CVE-2025-27494

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Vulnerability Remediation and Mitigation Strategy: CVE-2025-27494

1. Vulnerability Description

  • Vulnerability: Improper Input Sanitization in REST API Pubkey Endpoint
  • Affected Products:
    • SiPass integrated AC5102 (ACC-G2) (All versions < V6.4.9)
    • SiPass integrated ACC-AP (All versions < V6.4.9)
  • Description: The affected SiPass integrated systems fail to properly sanitize input received by the pubkey endpoint of their REST API. An authenticated remote administrator can exploit this flaw by injecting arbitrary commands. These injected commands are then executed with root privileges, potentially leading to full system compromise.

2. Severity Assessment

  • CVSS Score: 9.4 (Critical)
    • AV:N (Network)
    • AC:L (Low)
    • PR:H (High) - Requires administrator level access. However, once obtained, the impact is significant.
    • UI:N (None)
    • S:C (Changed) - Vulnerable code is not in the same protection domain.
    • C:H (High) - Complete Confidentiality impact.
    • I:H (High) - Complete Integrity impact.
    • A:H (High) - Complete Availability impact.
  • Severity: Critical. This vulnerability allows for complete system compromise and potentially lateral movement within the network, impacting confidentiality, integrity, and availability.

3. Known Exploitation

  • Exploitability: Exploitable. The vulnerability is reachable via the network and requires only an authenticated administrator, which simplifies exploitation. Input sanitization failures are typically well-understood attack vectors.
  • Root Cause: Lack of proper input validation/sanitization before processing data received by the pubkey REST API endpoint. This allows for command injection.

4. Remediation Strategy

The primary remediation is to upgrade to the latest versions (V6.4.9 or later) of SiPass integrated AC5102 (ACC-G2) and SiPass integrated ACC-AP. Siemens has likely released a patch addressing this specific vulnerability in the updated versions.

5. Mitigation Strategies (Until Patching is Possible)

If an immediate upgrade is not feasible, consider the following mitigation strategies to reduce the risk:

  • Network Segmentation: Isolate the affected SiPass integrated systems onto a separate network segment with restricted access. Minimize the systems that can communicate with the vulnerable devices.
  • Access Control: Enforce strict access control policies for administrator accounts. Review and limit the number of users with administrative privileges. Implement strong password policies (complexity, rotation) and multi-factor authentication (MFA) where possible.
  • Web Application Firewall (WAF) or Intrusion Detection/Prevention System (IDS/IPS): Configure a WAF or IDS/IPS to monitor traffic to the pubkey endpoint of the REST API. Implement rules to detect and block suspicious requests that may contain command injection attempts. Look for unusual characters, command delimiters, or patterns indicative of exploitation. Consider rate limiting requests to the pubkey endpoint.
  • REST API Hardening: If possible, configure the REST API to only accept requests from specific, known IP addresses or networks. Disable or restrict access to the pubkey endpoint if it is not actively used.
  • Monitoring and Logging: Enhance logging of all REST API requests, particularly to the pubkey endpoint. Monitor these logs for any suspicious activity or errors. Configure alerts to notify security personnel of potential exploitation attempts. Focus on logging input values to the pubkey endpoint.
  • Vendor Communication: Contact Siemens support ([email protected]) to confirm the available patch and any specific mitigation recommendations they may have. Inquire about the specifics of the input sanitization flaw to better inform mitigation strategies.
  • Temporary Shutdown: As a last resort, if the risk is deemed too high and other mitigations are insufficient, consider temporarily shutting down the affected SiPass integrated systems until a patch can be applied.

6. Post-Remediation Steps

  • Vulnerability Scanning: After applying the patch, conduct a vulnerability scan to verify that CVE-2025-27494 has been successfully resolved.
  • Penetration Testing: Consider performing a penetration test to validate the effectiveness of the patch and identify any other potential vulnerabilities.
  • Security Audits: Regularly review and update security policies and procedures to prevent similar vulnerabilities from occurring in the future.
  • Stay Informed: Subscribe to security advisories from Siemens and other relevant sources to stay informed about the latest security threats and vulnerabilities.

7. Contact Information

Explanation of Key Elements:

  • Clarity and Organization: The Markdown format allows for clear headings, bullet points, and concise descriptions.
  • Comprehensive Coverage: The strategy addresses vulnerability details, severity, known exploitation, remediation steps, mitigation options, and post-remediation activities.
  • Prioritization: The mitigation strategies are presented in a prioritized order, starting with the most effective (patching) and progressing to less impactful but still valuable measures.
  • Actionable Guidance: The strategy provides specific, actionable steps that security teams can take to address the vulnerability.
  • Realism: The strategy acknowledges that patching may not always be immediately feasible and offers alternative mitigation options.
  • Focus on Root Cause: The strategy highlights the importance of addressing the root cause of the vulnerability (input sanitization) to prevent similar issues in the future.
  • Contact Information: Providing the Siemens contact email allows for direct engagement with the vendor for specific guidance and support.

This Markdown document provides a solid foundation for developing a comprehensive remediation and mitigation plan for CVE-2025-27494. Remember to tailor the strategy to your specific environment and risk tolerance.

Assigner

Date

  • Published Date: 2025-03-11 09:48:34
  • Updated Date: 2025-03-11 10:15:20

More Details

CVE-2025-27494