CVE-2024-58385 in U8 CRM
Summary
by MITRE • 09/15/2026
Yonyou U8 CRM contains an unauthenticated SQL injection vulnerability in the fillbacksettingedit.php configuration endpoint where the DontCheckLogin=1 parameter bypasses authentication and the id parameter is incorporated into SQL queries without sanitization. Attackers can exploit this flaw to execute arbitrary SQL commands and, on Microsoft SQL Server deployments with xp_cmdshell enabled, write backdoor files and execute arbitrary operating system commands. Exploitation evidence was first observed by the Shadowserver Foundation on 2025-02-13.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability identified in Yonyou U8 CRM represents a critical security flaw rooted in improper input validation and authentication bypass mechanisms within the application's configuration management module. Specifically, the fillbacksettingedit.php endpoint contains an unauthenticated SQL injection vector that allows remote attackers to interfere with database queries executed by the backend system. The core of this vulnerability lies in the DontCheckLogin parameter, which when set to 1, effectively disables standard authentication checks for the request. This design flaw permits any external actor to access sensitive administrative functions without valid credentials, fundamentally undermining the application's security model and exposing internal configuration data and logic to unauthorized manipulation.
The technical mechanism of exploitation involves the id parameter being directly concatenated into SQL statements without adequate sanitization or the use of prepared statements. Because the input is not properly escaped, an attacker can inject malicious SQL code that alters the intended query structure. This allows for a range of attacks including data exfiltration, modification of critical system settings, and deletion of database records. The severity escalates significantly when the underlying database management system is Microsoft SQL Server with xp_cmdshell enabled. In such environments, the injected SQL commands can invoke extended stored procedures that provide direct access to the operating system shell. This capability transforms a standard web application vulnerability into a full remote code execution scenario, allowing attackers to write backdoor files, download additional malware payloads, or execute arbitrary commands on the host server with the privileges of the database service account.
The operational impact of this vulnerability is severe, potentially leading to complete compromise of the affected Yonyou U8 CRM instance and any systems accessible from its network segment. Once an attacker gains command execution capabilities via xp_cmdshell, they can pivot further into the corporate network, steal sensitive customer data stored in the CRM, or disrupt business operations by corrupting database integrity. The presence of this vulnerability was first observed in the wild by the Shadowserver Foundation on February 13, 2025, indicating active exploitation campaigns targeting organizations that have not yet applied mitigations. This real-world activity underscores the urgency for immediate remediation efforts to prevent unauthorized access and potential data breaches.
From a classification perspective, this vulnerability aligns with CWE-89 Improper Neutralization of Special Elements used in an SQL Command, which describes the failure to neutralize special elements within SQL queries that could alter their meaning. Additionally, the authentication bypass aspect corresponds to CWE-287 Improper Authentication, as the DontCheckLogin parameter allows access without proper identity verification. In terms of attack tactics, this flaw facilitates initial access and privilege escalation techniques documented in the MITRE ATT&CK framework, particularly those involving SQL injection for data extraction or command execution on database servers hosting vulnerable applications like Microsoft SQL Server.
To mitigate this risk, organizations should immediately apply vendor-provided patches that address the authentication bypass and input validation flaws in the fillbacksettingedit.php endpoint. If patching is not immediately feasible, network-level controls such as web application firewalls can be configured to block requests containing DontCheckLogin=1 or suspicious SQL injection patterns targeting the id parameter. Furthermore, administrators should review database configurations to ensure that xp_cmdshell is disabled unless strictly required for specific administrative tasks, and if enabled, it should be restricted to high-privilege accounts with rigorous monitoring. Regular vulnerability assessments and penetration testing are recommended to identify similar misconfigurations or unpatched components within the Yonyou U8 ecosystem before they can be exploited by malicious actors.