CVE-2024-23861
📋 TL;DR
CVE-2024-23861 is a stored Cross-Site Scripting (XSS) vulnerability in Cups Easy version 1.0 that allows remote attackers to inject malicious scripts via the unitofmeasurementid parameter. Exploitation requires tricking an authenticated user into visiting a specially crafted URL, potentially leading to session cookie theft and account compromise. This affects all users running the vulnerable version of Cups Easy Purchase & Inventory software.
💻 Affected Systems
- Cups Easy (Purchase & Inventory)
📦 What is this software?
Cups Easy by Ajaysharma
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover through session cookie theft, leading to unauthorized access, data manipulation, and potential privilege escalation within the application.
Likely Case
Session hijacking allowing attackers to impersonate authenticated users, access sensitive purchase/inventory data, and perform unauthorized actions within the application.
If Mitigated
Limited impact with proper input validation and output encoding, potentially reduced to minor UI disruption without data compromise.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users, but the XSS payload execution is straightforward once the malicious URL is accessed.
🛠️ 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:
1. Review the INCIBE advisory for updates. 2. Monitor vendor for patch release. 3. Apply workarounds immediately while waiting for official fix.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement proper input validation and output encoding in the unitofmeasurementcreate.php file to sanitize the unitofmeasurementid parameter.
Edit /cupseasylive/unitofmeasurementcreate.php to add htmlspecialchars() or similar encoding around the vulnerable parameter
Web Application Firewall (WAF) Rules
allDeploy WAF rules to block XSS payloads targeting the vulnerable endpoint.
Configure WAF to block requests containing script tags or JavaScript in the unitofmeasurementid parameter
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to prevent script execution from untrusted sources.
- Restrict access to the vulnerable endpoint using network segmentation or authentication requirements.
🔍 How to Verify
Check if Vulnerable:
Test the /cupseasylive/unitofmeasurementcreate.php endpoint with XSS payloads in the unitofmeasurementid parameter to see if scripts execute.Check Version:
Check application version in admin panel or configuration files; confirm if running version 1.0.Verify Fix Applied:
Verify that input validation and output encoding prevent script execution when testing with XSS payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual requests to /cupseasylive/unitofmeasurementcreate.php with script tags or JavaScript in parameters
- Multiple failed login attempts followed by successful access from new sessions
Network Indicators:
- HTTP requests containing malicious scripts in the unitofmeasurementid parameter
- Unexpected outbound connections from the application server
SIEM Query:
source="web_logs" AND url="/cupseasylive/unitofmeasurementcreate.php" AND (param="unitofmeasurementid" AND value CONTAINS "script" OR "javascript")