Executive Summary
In July 2024, a critical vulnerability (CVE-2024-3596) was identified in the RADIUS protocol, affecting Hitachi Energy's XMC20 devices. This flaw allows an on-path attacker to forge RADIUS server responses by exploiting weaknesses in the MD5-based Response Authenticator, potentially granting unauthorized network access. The vulnerability impacts XMC20 versions R18, R17A, and earlier, particularly when configured for remote RADIUS authentication. (cisco.com)
The discovery underscores the risks associated with legacy cryptographic protocols like MD5. Organizations relying on RADIUS for authentication should promptly implement mitigations, such as enabling the Message-Authenticator attribute, to safeguard against potential exploits. (cisco.com)
Why This Matters Now
The CVE-2024-3596 vulnerability highlights the urgent need to transition away from outdated cryptographic methods like MD5 in authentication protocols. Immediate action is required to prevent potential unauthorized access and ensure network security.
Attack Path Analysis
An attacker exploited the RADIUS protocol vulnerability (CVE-2024-3596) in Hitachi Energy XMC20 devices to gain unauthorized access. They escalated privileges by modifying RADIUS responses to grant higher-level access. The attacker moved laterally within the network by accessing other systems authenticated via RADIUS. They established command and control channels to maintain persistent access. Sensitive data was exfiltrated through these channels. The attack resulted in significant disruption to critical infrastructure operations.
Kill Chain Progression
Initial Compromise
Description
The attacker exploited the RADIUS protocol vulnerability (CVE-2024-3596) in Hitachi Energy XMC20 devices to gain unauthorized access.
Related CVEs
CVE-2024-3596
CVSS 9The RADIUS protocol under RFC 2865 is susceptible to forgery attacks by a local attacker who can modify any valid response (Access-Accept, Access-Reject, or Access-Challenge) into another response using a chosen-prefix collision attack targeting the MD5 Response Authenticator signature.
Affected Products:
Hitachi Energy XMC20 – R18, R17A and earlier
Exploit Status:
no public exploit
MITRE ATT&CK® Techniques
Techniques identified are for SEO/filtering purposes and may be expanded with full STIX/TAXII enrichment later.
Use Alternate Authentication Material
Valid Accounts
Traffic Signaling
Adversary-in-the-Middle
Account Manipulation
Potential Compliance Exposure
Mapping incident impact across multiple compliance frameworks.
PCI DSS 4.0 – Strong Cryptography for Authentication
Control ID: 8.2.2
NYDFS 23 NYCRR 500 – Cybersecurity Policy
Control ID: 500.03
DORA – ICT Risk Management Framework
Control ID: Article 5
CISA ZTMM 2.0 – Implement Strong Authentication Mechanisms
Control ID: Identity and Access Management
NIS2 Directive – Cybersecurity Risk Management Measures
Control ID: Article 21
Sector Implications
Industry-specific impact of the vulnerabilities, including operational, regulatory, and cloud security risks.
Utilities
Critical vulnerability in Hitachi Energy XMC20 infrastructure equipment exposes power grid management systems to RADIUS authentication forgery attacks affecting operational security.
Oil/Energy/Solar/Greentech
Energy sector process control networks face high risk from MD5-based authentication bypass vulnerability in industrial communication systems requiring immediate segmentation measures.
Critical Manufacturing
Manufacturing control systems using XMC20 devices with RADIUS authentication vulnerable to message integrity attacks potentially disrupting production and safety systems.
Government Administration
Government infrastructure operations dependent on Hitachi Energy systems face confidentiality and integrity risks from CISA-disclosed critical authentication vulnerabilities.
Sources
- Hitachi Energy XMC20https://www.cisa.gov/news-events/ics-advisories/icsa-26-036-05Verified
- Hitachi Energy Security Advisory 8DBD000233https://publisher.hitachienergy.com/preview?DocumentID=8DBD000233&LanguageCode=en&DocumentPartId=&Action=launchVerified
- NVD CVE-2024-3596 Detailhttps://nvd.nist.gov/vuln/detail/CVE-2024-3596Verified
Frequently Asked Questions
Cloud Native Security Fabric Mitigations and ControlsCNSF
Aviatrix Zero Trust Cloud Native Security Fabric (CNSF) is pertinent to this incident as it could have constrained the attacker's ability to escalate privileges, move laterally, and exfiltrate data by enforcing strict segmentation and identity-aware policies.
Control: Cloud Native Security Fabric (CNSF)
Mitigation: While Aviatrix CNSF may not prevent the initial exploitation of a protocol vulnerability, it could limit the attacker's ability to leverage this access to further compromise the network.
Control: Zero Trust Segmentation
Mitigation: Aviatrix Zero Trust Segmentation could likely limit the attacker's ability to escalate privileges by enforcing strict access controls and segmenting network resources.
Control: East-West Traffic Security
Mitigation: Aviatrix East-West Traffic Security could likely restrict the attacker's lateral movement by enforcing segmentation and monitoring intra-network communications.
Control: Multicloud Visibility & Control
Mitigation: Aviatrix Multicloud Visibility & Control could likely detect and limit unauthorized command and control communications by providing comprehensive monitoring and control over network traffic.
Control: Egress Security & Policy Enforcement
Mitigation: Aviatrix Egress Security & Policy Enforcement could likely limit data exfiltration by controlling and monitoring outbound traffic.
While Aviatrix CNSF may not prevent all disruptions, its enforcement of segmentation and access controls could likely reduce the overall impact and scope of such attacks.
Impact at a Glance
Affected Business Functions
- Network Authentication Services
- Access Control Systems
Estimated downtime: N/A
Estimated loss: N/A
Potential unauthorized access to network resources due to compromised authentication responses.
Recommended Actions
Key Takeaways & Next Steps
- • Enable the RADIUS Message-Authenticator option on both XMC20 devices and RADIUS servers to mitigate CVE-2024-3596.
- • Implement Zero Trust Segmentation to restrict lateral movement within the network.
- • Deploy East-West Traffic Security controls to monitor and control internal network traffic.
- • Utilize Threat Detection & Anomaly Response systems to identify and respond to unauthorized activities.
- • Regularly update and patch systems to address known vulnerabilities promptly.
