Overview
CVE-2025-63725 details a reflected Cross-Site Scripting (XSS) vulnerability found in SVX Portal version 2.7A. The vulnerability exists within the Recivers.php file, specifically through the unsanitized handling of the id parameter. An attacker can inject malicious JavaScript code into the application’s response, which will then be executed by the victim’s browser. This can lead to various malicious activities such as session hijacking, defacement, or redirection to phishing sites.
Technical Details
The vulnerability lies in the way the id parameter is used within the Recivers.php script. The input provided through this parameter is not properly sanitized or encoded before being reflected back in the HTML output. This allows an attacker to inject arbitrary JavaScript code into the HTML context. Specifically, the vulnerability appears to be located within an attribute context, which can be more complex to exploit due to filtering or encoding requirements.
An example of a malicious request could look like this:
GET /Recivers.php?id="><script>alert('XSS')</script>
This payload attempts to break out of the existing HTML attribute using ">, then injects a <script> tag containing JavaScript code. The alert('XSS') function is a simple demonstration of the vulnerability, but more sophisticated payloads could be used.
CVSS Analysis
Currently, the CVSS score and severity are listed as N/A. However, based on the nature of reflected XSS vulnerabilities, it is likely to be classified as Medium to High severity. A proper CVSS score should be calculated based on the exploitability metrics (attack vector, attack complexity, privileges required, user interaction) and impact metrics (confidentiality, integrity, availability).
Possible Impact
The exploitation of this reflected XSS vulnerability can have significant consequences:
- Session Hijacking: An attacker can steal a user’s session cookie and gain unauthorized access to their account.
- Website Defacement: The attacker can modify the appearance of the website, potentially displaying misleading or malicious content.
- Redirection to Phishing Sites: Users can be redirected to fake login pages designed to steal their credentials.
- Malware Distribution: The attacker can inject code that downloads and installs malware on the victim’s computer.
- Information Disclosure: An attacker might be able to access sensitive information that the user has access to within the application.
Mitigation and Patch Steps
To mitigate this vulnerability, the following steps should be taken:
- Input Validation and Sanitization: Implement strict input validation to ensure that the
idparameter only accepts expected values. Sanitize any user-supplied input before it is used in the application’s response. - Output Encoding: Encode all user-supplied data before it is displayed in the HTML output. Use context-appropriate encoding functions to prevent the injection of malicious code. For attribute context, HTML attribute encoding is critical.
- Web Application Firewall (WAF): Deploy a WAF to detect and block XSS attacks. Configure the WAF to specifically protect against reflected XSS vulnerabilities in the
Recivers.phpfile. - Upgrade SVX Portal: If a patch or updated version of SVX Portal 2.7A is available, upgrade to the latest version as soon as possible. This is the most effective way to address the vulnerability.
- Disable or Remove Unused Functionality: If the
Recivers.phpfunctionality or theidparameter is not essential, consider disabling or removing it completely to eliminate the attack vector.
