CVE-2022-47717
📋 TL;DR
CVE-2022-47717 is a Cross-Origin Resource Sharing (CORS) misconfiguration vulnerability in Last Yard version 22.09.8-1 that allows malicious websites to make unauthorized requests to the vulnerable application. This affects organizations using the vulnerable Last Yard version, potentially exposing sensitive data to attackers.
💻 Affected Systems
- Last Yard
📦 What is this software?
Last Yard by Lastyard
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal sensitive user data, perform unauthorized actions on behalf of authenticated users, or compromise the entire application through chained attacks.
Likely Case
Data exfiltration of user information and session hijacking through cross-origin requests from malicious websites.
If Mitigated
Limited impact with proper CORS policies, but still potential for information disclosure if other vulnerabilities exist.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious website) but technical complexity is low.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later versions after 22.09.8-1
Vendor Advisory: https://github.com/l00neyhacker/CVE-2022-47717
Restart Required: Yes
Instructions:
1. Upgrade Last Yard to a version after 22.09.8-1
2. Restart the Last Yard service
3. Verify CORS headers are properly configured
🔧 Temporary Workarounds
Configure CORS Headers
allManually configure proper CORS headers to restrict cross-origin requests
Configure web server (nginx/apache) or application to set appropriate Access-Control-Allow-Origin headers
Web Application Firewall Rules
allImplement WAF rules to block malicious cross-origin requests
Add WAF rules to inspect and block improper CORS headers
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers
- Deploy reverse proxy with CORS validation
- Isolate vulnerable system from internet access
- Monitor for suspicious cross-origin requests
🔍 How to Verify
Check if Vulnerable:
Check if Last Yard version is 22.09.8-1 and test CORS headers using browser developer tools or curl: curl -I -H "Origin: http://evil.com" https://target-urlCheck Version:
Check Last Yard configuration files or admin interface for version informationVerify Fix Applied:
Verify version is updated and test CORS headers no longer allow unauthorized origins📡 Detection & Monitoring
Log Indicators:
- Unusual cross-origin requests
- Requests with suspicious Origin headers
- Failed CORS preflight requests
Network Indicators:
- HTTP requests with Origin headers to sensitive endpoints
- CORS preflight OPTIONS requests
SIEM Query:
http.method:OPTIONS AND http.headers.origin:* NOT http.headers.origin:trusted-domain