CVE-2023-44190:An Origin Validation vulnerability in MAC address validation on Juniper Networks Junos OS Evolved running on PTX10001, PTX10004, PTX10008, and PTX10016 allows a network-adjacent attacker to bypass MAC address checks, enabling forwarding of MAC addresses not intended for the adjacent LAN and potentially causing a forwarding loop and congestion in the downstream layer-2 domain.

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This CVE describes an Origin Validation flaw in MAC address validation for Junos OS Evolved on PTX10001, PTX10004, PTX10008, and PTX10016 devices. A network-adjacent attacker can bypass MAC address checking, causing the router to forward traffic for MACs not intended to reach the adjacent LAN, which may create a loop and congestion in the downstream layer-2 domain connected to the device. The issue affects multiple Junos OS Evolved releases across the PTX platforms and has been addressed in updated software releases. No specific configuration is required to exploit the issue, and there are no known workarounds. The advisory indicates fixed releases include several 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.3R2-S2-EVO, 22.3R3-S1-EVO, 22.4R2-S1-EVO, 22.4R3-EVO, 23.2R1-S1-EVO, 23.2R2-EVO, 23.3R1-EVO, and all subsequent releases.

Overview

An Origin Validation vulnerability affects Junos OS Evolved on PTX10001, PTX10004, PTX10008, and PTX10016 where MAC address validation can be bypassed, allowing a network-adjacent attacker to forward MAC addresses that should be blocked, potentially causing forwarding loops and congestion in the downstream LAN segment.

Remediation

  1. Upgrade affected devices to one of the fixed Junos OS Evolved releases listed by Juniper: 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.3R2-S2-EVO, 22.3R3-S1-EVO, 22.4R2-S1-EVO, 22.4R3-EVO, 23.2R1-S1-EVO, 23.2R2-EVO, 23.3R1-EVO, and all subsequent releases.
  2. After upgrading, verify that MAC address validation is functioning as intended and that the network no longer presents forwarding anomalies related to MAC validation.
  3. Schedule the upgrade with appropriate change control, perform the upgrade in a maintenance window, and test in a staging or lab environment if available.
  4. Monitor the downstream layer-2 domain for signs of forwarding loops or congestion and consult the Juniper advisory (JSA73154) for additional guidance and updates.
  5. Keep devices under ongoing vulnerability management by staying current with Juniper advisories and patch timelines.

References

  • Juniper Networks JSA73154 Advisory: https://supportportal.juniper.net/JSA73154
  • MITRE CVE-2023-44190: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-44190
  • NVD CVE-2023-44190: https://nvd.nist.gov/vuln/detail/CVE-2023-44190

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

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  2. Identify True Risk.
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