Boutique SudBox 1.2 CSRF Exploit: Password and Login Change

What this paper is

This paper describes a Cross-Site Request Forgery (CSRF) vulnerability in Boutique SudBox version 1.2. The vulnerability allows an attacker to trick a logged-in administrator into changing their own login credentials (username and password) without their knowledge or consent. The exploit provided is a simple HTML form that, when submitted by a victim, sends a POST request to the vulnerable password_2.php script.

Simple technical breakdown

CSRF attacks exploit the trust a web application has in a user's browser. When a user is logged into a website, their browser automatically sends authentication cookies with every request to that site.

In this case, Boutique SudBox 1.2 has a feature that allows administrators to change their login details. This feature likely relies on the user being authenticated (i.e., logged in) and doesn't adequately verify that the request to change credentials originated from a deliberate action by the logged-in user.

The exploit is a malicious HTML form. If an administrator visits a page containing this form (e.g., an attacker-controlled website or a compromised legitimate site) while logged into Boutique SudBox, and they interact with the form (even accidentally), their browser will send the crafted request to the Boutique SudBox server. The server, seeing a valid administrator session, will process the request and change the login details.

Complete code and payload walkthrough

The provided exploit is a simple HTML form. There is no complex code or shellcode in this specific exploit file.

<?
?>
<Center>
<form action="http://localhost/boutique/admin/password_2.php" method="post" target='_top'>
<center>
<br><font class='grand'><b>Changer votre Login et Mot de Passe</b></font><br>
	<table border="0">
	<tr>
		<td>Login: </td>
		<td><input type="text" name="admin"></td>
	</tr><tr>
		<td>Mot de passe: </td>
		<td><input type="password" name="motdepasse"></td>
	</tr><tr>
		<td colspan="2"><input type="submit" value="Envoyer"></td>
	</table>
</form>
<?
?>

Code Fragment/Block -> Practical Purpose

• <? ?>: These are PHP opening and closing tags. While present, they are empty in this context, suggesting the author might have intended to embed dynamic PHP but ultimately provided a static HTML form. They don't perform any action here.
• <Center>: This HTML tag is used to center its content on the page. It's purely for presentation.
• <form action="http://localhost/boutique/admin/password_2.php" method="post" target='_top'>: This is the core of the exploit.
  • action="http://localhost/boutique/admin/password_2.php": This specifies the target URL where the form data will be sent. The attacker assumes the victim is logged into Boutique SudBox, and this URL points to the script responsible for changing administrator credentials. localhost implies the attacker is targeting a system where Boutique SudBox is running locally on the victim's machine or within their local network, or they are assuming the victim's browser will resolve localhost to the target server if the exploit is hosted elsewhere but the target is internal.
  • method="post": This indicates that the form data will be sent using the HTTP POST method, which is typical for submitting sensitive information or performing state-changing actions.
  • target='_top': This attribute tells the browser to load the response in the full body of the window, replacing any frames. This is often used in CSRF to ensure the action is performed in the main context of the vulnerable application.
• <center>: Another centering tag.
• <br>: Line break tag for spacing.
• <font class='grand'><b>Changer votre Login et Mot de Passe</b></font><br>: This displays a bolded title in French, "Change your Login and Password," for the user. The class='grand' is a CSS class, likely defined in the target application's stylesheet, used for styling.
• <table border="0">: Starts an HTML table with no visible border.
• <tr>: Table row.
• <td>Login: </td>: Table data cell displaying the label "Login:".
• <td><input type="text" name="admin"></td>: Table data cell containing an input field.
  • type="text": This is a standard text input field.
  • name="admin": This is the crucial part. When the form is submitted, the value entered into this field will be sent as a parameter named admin in the POST request. The vulnerable password_2.php script likely expects the new username here.
• <tr><td>Mot de passe: </td><td><input type="password" name="motdepasse"></td></tr>: Similar to the login field, but for the password.
  • type="password": This renders a password input field, masking the entered characters.
  • name="motdepasse": The value entered here will be sent as a parameter named motdepasse. The vulnerable script expects the new password here.
• <tr><td colspan="2"><input type="submit" value="Envoyer"></td></tr>: The submit button.
  • colspan="2": Makes the cell span two columns for better table layout.
  • type="submit": This is the button that, when clicked, triggers the form submission.
  • value="Envoyer": The text displayed on the button, meaning "Send" in French.

Payload Explanation:

The "payload" in this exploit is not shellcode but the data that the HTML form is designed to send. When the victim clicks the "Envoyer" button, their browser will construct and send an HTTP POST request to http://localhost/boutique/admin/password_2.php. The request body will look something like this (assuming the victim entered "newuser" for login and "newpass" for password):

admin=newuser&motdepasse=newpass

The password_2.php script on the Boutique SudBox server is expected to receive these parameters and update the administrator's login credentials accordingly.

