CVE-2024-51557
📋 TL;DR
This vulnerability allows authenticated attackers to send unlimited OTP requests through a vulnerable API endpoint in Wave 2.0, causing OTP bombing/flooding attacks. This affects systems running Wave 2.0 with the vulnerable API endpoint exposed. Attackers need valid authentication credentials to exploit this vulnerability.
💻 Affected Systems
- Wave 2.0
📦 What is this software?
Aero by 63moons
Wave 2.0 by 63moons
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service through OTP flooding, overwhelming the system with requests and potentially causing service disruption or resource exhaustion.
Likely Case
Targeted OTP bombing against specific users or systems, causing service disruption, user frustration, and potential account lockouts.
If Mitigated
Limited impact with proper rate limiting in place, where only legitimate OTP requests are processed within defined thresholds.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple - just repeated API calls to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in CVE
Vendor Advisory: https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2024-0332
Restart Required: Yes
Instructions:
1. Check vendor advisory for patch availability. 2. Apply the official patch from the vendor. 3. Restart the Wave 2.0 service. 4. Verify rate limiting is properly implemented.
🔧 Temporary Workarounds
Implement API Rate Limiting
allAdd rate limiting to the OTP API endpoint to prevent flooding attacks
# Configure rate limiting in your API gateway or application firewall
# Example nginx rate limiting: limit_req_zone $binary_remote_addr zone=otp:10m rate=10r/m;
# Then apply to OTP endpoint: limit_req zone=otp burst=5 nodelay;
Web Application Firewall Rules
allConfigure WAF rules to detect and block OTP flooding patterns
# Example ModSecurity rule: SecRule REQUEST_URI "@rx /api/otp" "id:1001,phase:1,deny,status:429,msg:'OTP rate limit exceeded'"
🧯 If You Can't Patch
- Implement network-level rate limiting using load balancers or API gateways
- Monitor OTP request patterns and implement alerting for abnormal volumes
🔍 How to Verify
Check if Vulnerable:
Test the OTP API endpoint by sending multiple rapid requests and checking if rate limiting is enforcedCheck Version:
# Check Wave version: wave --version or check application configuration filesVerify Fix Applied:
Attempt to send multiple OTP requests in quick succession and verify requests are throttled or blocked after threshold📡 Detection & Monitoring
Log Indicators:
- Multiple OTP requests from same source IP in short timeframe
- 429 Too Many Requests errors in logs
- Unusual spike in OTP-related API calls
Network Indicators:
- High volume of POST requests to OTP endpoint
- Repeated API calls with same authentication tokens
- Abnormal request patterns from single IP addresses
SIEM Query:
source="wave.log" AND "OTP" AND count by src_ip > 10 within 1m