Summary
Fumasoft Fumeng Cloud contains a SQL injection vulnerability in the AjaxMethod.ashx endpoint, where the Name parameter for the getEmpByname action is incorporated into database queries without adequate safeguards.
Because the endpoint is reachable without authentication, a remote attacker may inject SQL statements to read or alter Microsoft SQL Server data and potentially pursue further compromise.
Affected context
The vulnerability occurs in deployments of Fumeng Cloud that expose the AjaxMethod.ashx endpoint and process the Name parameter for the getEmpByname action through dynamically constructed SQL queries. Risk is greatest when the endpoint is internet-accessible, accepts unauthenticated requests, and the application database account has broad permissions.
Exploit preconditions
- Attack surface: The remotely accessible
AjaxMethod.ashxHTTP endpoint - Required access: No authentication is required according to the vulnerability description
- Trigger point: Processing the
Nameparameter for thegetEmpBynameaction - Backend condition: The parameter must reach a Microsoft SQL Server query without effective parameterization or equivalent query separation
- Why exploitation is possible: Attacker-controlled input can alter the intended SQL statement and influence database operations
Why this happens
The underlying bug is insufficient separation between untrusted request data and SQL command structure. When the Name parameter is concatenated into or otherwise interpreted as part of a database query, specially crafted input can change the query's logic, including through UNION-based query composition.
This maps to CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'). The insecure pattern is treating external input as executable SQL syntax rather than as a value constrained by a parameterized data-access interface.
Potential impact
- An attacker may retrieve sensitive database records
- Database contents could be disclosed, modified, or deleted
- Application authentication or authorization data could be exposed
- Data integrity could be compromised through unauthorized changes
- The application or underlying server could face further compromise
- Exploitation could support broader organizational or supply-chain impact
General mitigation guidance
Mitigation generally focuses on ensuring that user-controlled values cannot become SQL syntax and on reducing the privileges available to the application.
Common defensive patterns include:
- Using parameterized queries or prepared statements for all database operations
- Avoiding dynamic SQL construction from request parameters
- Applying allowlist validation appropriate to the expected Name value
- Enforcing server-side input constraints without relying on client-side checks
- Limiting the database account to the minimum required permissions
- Separating application and administrative database identities
- Returning generic database errors rather than query details
- Restricting unnecessary public exposure of administrative or data-access endpoints
How teams detect issues like this
Organizations can look for SQL injection risks through:
- Static analysis rules that identify string concatenation or interpolation in SQL execution paths
- Code review checks for direct use of HTTP parameters in query construction
- Dynamic testing of endpoint parameters using controlled security test cases
- Web application firewall or API gateway policies that detect suspicious database-language patterns
- Database audit logs showing anomalous UNION activity, unexpected queries, or unusual data access
- Monitoring for unauthenticated access to sensitive Ajax endpoints
Automated application-security review tools may help identify unsafe data-access patterns, but findings should be validated against the application's query and authorization design.
