CVE-2024-23887
📋 TL;DR
CVE-2024-23887 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 grndate parameter in /cupseasylive/grncreate.php. This could lead to session cookie theft when authenticated users visit crafted URLs. Organizations using Cups Easy version 1.0 for inventory management 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 inventory data, financial manipulation, and potential lateral movement within the network.
Likely Case
Session hijacking allowing attackers to perform actions as authenticated users, potentially modifying inventory records or accessing sensitive business data.
If Mitigated
Limited impact with proper input validation and output encoding, though the vulnerability still exists in the codebase.
🎯 Exploit Status
Exploitation requires social engineering to deliver malicious URLs to authenticated users, but the XSS payload itself is straightforward.
🛠️ 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:
No official patch available. Consider implementing input validation and output encoding as workarounds, or replace with a secure alternative.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side validation and sanitization of the grndate parameter to prevent XSS payloads.
Modify /cupseasylive/grncreate.php to validate date format and sanitize input using htmlspecialchars() or similar functions
Web Application Firewall (WAF) Rules
allDeploy WAF rules to block XSS payloads targeting the vulnerable endpoint.
Configure WAF to detect and block requests containing script tags or JavaScript in grndate parameter
🧯 If You Can't Patch
- Restrict access to /cupseasylive/grncreate.php endpoint using network ACLs or authentication requirements
- Implement Content Security Policy (CSP) headers to mitigate impact of successful XSS exploitation
🔍 How to Verify
Check if Vulnerable:
Test by submitting a payload like <script>alert('XSS')</script> in the grndate parameter of /cupseasylive/grncreate.php and check if it executes in browser.Check Version:
Check application version in admin panel or configuration files; version 1.0 is confirmed vulnerable.Verify Fix Applied:
Verify that the same XSS payload no longer executes and appears as plain text in the application output.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /cupseasylive/grncreate.php containing script tags or JavaScript in parameters
- Unusual session activity from same IP with different user agents
Network Indicators:
- Outbound connections to suspicious domains following access to crafted URLs
- Unusual HTTP referer headers containing XSS payloads
SIEM Query:
source="web_logs" AND uri="/cupseasylive/grncreate.php" AND (param="grndate" AND value MATCHES "<script.*>.*</script>" OR "javascript:")