CVE-2021-40905:CheckMK Enterprise Edition (1.5.0-2.0.0p9) allows authenticated remote code execution via unsanitized .mkp file uploads.

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Description Preview

The web management console of CheckMK Enterprise Edition (versions 1.5.0 to 2.0.0p9) contains a vulnerability that allows remote code execution through unsanitized .mkp extension package uploads. Successful exploitation requires either valid administrator credentials or a hijacked session of a user with administrator privileges. The vendor has noted that this behavior is actually intentional by design, as administrators are expected to have the ability to execute code through this mechanism.

Overview

This vulnerability (CVE-2021-40905) is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The issue affects the web management console of CheckMK Enterprise Edition across versions 1.5.0 through 2.0.0p9. The vulnerability allows an authenticated user with administrative privileges to upload malicious .mkp extension packages that can lead to remote code execution on the server. While this requires administrative access, it could be exploited if an attacker obtains valid administrator credentials or hijacks an administrator's session. The vendor has indicated that this behavior is by design, as administrators are intended to have the capability to execute code on the system.

Remediation

Since the vendor has stated that this is intended functionality for administrators, traditional remediation approaches may not apply. However, organizations should implement the following security measures:

  1. Enforce strong authentication for administrative accounts
  2. Implement multi-factor authentication for administrator access
  3. Regularly audit administrator activities and .mkp file uploads
  4. Monitor system logs for suspicious activities
  5. Ensure administrative access is granted only to trusted individuals
  6. Consider network segmentation to limit access to the management console
  7. If possible, upgrade to the latest version of CheckMK Enterprise Edition beyond 2.0.0p9

References

  1. CheckMK Product Website: http://checkmk.com
  2. Exploit Details and Advisory: https://github.com/Edgarloyola/CVE-2021-40905

Industry ExposureMost to least
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.

  1. Accommodation & Food Services
    Accommodation & Food Services
  2. Administrative, Support, Waste Management & Remediation Services
    Administrative, Support, Waste Management & Remediation Services
  3. Agriculture, Forestry Fishing & Hunting
    Agriculture, Forestry Fishing & Hunting
  4. Arts, Entertainment & Recreation
    Arts, Entertainment & Recreation
  5. Construction
    Construction
  6. Educational Services
    Educational Services
  7. Finance and Insurance
    Finance and Insurance
  8. Health Care & Social Assistance
    Health Care & Social Assistance
  9. Information
    Information
  10. Management of Companies & Enterprises
    Management of Companies & Enterprises
  11. Manufacturing
    Manufacturing
  12. Mining
    Mining
  13. Other Services (except Public Administration)
    Other Services (except Public Administration)
  14. Professional, Scientific, & Technical Services
    Professional, Scientific, & Technical Services
  15. Public Administration
    Public Administration
  16. Real Estate Rental & Leasing
    Real Estate Rental & Leasing
  17. Retail Trade
    Retail Trade
  18. Transportation & Warehousing
    Transportation & Warehousing
  19. Utilities
    Utilities
  20. Wholesale Trade
    Wholesale Trade

Focus on What Matters

  1. See Everything.
  2. Identify True Risk.
  3. Proactively Mitigate Threats.

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