CVE-2023-51906
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on yonyou YonBIP systems by sending a crafted script to the ServiceDispatcherServlet component. It affects yonyou YonBIP v3_23.05 installations, potentially compromising entire enterprise systems.
💻 Affected Systems
- yonyou YonBIP
📦 What is this software?
Yonbip by Yonyou
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, data exfiltration, ransomware deployment, and lateral movement across the network.
Likely Case
Remote code execution leading to data theft, system compromise, and potential business disruption.
If Mitigated
Limited impact with proper network segmentation, WAF rules, and monitoring in place.
🎯 Exploit Status
Public proof-of-concept available on GitHub, exploitation appears straightforward
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.yonyou.com/
Restart Required: No
Instructions:
Check vendor website for security updates and apply any available patches immediately
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to ServiceDispatcherServlet endpoints
iptables -A INPUT -p tcp --dport [YonBIP_PORT] -s [TRUSTED_IPS] -j ACCEPT
iptables -A INPUT -p tcp --dport [YonBIP_PORT] -j DROP
Web Application Firewall Rules
allBlock malicious requests to vulnerable endpoints
WAF rule: Block requests containing suspicious patterns to /ServiceDispatcherServlet
🧯 If You Can't Patch
- Isolate affected systems from internet and restrict internal network access
- Implement strict monitoring and alerting for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if system is running YonBIP v3_23.05 and has ServiceDispatcherServlet accessibleCheck Version:
Check application version in admin interface or configuration filesVerify Fix Applied:
Verify version has been updated beyond v3_23.05 or test for vulnerability using safe methods📡 Detection & Monitoring
Log Indicators:
- Unusual requests to ServiceDispatcherServlet
- Suspicious script execution patterns
- Unexpected process creation
Network Indicators:
- HTTP requests to /ServiceDispatcherServlet with crafted payloads
- Outbound connections from YonBIP to unknown destinations
SIEM Query:
source="YonBIP" AND (uri="*ServiceDispatcherServlet*" AND (payload="*script*" OR payload="*exec*"))