Practical details for offensive operations teams

• Required Access Level: No elevated access is required on the target system itself. The exploit targets the user's browser and relies on the user being already authenticated to the target web application.
• Lab Preconditions:
  • A running instance of Boutique SudBox 1.2.
  • An administrator account with known credentials (or at least the ability to log in as an administrator).
  • The ability to host the exploit HTML file on a web server accessible to the target administrator. This could be an attacker-controlled server or a compromised legitimate website.
  • The target administrator must be logged into Boutique SudBox 1.2 in their browser session.
• Tooling Assumptions:
  • A web server to host the exploit HTML file (e.g., Apache, Nginx, Python's http.server).
  • A text editor to create the exploit HTML file.
  • A browser for testing.
• Execution Pitfalls:
  • localhost Resolution: The exploit uses http://localhost/. This will only work if the target administrator is running Boutique SudBox on their own machine and the exploit is also served from that same machine, or if the attacker can somehow force the victim's browser to resolve localhost to the target server (highly unlikely without other vulnerabilities). More realistically, the attacker would replace localhost with the actual IP address or domain name of the Boutique SudBox instance.
  • Same-Origin Policy: If the exploit is hosted on a different domain than the target application, the browser's Same-Origin Policy might prevent the form submission or subsequent actions if JavaScript is involved in the target application's CSRF protection. However, for simple HTML forms submitting via POST, this is less of a concern if the user is logged in.
  • CSRF Tokens: Modern web applications implement CSRF tokens. These are unique, secret, unpredictable values generated by the server and included in forms. The server then checks if the submitted token matches the one issued for the user's session. If Boutique SudBox 1.2 lacks this protection (as is common in older software), this exploit would be effective.
  • User Interaction: The victim must visit the page containing the exploit form and either click the "Envoyer" button or have the form auto-submit (which would require adding JavaScript to the exploit, not present in the provided code).
  • Target Version: The exploit is specific to Boutique SudBox 1.2.
• Tradecraft Considerations:
  • Social Engineering: The attacker would need to trick the victim into visiting the malicious page. This could involve phishing emails, malicious ads, or other social engineering tactics.
  • Hosting: The exploit needs to be hosted where the target can access it. If the target is internal, the attacker might need to compromise an internal server or use a public-facing server if the target application is also public-facing.
  • Payload Delivery: The exploit is delivered via a URL. The attacker needs a way to get the victim to click that URL.
  • Post-Exploitation: Once the credentials are changed, the attacker can log in as the administrator. The next steps would depend on the attacker's objectives (e.g., data exfiltration, further system compromise).

Where this was used and when

• Context: This vulnerability was discovered and published in 2010. It targets a specific web application, "Boutique SudBox," which appears to be an e-commerce or business management solution written in PHP.
• Usage: CSRF vulnerabilities like this were common in web applications before robust defenses like CSRF tokens became standard. Attackers would leverage them to gain unauthorized administrative access or perform malicious actions on behalf of authenticated users. The exploit itself is a simple HTML form, suggesting it was likely used in targeted attacks or as a proof-of-concept for demonstrating the vulnerability. The specific year of publication (2010) indicates its relevance around that time.

Defensive lessons for modern teams

• Implement CSRF Protection: Always use unique, unpredictable CSRF tokens for any request that modifies state (e.g., changing passwords, making purchases, deleting data). These tokens should be generated server-side, embedded in forms, and verified upon submission.
• Validate Origin: While not a primary defense against CSRF, checking the Referer header can provide an additional layer, though it's not foolproof.
• Same-Site Cookies: Modern browsers support SameSite cookie attributes, which can mitigate CSRF by controlling when cookies are sent with cross-site requests.
• Web Application Firewalls (WAFs): WAFs can be configured to detect and block common CSRF patterns.
• Secure Development Practices: Educate developers on common web vulnerabilities like CSRF and ensure they follow secure coding guidelines.
• Regular Patching and Updates: Keep all web applications and their dependencies updated to patch known vulnerabilities. Boutique SudBox 1.2 is clearly outdated.
• Principle of Least Privilege: Ensure that administrative accounts are only used when necessary.

ASCII visual (if applicable)

This exploit is a client-side attack that relies on the victim's browser and an existing authenticated session. An ASCII diagram can illustrate the flow:

+-----------------+       +--------------------+       +-----------------------+
| Attacker's Host | ----> | Victim's Browser   | ----> | Boutique SudBox Server|
| (Hosts Exploit) |       | (Logged-in Admin)  |       | (Vulnerable App)      |
+-----------------+       +--------------------+       +-----------------------+
        ^                       |
        |                       | 1. Victim visits attacker's page
        |                       |    with malicious form.
        |                       |
        |                       | 2. Victim clicks "Envoyer"
        |                       |    (or form auto-submits).
        |                       |    Browser sends POST request
        |                       |    with new credentials.
        |                       |
        |                       | 3. Server receives request,
        |                       |    trusts the session,
        |                       |    and updates credentials.
        |                       |
        +-----------------------+
              (Exploit HTML Form)

Source references

• Paper ID: 12419
• Paper Title: Boutique SudBox 1.2 - Cross-Site Request Forgery (Changer Login et Mot de Passe)
• Author: indoushka
• Published: 2010-04-27
• Keywords: PHP, webapps
• Paper URL: https://www.exploit-db.com/papers/12419

Original Exploit-DB Content (Verbatim)

========================================================================================                  
| # Title    : Boutique SudBox 1.2 Changer Login et Mot de Passe CSRF Vulnerability           
| # Author   : indoushka                                                               
| # email    : indoushka@hotmail.com                                                  
| # Home     : www.iqs3cur1ty.com/vb                                                                                                                                                                                                                   
| # Tested on: windows SP2 Français V.(Pnx2 2.0)       
| # Bug      : CSRF                                                                     
======================      Exploit By indoushka       =================================
 # Exploit  : 
 
 1 - Changer votre Login et Mot de Passe CSRF :
 
<?
?>
<Center>
<form action="http://localhost/boutique/admin/password_2.php" method="post" target='_top'>
<center>
<br><font class='grand'><b>Changer votre Login et Mot de Passe</b></font><br>
	<table border="0">
	<tr>
		<td>Login: </td>
		<td><input type="text" name="admin"></td>
	</tr><tr>
		<td>Mot de passe: </td>
		<td><input type="password" name="motdepasse"></td>
	</tr><tr>
		<td colspan="2"><input type="submit" value="Envoyer"></td>
	</table>
</form>
<?
?>
 
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