CVE-2020-28087
📋 TL;DR
This SQL injection vulnerability in jeecg-boot CMS allows attackers to execute arbitrary SQL commands through the /jeecg boot/sys/dict/loadtreedata endpoint. Attackers can access, modify, or delete sensitive database information. Organizations using jeecg-boot CMS version 2.3 are affected.
💻 Affected Systems
- jeecg-boot CMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data exfiltration, data manipulation, privilege escalation, and potential system takeover.
Likely Case
Unauthorized access to sensitive data stored in the database, potentially including user credentials, personal information, and system configuration.
If Mitigated
Limited impact with proper input validation, parameterized queries, and database permission restrictions in place.
🎯 Exploit Status
SQL injection vulnerabilities are commonly exploited and tools exist for automated exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2.3
Vendor Advisory: https://github.com/zhangdaiscott/jeecg-boot/issues/1887
Restart Required: Yes
Instructions:
1. Upgrade jeecg-boot to a version after 2.3. 2. Apply the patch from the GitHub issue. 3. Restart the application server. 4. Verify the fix by testing the vulnerable endpoint.
🔧 Temporary Workarounds
Input Validation Filter
allImplement input validation to reject malicious SQL characters in the loadtreedata endpoint parameters.
Implement parameter validation in the affected Java controller class
WAF Rule
allDeploy a web application firewall with SQL injection detection rules.
Configure WAF to block requests containing SQL injection patterns to /jeecg boot/sys/dict/loadtreedata
🧯 If You Can't Patch
- Block external access to the vulnerable endpoint using network ACLs or firewall rules.
- Implement database-level controls: restrict application database user permissions to minimum required.
🔍 How to Verify
Check if Vulnerable:
Test the /jeecg boot/sys/dict/loadtreedata endpoint with SQL injection payloads like ' OR '1'='1.Check Version:
Check the jeecg-boot version in the application configuration or pom.xml file.Verify Fix Applied:
Attempt SQL injection against the patched endpoint and verify it rejects malicious input.📡 Detection & Monitoring
Log Indicators:
- Unusual database queries from the application
- Multiple failed login attempts or parameter manipulation in access logs
Network Indicators:
- SQL error messages in HTTP responses
- Unusual patterns of requests to the loadtreedata endpoint
SIEM Query:
source="web_logs" AND uri="/jeecg boot/sys/dict/loadtreedata" AND (message="SQL" OR message="syntax" OR message="error")