Multiple cross-site scripting (XSS) vulnerabilities in Open Constructor 3.12.0 allow remote attackers to inject arbitrary web script or HTML via (1) the result parameter to data/file/edit.php, (2) the q parameter to confirm.php, or (3) the keyword parameter to users/users.php.
Open Constructor 3.12.0 suffers from multiple cross-site scripting (XSS) vulnerabilities, allowing attackers to inject malicious scripts into web pages viewed by users. Successful exploitation can lead to account compromise, data theft, and website defacement. This vulnerability requires immediate attention due to its potential for widespread impact.
Step 1: Payload Delivery: The attacker crafts a malicious URL containing a specially crafted payload within the vulnerable parameters ('result', 'q', or 'keyword').
Step 2: Request Submission: The attacker sends the malicious URL to a victim, typically through phishing, social engineering, or a compromised website.
Step 3: Server Processing: The vulnerable Open Constructor script receives the malicious request and processes the parameters.
Step 4: Vulnerable Output: The script directly incorporates the attacker's payload into the HTML response without proper sanitization or encoding.
Step 5: Browser Execution: The victim's browser receives the malicious HTML, including the attacker's script, and executes it in the context of the vulnerable website.
Step 6: Exploitation: The attacker's script executes, enabling actions like cookie theft, session hijacking, redirection to malicious sites, or defacement.
The root cause of these XSS vulnerabilities lies in the failure to properly sanitize user-supplied input before rendering it in the HTML output. Specifically, the vulnerable PHP scripts (data/file/edit.php, confirm.php, and users/users.php) directly incorporate parameters like 'result', 'q', and 'keyword' into the HTML without any form of encoding or filtering. This allows attackers to inject arbitrary HTML and JavaScript code into the web pages, which is then executed in the victim's browser. The lack of input validation and output encoding is a classic example of a security flaw, enabling attackers to manipulate the rendered content and execute malicious scripts within the context of the vulnerable website. The absence of proper security measures, such as HTML escaping or input validation, allows the attacker to inject malicious code.