CVE-2020-7356
📋 TL;DR
CAYIN xPost has an unauthenticated SQL injection vulnerability in the 'wayfinder_seqid' parameter of wayfinder_meeting_input.jsp. Attackers can inject arbitrary SQL code to execute system commands, potentially compromising the entire server. All unpatched CAYIN xPost systems are affected.
💻 Affected Systems
- CAYIN xPost
📦 What is this software?
Xpost by Cayintech
Xpost by Cayintech
Xpost by Cayintech
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing remote code execution, data exfiltration, and complete control of the affected server.
Likely Case
Database compromise leading to data theft, manipulation, or destruction, with potential for lateral movement within the network.
If Mitigated
Limited impact if proper input validation and parameterized queries are implemented, though some information disclosure may still occur.
🎯 Exploit Status
Metasploit module available, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version - check vendor advisory
Vendor Advisory: Not provided in references
Restart Required: Yes
Instructions:
1. Contact CAYIN for patch information 2. Apply vendor-provided patch 3. Restart the xPost service 4. Verify the fix is applied
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy a WAF with SQL injection protection rules to block malicious requests
Network Segmentation
linuxRestrict access to the vulnerable endpoint to trusted IP addresses only
iptables -A INPUT -p tcp --dport [xPost_port] -s [trusted_ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [xPost_port] -j DROP
🧯 If You Can't Patch
- Take the system offline immediately
- Implement strict network segmentation and isolate the vulnerable system
🔍 How to Verify
Check if Vulnerable:
Test the wayfinder_meeting_input.jsp endpoint with SQL injection payloads in the wayfinder_seqid parameterCheck Version:
Check xPost administration interface or configuration files for version informationVerify Fix Applied:
Attempt SQL injection after patch application - successful attacks should be blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SQL syntax in URL parameters
- Multiple failed SQL queries from single IP
- Requests to wayfinder_meeting_input.jsp with suspicious parameters
Network Indicators:
- SQL keywords in HTTP GET requests
- Unusual outbound connections from xPost server
- Traffic patterns indicating data exfiltration
SIEM Query:
source="xpost_logs" AND (url="*wayfinder_meeting_input.jsp*" AND (param="*UNION*" OR param="*SELECT*" OR param="*INSERT*" OR param="*DELETE*"))