A new vulnerability alert has been raised as multiple stored cross-site scripting (XSS) vulnerabilities have been discovered in Usermin 2.000. In this blog post, we will go in-depth into the issue, including exploring code snippets, linking to original references, and providing details on the possible exploits. It is paramount that developers, system administrators, and end-users take necessary precautions to mitigate potential risks arising from these vulnerabilities.

What is Usermin?

Usermin is a web-based interface designed for webmail and primarily targeted for use by regular users who require a simplified and more accessible interface to manage their accounts. Usermin provides users with limited access to manage aspects like email, passwords, and other user account configurations.

Vulnerability Details

The vulnerability CVE-2023-41157, refers to multiple stored XSS vulnerabilities in Usermin 2.000, where remote attackers can inject arbitrary web script or HTML via the folder name parameter while creating the folder to manage the folder tab, filter tab, and forward mail tab. These XSS vulnerabilities can potentially enable attackers to execute malicious code on a victim's browser, leading to unauthorized access, stealing sensitive data, or performing other malicious actions.

Let us take a look at the code snippet that demonstrates this vulnerability.

Code Snippet

<!-- BEGIN: Vulnerable Code Block -->
<form action="/usermin/mailbox/create_folder.cgi" method="post">
    <label for="folder_name">Folder Name:</label>
    <input type="text" name="folder_name" id="folder_name">
    <input type="submit" value="Create Folder">
</form>
<!-- END: Vulnerable Code Block -->

In the above code snippet, the folder name input field is vulnerable to XSS attacks because Usermin 2.000 does not adequately sanitize and validate the input. Hence, it allows for arbitrary script or HTML code injection by an attacker.

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The attacker uses the folder creation form to submit the malicious folder name.

3. The injected JavaScript code will be executed when a victim accesses the folder tab, filter tab, or forward mail tab.

Original References

1. Official Usermin Repository: https://github.com/webmin/usermin
2. Usermin Download Page: https://www.webmin.com/usermin.html

To protect your systems from the effects of CVE-2023-41157, consider applying the following mitigation strategies:

1. Implement proper input sanitization and validation on all user-submitted data, especially the folder creation form.
2. Employ Content Security Policy (CSP) to restrict the execution of third-party scripts and to implement best security practices against XSS attacks.

Keep Usermin and other software applications up to date with the latest patches.

In conclusion, the CVE-2023-41157 vulnerability represents a severe issue that affects the security and privacy of Usermin users. By following the recommended mitigation strategies and staying informed of the latest updates, you can minimize the risks associated with these vulnerabilities. Don't forget to share this information with your colleagues or other Usermin users to ensure they are also aware and can take necessary actions to protect their systems.

Timeline

Published on: 09/16/2023 06:15:07 UTC
Last modified on: 09/20/2023 13:23:42 UTC