CVE-2025-15242
📋 TL;DR
A race condition vulnerability exists in PHPEMS coupon handling functionality, allowing attackers to potentially manipulate coupon redemption processes. This affects PHPEMS versions up to 11.0. Attackers could exploit this to gain unauthorized benefits through coupon manipulation.
💻 Affected Systems
- PHPEMS
📦 What is this software?
Phpems by Phpems
⚠️ Risk & Real-World Impact
Worst Case
Attackers could exploit the race condition to bypass coupon usage limits, potentially allowing unlimited coupon redemption leading to financial loss or service abuse.
Likely Case
Limited coupon manipulation allowing some unauthorized discounts or service access beyond intended limits.
If Mitigated
Proper transaction locking and validation would prevent successful exploitation, maintaining normal coupon functionality.
🎯 Exploit Status
Exploit requires precise timing and multiple concurrent requests. Public proof-of-concept demonstrates the race condition exploitation technique.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Monitor PHPEMS releases for updates beyond version 11.0. Consider implementing workarounds or migrating to alternative solutions.
🔧 Temporary Workarounds
Implement Transaction Locking
allAdd proper transaction locking mechanisms to coupon redemption processes to prevent race conditions
Modify coupon handling code to use database transactions with proper locking (e.g., SELECT FOR UPDATE in MySQL)
Rate Limit Coupon Requests
allImplement rate limiting on coupon redemption endpoints to reduce race condition exploitation opportunities
Configure web server or application rate limiting for /coupon endpoints
🧯 If You Can't Patch
- Disable coupon functionality entirely if not essential for business operations
- Implement web application firewall (WAF) rules to detect and block rapid consecutive coupon requests
🔍 How to Verify
Check if Vulnerable:
Check PHPEMS version. If version is 11.0 or earlier and coupon functionality is enabled, the system is vulnerable.Check Version:
Check PHPEMS configuration files or admin panel for version informationVerify Fix Applied:
Test coupon redemption with concurrent requests to verify proper transaction locking prevents race conditions.📡 Detection & Monitoring
Log Indicators:
- Multiple rapid coupon redemption attempts from same IP/user
- Unusual coupon usage patterns exceeding normal limits
Network Indicators:
- High frequency of requests to coupon redemption endpoints
- Concurrent requests to same coupon endpoint
SIEM Query:
source="web_logs" AND (uri_path="/coupon/redeem" OR uri_path="/coupon/use") AND count > 5 within 1 second