CVE-2020-22807
📋 TL;DR
CVE-2020-22807 is a critical SQL injection vulnerability in vtiger CRM's calendar export feature that allows attackers to execute arbitrary SQL commands. This affects vtiger CRM 7.2 installations, potentially exposing sensitive database information. Attackers can exploit this to steal data, modify database contents, or gain unauthorized access.
💻 Affected Systems
- vtiger CRM
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data manipulation, privilege escalation, and potential remote code execution through database functions.
Likely Case
Unauthorized access to sensitive CRM data including customer information, business records, and potentially authentication credentials stored in the database.
If Mitigated
Limited impact with proper input validation, parameterized queries, and database user privilege restrictions in place.
🎯 Exploit Status
SQL injection via UNION-based technique. Requires some level of access to the calendar export feature, but authentication requirements may vary by configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.1 or later
Vendor Advisory: https://www.vtiger.com/
Restart Required: No
Instructions:
1. Backup your vtiger CRM installation and database. 2. Download the latest version from vtiger's official website. 3. Follow vtiger's upgrade documentation for version 7.2.1 or later. 4. Verify the calendar export feature no longer accepts malicious input.
🔧 Temporary Workarounds
Disable Calendar Export Feature
allTemporarily disable the vulnerable calendar exportdata feature until patching can be completed.
Modify vtiger configuration to remove/disable calendar export functionality
Restrict access to calendar module via .htaccess or web server configuration
Implement WAF Rules
allAdd web application firewall rules to block SQL injection patterns targeting the calendar export endpoint.
Add ModSecurity rules for SQL injection detection
Configure WAF to monitor /index.php?module=Calendar&action=ExportData
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries for all calendar module functions
- Restrict database user permissions to minimum required privileges and implement database activity monitoring
🔍 How to Verify
Check if Vulnerable:
Test the calendar export feature with SQL injection payloads. Check if the application version is 7.2. Review source code for lack of parameterized queries in ExportData action.Check Version:
Check vtiger CRM version in the application footer or admin panel, or examine the vtigercrm_version table in the database.Verify Fix Applied:
Verify the application version is 7.2.1 or later. Test the calendar export feature with SQL injection payloads to confirm they're rejected. Review that parameterized queries are implemented in the ExportData functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by calendar export requests
- Requests to /index.php?module=Calendar&action=ExportData with SQL keywords
Network Indicators:
- Unusual outbound database connections from web server
- Large data exports from calendar endpoints
- SQL error messages in HTTP responses
SIEM Query:
source="web_logs" AND (uri="*ExportData*" AND (payload="*UNION*" OR payload="*SELECT*" OR payload="*FROM*"))