Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2025-70833 is an Authentication Bypass vulnerability in Smanga version 3.2.7 that allows an unauthenticated attacker to reset the password of any user, including the administrator, by manipulating POST parameters.'}, {'type': 'paragraph', 'content': "The root cause is insecure permission validation in the PHP script check-power.php, where the function check_user_power() retrieves the userId directly from POST data without verifying the user's session or authentication status."}, {'type': 'paragraph', 'content': 'This means the server trusts user-supplied input for permission checks, allowing an attacker to bypass authentication and perform actions as any user.'}, {'type': 'paragraph', 'content': "By sending a crafted POST request to update.php with specific parameters, an attacker can reset the administrator's password and take full control of the account without needing to log in."}] [1]

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Impact Analysis

This vulnerability can lead to complete account takeover of any user account, including the administrator.

An attacker gaining administrative access can access sensitive data, configurations, and media content stored within the application.

There is also a potential risk of remote code execution (RCE) due to the elevated privileges obtained through this exploit.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for unauthorized POST requests to the endpoint `/app/php/account/update.php` that include parameters such as `userId`, `targetUserId`, `userName`, and `passWord` without a valid authenticated session.'}, {'type': 'paragraph', 'content': 'A practical detection method is to inspect web server logs or use network monitoring tools to identify POST requests where `userId` and `targetUserId` are set, especially if `userId=1` (administrator) is present without a valid session cookie.'}, {'type': 'paragraph', 'content': 'Example command using grep on web server logs to find suspicious POST requests:'}, {'type': 'list_item', 'content': "grep -i 'POST /app/php/account/update.php' /var/log/apache2/access.log | grep 'userId=1'"}, {'type': 'paragraph', 'content': 'Additionally, you can use tools like curl to test if the endpoint accepts unauthenticated password reset requests by sending a crafted POST request similar to the proof of concept.'}, {'type': 'list_item', 'content': "curl -X POST https://your-smanga-site/app/php/account/update.php -d 'userId=1&targetUserId=1&userName=admin&passWord=hacked123&editUser=1&editMedia=1&mediaLimit=9999'"}] [1]

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Mitigation Strategies

Immediate mitigation steps include:

• Restrict access to the vulnerable PHP scripts (`check-power.php` and `update.php`) to authenticated users only by implementing proper session validation.
• Do not trust client-supplied POST parameters for authorization; instead, retrieve the user identity from server-side session data.
• Apply the suggested code fix by modifying the `check_user_power()` function to validate the session before processing any user ID parameters.
• Immediately change all administrator and critical user passwords to prevent unauthorized access.
• Monitor logs for suspicious activity and consider temporarily disabling the affected endpoints if possible until a secure patch is applied.

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