CVE-2024-28020 Hitachi Energy CVE debrief

Who should care

Organizations running Hitachi Energy UNEM, especially administrators of affected R15A, R16A, R15B, R16B, and older-than-R15A deployments. Identity, server, and OT/ICS operations teams should care because the issue concerns account and credential reuse in application and server management.

Technical summary

The advisory describes a user/password reuse vulnerability in UNEM application and server management. If an attacker obtains valid login information, they may be able to extend access beyond the intended account boundary and reach the server and other services. The supplied CVSS vector is CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H, indicating a network-reachable issue with high impact if exploited under the stated privilege conditions.

Defensive priority

High. The vulnerability affects multiple product branches, including versions with no fix planned because they are end-of-life, and the stated impact includes broad confidentiality, integrity, and availability exposure.

Recommended defensive actions

• Update to UNEM R16B PC4 or R15B PC5 when available, as recommended by the advisory.
• For affected R16B and R15B deployments, deny nemadm SSH logins by configuring DenyUsers in /etc/ssh/sshd_config, if that account is present in your environment.
• For end-of-life versions, plan migration because no remediation will be available for those branches.
• Review UNEM and related server accounts for credential reuse and rotate passwords where reuse is detected.
• Restrict administrative access to UNEM and associated services to the minimum necessary users and hosts.
• Apply general ICS defense-in-depth and monitoring practices to detect unauthorized logins or privilege expansion.

Evidence notes

The source corpus identifies Hitachi Energy as the vendor and UNEM as the product family. Affected products listed in the CSAF content are UNEM R16B, R15B, R16A, R15A, and older than R15A. The remediation section states that EOL versions have no fix planned and recommends updating to UNEM R16B PC4 or R15B PC5, plus general mitigation factors. For R16B and R15B, the advisory specifically lists denying nemadm SSH logins via DenyUsers in /etc/ssh/sshd_config. The CVE and source timeline fields supplied here place publication on 2024-06-11T12:30:00Z.

Official resources