigate the risks associated with this vulnerability. By understanding the exploit and implementing the recommended mitigation strategies, you can protect your organization's assets and minimize the chances of a successful attack.


Published on: 11/28/2022 15:15:00 UTC
Last modified on: 12/01/2022 22:40:00 UTC