CVE-2024-23875
📋 TL;DR
CVE-2024-23875 is a stored cross-site scripting (XSS) vulnerability in Cups Easy version 1.0 that allows attackers to inject malicious scripts via the issuanceno parameter. This could enable session cookie theft when authenticated users visit crafted URLs. Only users running Cups Easy version 1.0 are affected.
💻 Affected Systems
- Cups Easy (Purchase & Inventory)
📦 What is this software?
Cups Easy by Ajaysharma
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover leading to unauthorized access to purchase and inventory data, potential financial fraud, and lateral movement within the system.
Likely Case
Session hijacking allowing attackers to impersonate authenticated users and access their privileges within the Cups Easy application.
If Mitigated
Limited impact with proper input validation and output encoding, potentially reduced to minor data exposure.
🎯 Exploit Status
Exploitation requires social engineering to deliver malicious URL to authenticated users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-cups-easy
Restart Required: No
Instructions:
No official patch available. Apply input validation and output encoding to stockissuancedisplay.php file.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement proper input validation and HTML encoding for the issuanceno parameter in stockissuancedisplay.php
Edit /cupseasylive/stockissuancedisplay.php to add htmlspecialchars() or similar encoding around issuanceno parameter usage
Web Application Firewall (WAF) Rules
allDeploy WAF rules to block XSS payloads in the issuanceno parameter
Configure WAF to block patterns like <script>, javascript:, and other XSS indicators in query parameters
🧯 If You Can't Patch
- Restrict access to the vulnerable endpoint using network segmentation or authentication requirements
- Implement Content Security Policy (CSP) headers to mitigate XSS impact
🔍 How to Verify
Check if Vulnerable:
Check if running Cups Easy version 1.0 and examine stockissuancedisplay.php for lack of input validation on issuanceno parameterCheck Version:
Check application version in admin panel or readme filesVerify Fix Applied:
Test the issuanceno parameter with XSS payloads like <script>alert('test')</script> and verify no script execution occurs📡 Detection & Monitoring
Log Indicators:
- Unusual long parameter values in access logs for stockissuancedisplay.php
- Multiple failed login attempts followed by successful access
Network Indicators:
- HTTP requests containing script tags or javascript: in issuanceno parameter
- Unusual outbound connections from web server
SIEM Query:
source="web_access_logs" AND uri="/cupseasylive/stockissuancedisplay.php" AND (param="issuanceno" AND value MATCHES "<script>|javascript:")