CVE-2024-23889
📋 TL;DR
CVE-2024-23889 is a stored cross-site scripting (XSS) vulnerability in Cups Easy version 1.0 that allows remote attackers to inject malicious scripts via the itemgroupid parameter. When exploited, this can lead to session cookie theft and account compromise for authenticated users. Only organizations using Cups Easy Purchase & Inventory software 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 lateral movement within the application.
Likely Case
Session hijacking allowing attackers to impersonate authenticated users and access their permissions within the application.
If Mitigated
Limited impact with proper input validation and output encoding preventing script execution.
🎯 Exploit Status
Exploitation requires user interaction (clicking malicious link) but uses standard XSS techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
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 /cupseasylive/itemgroupcreate.php.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to sanitize itemgroupid parameter
Edit /cupseasylive/itemgroupcreate.php to add: $itemgroupid = htmlspecialchars($_GET['itemgroupid'], ENT_QUOTES, 'UTF-8');
Web Application Firewall Rule
allBlock malicious XSS payloads in itemgroupid parameter
WAF rule: Block requests containing <script> or javascript: in itemgroupid parameter
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Restrict access to /cupseasylive/itemgroupcreate.php to trusted users only
🔍 How to Verify
Check if Vulnerable:
Test by injecting <script>alert('XSS')</script> into itemgroupid parameter and checking if script executesCheck Version:
Check application version in admin panel or configuration filesVerify Fix Applied:
Verify that injected scripts are properly encoded and do not execute in browser📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /cupseasylive/itemgroupcreate.php with script tags in parameters
- Unusual session activity from same IP
Network Indicators:
- Malicious URLs containing script payloads being accessed
SIEM Query:
source="web_logs" AND uri="/cupseasylive/itemgroupcreate.php" AND (itemgroupid CONTAINS "<script>" OR itemgroupid CONTAINS "javascript:")