CVE-2025-27393
Remediation/Mitigation Strategy for CVE-2025-27393
Vulnerability Description:
- Vulnerability: Improper Input Sanitization During User Creation
- Affected Product: SCALANCE LPE9403 (6GK5998-3GS00-2AC2)
- Affected Versions: All versions prior to V4.0
- Description: The SCALANCE LPE9403 device fails to properly sanitize user input when creating new users. This flaw could allow an attacker to inject malicious code via the user creation process.
Severity:
- CVSS Score: 8.6 (High)
- CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Impact: This vulnerability allows for arbitrary code execution on the affected device, potentially leading to complete system compromise. This includes:
- Confidentiality Impact: High - Sensitive data stored on the device could be accessed and stolen.
- Integrity Impact: High - The device’s configuration and functionality can be modified by the attacker.
- Availability Impact: High - The device can be rendered unusable, disrupting network operations.
Known Exploits:
- The vulnerability details indicate that a highly privileged, authenticated, remote attacker can exploit this flaw, meaning an attacker with existing administrative access can leverage this to gain full control of the system. While no public proof-of-concept exploit code is mentioned, the provided information strongly suggests the exploit is possible.
- Exploitability: Exploitable by authenticated users with high privileges.
- Complexity: Likely low due to the direct nature of input sanitization issues.
- Remote: Exploitable remotely, increasing the risk and reach of potential attacks.
Remediation and Mitigation Strategies:
Immediate Action: Upgrade Firmware:
- Recommendation: Upgrade the SCALANCE LPE9403 device to version V4.0 or later immediately. Siemens has likely addressed the input sanitization issue in this version. This is the primary and most effective remediation step.
- Verification: After upgrading, thoroughly test the user creation process to ensure the vulnerability has been resolved.
Temporary Mitigations (If Firmware Upgrade is Not Immediately Possible):
- Restrict Access: Limit access to the SCALANCE LPE9403 device to only authorized personnel with a legitimate need. Implement strong access control lists (ACLs) and firewall rules to restrict network access to the device’s management interface.
- Strict Input Validation: While not a replacement for proper firmware updates, implement strict input validation practices wherever possible on any interfaces interacting with the SCALANCE LPE9403. This may involve custom scripts or monitoring tools. This is not a comprehensive solution and should only be used as a temporary measure.
- Monitor Logs: Enable and closely monitor system logs for suspicious activity, especially related to user creation attempts. Look for unusual characters, commands, or patterns in the input data.
- Principle of Least Privilege: Ensure users are only granted the minimum privileges necessary for their roles. Remove any unnecessary administrative accounts.
- Network Segmentation: Segment the network where the SCALANCE LPE9403 is located to limit the potential impact of a successful exploit.
Long-Term Security Practices:
- Regular Firmware Updates: Establish a process for regularly checking and applying firmware updates to all network devices, including the SCALANCE LPE9403. Subscribe to Siemens’ security advisories to receive notifications about new vulnerabilities.
- Vulnerability Scanning: Implement a vulnerability scanning program to proactively identify and address security weaknesses in network devices and applications.
- Secure Configuration Management: Use a secure configuration management tool to enforce consistent and secure configurations across all devices.
- Security Awareness Training: Provide regular security awareness training to employees to educate them about potential threats and best practices.
Communication:
- Inform all relevant personnel (IT staff, security team, network administrators) about the vulnerability and the remediation steps.
- Communicate the urgency of the situation and the potential impact of a successful exploit.
Disclaimer:
This remediation/mitigation strategy is based on the information provided. The specific steps required may vary depending on the organization’s environment and security policies. It is recommended to consult with security experts for further guidance.
Assigner
- Siemens AG [email protected]
Date
- Published Date: 2025-03-11 09:48:24
- Updated Date: 2025-03-11 10:15:18