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CVE-2024-58385 – Unauthenticated SQL Injection / RCE – Yonyou U8 CRM (versions 13, 15.1, 16.0, 16.1,

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Summary

CVE-2024-58385 is an unauthenticated SQL injection vulnerability in Yonyou U8 CRM, a Chinese enterprise CRM/ERP module widely deployed by businesses across China and other regions. The flaw resides in the fillbacksettingedit.php endpoint, where a bypass parameter allows attackers to skip authentication and inject SQL through an unsanitized request parameter. The issue carries a critical severity rating and has reportedly been exploited in the wild.

Technical details

  • Root cause: the id parameter passed to fillbacksettingedit.php is concatenated into a SQL query without proper sanitization or parameterization (CWE-89).
  • Trigger condition: the request additionally sets DontCheckLogin=1, a parameter that bypasses the application’s normal authentication check, allowing the endpoint to be reached without valid credentials.
  • Attack vector: network-based, requiring no authentication and no user interaction, against the exposed U8 CRM web interface.
  • Impact: an attacker can execute arbitrary SQL statements against the backend database. On deployments running Microsoft SQL Server with xp_cmdshell enabled, this can be leveraged to write backdoor files to disk and execute arbitrary operating system commands, resulting in full system compromise.
  • Exploitation in the wild was first observed and reported by a third-party threat monitoring organization in February 2025.

Affected software

  • Yonyou U8 CRM version 18
  • Yonyou U8 CRM version 16.5
  • Yonyou U8 CRM version 16.1
  • Yonyou U8 CRM version 16.0
  • Yonyou U8 CRM version 15.1
  • Yonyou U8 CRM version 13

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical) — Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 Base Score: 9.3 (Critical) — Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Apply the official patch or update published by Yonyou for the affected U8 CRM versions via the vendor’s security advisory channel; confirm the fix addresses fillbacksettingedit.php input validation and the DontCheckLogin bypass.
  • If no patch can be applied immediately:
    • Restrict network access to the U8 CRM web application to trusted internal networks or VPN only; do not expose it directly to the internet.
    • Disable or restrict use of xp_cmdshell on the backing Microsoft SQL Server instance to reduce the impact of any successful SQL injection.
    • Deploy a web application firewall (WAF) rule to block requests containing DontCheckLogin=1 combined with suspicious payloads in the id parameter to fillbacksettingedit.php.
    • Monitor database and web server logs for anomalous queries or unexpected file writes consistent with exploitation attempts.

References

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