CVE-2024-23869
📋 TL;DR
This is a stored Cross-Site Scripting (XSS) vulnerability in Cups Easy Purchase & Inventory software version 1.0. It allows remote attackers to inject malicious scripts via the 'issuanceno' parameter in stockissuanceprint.php, potentially stealing authenticated users' session cookies. Organizations using this specific version of Cups Easy 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 data theft, privilege escalation, and potential compromise of the entire Cups Easy system and connected systems.
Likely Case
Session hijacking allowing attackers to impersonate authenticated users, access sensitive inventory/purchase data, and perform unauthorized transactions.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers preventing script execution.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users into clicking malicious URLs. The XSS payload execution is straightforward once delivered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available references
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-cups-easy
Restart Required: No
Instructions:
1. Check vendor website for updated version. 2. If patch exists, download and replace affected files. 3. Test functionality after update. 4. No official patch guidance found in references.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side validation of 'issuanceno' parameter and proper output encoding in stockissuanceprint.php
Manual code modification required - no single command
Web Application Firewall (WAF) Rules
allDeploy WAF rules to block XSS payloads targeting the issuanceno parameter
WAF-specific configuration required
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to prevent script execution from untrusted sources
- Isolate the Cups Easy application in a segmented network zone with limited access
🔍 How to Verify
Check if Vulnerable:
Test by injecting basic XSS payloads into the 'issuanceno' parameter of /cupseasylive/stockissuanceprint.php and checking if scripts executeCheck Version:
Check application version in admin panel or review application files for version informationVerify Fix Applied:
After remediation attempts, test with same XSS payloads to confirm they no longer execute and are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual long or encoded parameter values in access logs for stockissuanceprint.php
- Multiple failed authentication attempts following XSS payload access
Network Indicators:
- HTTP requests containing script tags or JavaScript in issuanceno parameter
- Unexpected outbound connections from web server following XSS exploitation
SIEM Query:
web.url:*stockissuanceprint.php* AND (web.param.issuanceno:*script* OR web.param.issuanceno:*javascript* OR web.param.issuanceno:*onload* OR web.param.issuanceno:*alert*)