CVE-2025-0462: Lingdang CRM SQL Injection Vulnerability

CVE-2025-0462 Overview

A critical SQL injection vulnerability has been identified in Shanghai Lingdang Information Technology's Lingdang CRM software, affecting versions up to 8.6.0.0. The vulnerability exists in the file /crm/weixinmp/index.php and can be exploited through manipulation of the searchcontent parameter. This flaw allows remote authenticated attackers to inject malicious SQL queries, potentially leading to unauthorized data access, modification, or deletion within the application's database.

Critical Impact

Remote attackers with low-privilege access can exploit this SQL injection vulnerability to compromise database integrity, extract sensitive customer relationship management data, and potentially escalate their access within the affected Lingdang CRM installations.

Affected Products

• 51mis Lingdang CRM versions up to 8.6.0.0
• Lingdang CRM WeChat mini-program integration module
• Systems exposing the vulnerable /crm/weixinmp/index.php endpoint

Discovery Timeline

• 2025-01-14 - CVE-2025-0462 published to NVD
• 2025-08-28 - Last updated in NVD database

Technical Details for CVE-2025-0462

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) stems from improper neutralization of special elements used in SQL commands within the Lingdang CRM application. The vulnerable endpoint processes user-supplied input through the searchcontent parameter without adequate sanitization or parameterized query usage. When an attacker manipulates this parameter with specially crafted SQL statements, the application directly incorporates the malicious input into database queries, bypassing intended access controls.

The vulnerability is classified under both CWE-89 (SQL Injection) and CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), indicating that the root cause involves insufficient input validation that allows injection attacks. The exploit has been publicly disclosed, and the vendor did not respond to early disclosure attempts, leaving users without an official patch.

Root Cause

The root cause of CVE-2025-0462 is the failure to properly sanitize or parameterize user-controlled input in the searchcontent parameter before incorporating it into SQL queries. The vulnerable PHP endpoint at /crm/weixinmp/index.php accepts multiple GET parameters including userid, module, usid, action, and minipro_const_type, but critically fails to validate the searchcontent parameter. This allows attackers to break out of the intended query context and inject arbitrary SQL commands.

Attack Vector

The attack can be initiated remotely over the network by any authenticated user with low-level privileges. The attacker targets the vulnerable endpoint with a crafted HTTP request containing malicious SQL syntax in the searchcontent parameter. No user interaction is required beyond the attacker's own actions. The vulnerable URL pattern is:

/crm/weixinmp/index.php?userid=123&module=Users&usid=1&action=UsersAjax&minipro_const_type=1&searchcontent=[MALICIOUS_SQL]

By injecting SQL payloads such as UNION-based queries, time-based blind injection, or error-based techniques, attackers can extract database contents, enumerate table structures, or modify data. The attack requires authentication but only low-level privileges, making it accessible to any legitimate user account within the CRM system.

Detection Methods for CVE-2025-0462

Indicators of Compromise

• Unusual HTTP requests to /crm/weixinmp/index.php containing SQL metacharacters such as single quotes, double dashes, semicolons, or UNION keywords in the searchcontent parameter
• Database error messages appearing in application logs or responses that reveal SQL syntax errors
• Unexpected database query patterns or high-volume SELECT statements from the CRM application
• Evidence of data exfiltration through out-of-band DNS or HTTP requests from the database server

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in the searchcontent parameter
• Implement database activity monitoring to identify anomalous query patterns or unauthorized data access attempts
• Configure application logging to capture all requests to the vulnerable endpoint with full parameter details
• Use intrusion detection systems (IDS) with SQL injection signature rules focused on the vulnerable URL path

Monitoring Recommendations

• Monitor access logs for requests to /crm/weixinmp/index.php with unusually long or encoded searchcontent values
• Set up alerts for database errors originating from the Lingdang CRM application
• Track authentication events for accounts making repeated requests to the vulnerable endpoint
• Review database audit logs for queries containing injection indicators like UNION SELECT, OR 1=1, or WAITFOR DELAY

How to Mitigate CVE-2025-0462

Immediate Actions Required

• Restrict network access to the Lingdang CRM application to trusted IP addresses only
• Implement Web Application Firewall (WAF) rules to filter SQL injection attempts on the vulnerable endpoint
• Review and audit all user accounts with access to the CRM system, removing unnecessary privileges
• Consider temporarily disabling the WeChat mini-program integration module if not critical to operations

Patch Information

No official vendor patch is currently available. According to the vulnerability disclosure, the vendor (Shanghai Lingdang Information Technology) was contacted early about this issue but did not respond. Organizations should monitor for updates from the vendor and apply patches immediately when released. In the absence of an official fix, implementing compensating controls is critical.

For additional technical details, refer to the VulDB entry and the GitHub documentation referenced in the disclosure.

Workarounds

• Deploy a reverse proxy or WAF configured to sanitize or block requests containing SQL injection patterns in the searchcontent parameter
• Implement network segmentation to isolate the CRM database server from direct application access
• Apply input validation at the network layer using ModSecurity or similar tools with OWASP Core Rule Set
• Consider restricting access to the vulnerable PHP endpoint entirely if the WeChat integration feature is not required

# Example ModSecurity rule to block SQL injection in searchcontent parameter
SecRule ARGS:searchcontent "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    msg:'SQL Injection attempt detected in searchcontent parameter',\
    log,\
    auditlog"