CVE-2024-23885
📋 TL;DR
CVE-2024-23885 is a stored Cross-Site Scripting (XSS) vulnerability in Cups Easy Purchase & Inventory version 1.0 that allows remote attackers to inject malicious scripts via the countryid parameter in countrymodify.php. When exploited, this can lead to session cookie theft and account compromise for authenticated users. Only organizations using the vulnerable Cups Easy 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 unauthorized access to purchase/inventory data, financial fraud, or lateral movement within the system.
Likely Case
Session hijacking allowing attackers to impersonate authenticated users and access their privileges within the application.
If Mitigated
Limited impact with proper input validation and output encoding preventing script execution.
🎯 Exploit Status
Exploitation requires authenticated user interaction via crafted URL.
🛠️ 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 countryid parameter in countrymodify.php.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to allow only expected characters in countryid parameter
Modify countrymodify.php to validate countryid parameter using regex: preg_match('/^[a-zA-Z0-9]+$/', $_GET['countryid'])
Output Encoding
allApply proper HTML encoding to all user-controlled output
Use htmlspecialchars() or equivalent when outputting countryid: echo htmlspecialchars($countryid, ENT_QUOTES, 'UTF-8');
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block XSS payloads in countryid parameter
- Restrict access to /cupseasylive/countrymodify.php to trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Test by injecting <script>alert('XSS')</script> into countryid parameter while authenticated and check if script executesCheck Version:
Check application version in admin panel or configuration filesVerify Fix Applied:
Verify that script tags in countryid parameter are properly encoded and do not execute📡 Detection & Monitoring
Log Indicators:
- Unusual countryid parameter values containing script tags or JavaScript in access logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- HTTP requests to countrymodify.php with suspicious parameters
- Outbound connections to unknown domains after visiting crafted URLs
SIEM Query:
source="web_access.log" AND uri="/cupseasylive/countrymodify.php" AND (param="countryid" AND value MATCHES "<script.*>.*</script>" OR "javascript:")