CVE-2025-8219: Lingdang CRM SQL Injection Vulnerability

CVE-2025-8219 Overview

A SQL Injection vulnerability has been identified in Shanghai Lingdang Information Technology's Lingdang CRM versions up to 8.6.4.7. This vulnerability exists in the HTTP POST Request Handler component, specifically within the file /crm/crmapi/erp/tabdetail_moduleSave_dxkp.php. Attackers can exploit this flaw by manipulating the getvaluestring parameter, enabling them to inject malicious SQL commands and potentially compromise the underlying database.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive customer data, modify database records, or potentially gain unauthorized access to the CRM system's backend database through crafted HTTP POST requests.

Affected Products

• 51mis Lingdang CRM versions up to 8.6.4.7

Discovery Timeline

• 2025-07-27 - CVE CVE-2025-8219 published to NVD
• 2025-08-28 - Last updated in NVD database

Technical Details for CVE-2025-8219

Vulnerability Analysis

This vulnerability is classified as SQL Injection (CWE-89) and more broadly as Injection (CWE-74). The vulnerable endpoint /crm/crmapi/erp/tabdetail_moduleSave_dxkp.php fails to properly sanitize user-supplied input in the getvaluestring parameter before incorporating it into SQL queries. This allows attackers to inject arbitrary SQL commands that are then executed by the database server.

The attack can be initiated remotely over the network, requiring only low privileges to exploit. No user interaction is required for successful exploitation. While the vulnerability allows for limited confidentiality, integrity, and availability impacts on the vulnerable system, it does not extend to subsequent systems.

Root Cause

The root cause of this vulnerability is improper input validation and the use of unsanitized user input in SQL query construction. The getvaluestring parameter value is directly concatenated into SQL statements without proper parameterization or input sanitization, creating a classic SQL injection attack surface.

Attack Vector

The attack vector is network-based, targeting the HTTP POST Request Handler. An authenticated attacker with low privileges can send specially crafted HTTP POST requests to the vulnerable endpoint. By manipulating the getvaluestring parameter with SQL injection payloads, the attacker can:

1. Extract sensitive data from the CRM database including customer information
2. Modify or delete database records
3. Potentially escalate privileges within the application
4. Bypass authentication mechanisms in certain scenarios

The vulnerability is exploited by sending malicious input through the getvaluestring parameter to the /crm/crmapi/erp/tabdetail_moduleSave_dxkp.php endpoint. Common SQL injection techniques such as UNION-based injection, boolean-based blind injection, or time-based blind injection may be applicable depending on the application's response behavior. For detailed technical analysis, refer to the SQL Injection Vulnerability Analysis on Notion.

Detection Methods for CVE-2025-8219

Indicators of Compromise

• HTTP POST requests to /crm/crmapi/erp/tabdetail_moduleSave_dxkp.php containing SQL syntax or special characters in the getvaluestring parameter
• Database error messages in application logs indicating SQL syntax errors or unexpected query behavior
• Unusual database query patterns including UNION SELECT statements, sleep functions, or benchmark commands
• Unauthorized data access or modifications in CRM database tables

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP POST parameters
• Configure database activity monitoring to alert on anomalous queries originating from the CRM application
• Deploy network-based intrusion detection systems with signatures for SQL injection payloads
• Enable detailed application logging for the vulnerable endpoint to capture suspicious parameter values

Monitoring Recommendations

• Monitor HTTP POST traffic to /crm/crmapi/erp/tabdetail_moduleSave_dxkp.php for injection patterns
• Set up alerts for database errors and exceptions that may indicate exploitation attempts
• Review database audit logs for unauthorized SELECT, UPDATE, INSERT, or DELETE operations
• Track authentication and authorization events for privilege escalation indicators

How to Mitigate CVE-2025-8219

Immediate Actions Required

• Upgrade Lingdang CRM to version 8.6.5.2 or later immediately
• If immediate upgrade is not possible, restrict network access to the vulnerable endpoint
• Implement WAF rules to filter SQL injection patterns on the affected parameter
• Review database logs for signs of prior exploitation and assess data integrity

Patch Information

The vendor, Shanghai Lingdang Information Technology, has released version 8.6.5.2 which addresses this vulnerability. According to the vendor statement: "All SQL injection vectors were patched via parameterized queries and input sanitization in v8.6.5+. We strongly advise all customers to upgrade to the current version (v8.6.5.2), which includes this fix and additional security enhancements."

The fix implements parameterized queries and proper input sanitization for all affected endpoints. For additional information, consult the VulDB entry #317807 for this vulnerability.

Workarounds

• Deploy a Web Application Firewall configured to block SQL injection patterns in the getvaluestring parameter
• Implement network segmentation to limit access to the CRM system from trusted networks only
• Disable or restrict access to the /crm/crmapi/erp/tabdetail_moduleSave_dxkp.php endpoint if not required for business operations
• Apply input validation at the network perimeter level using a reverse proxy with filtering capabilities

# Example WAF rule configuration for blocking SQL injection (generic format)
# Block requests containing common SQL injection patterns in POST parameters
# SecRule ARGS:getvaluestring "@detectSQLi" "id:1001,phase:2,deny,status:403,log,msg:'SQL Injection Attempt Detected'"