CVE-2025-7386

Executive Summary

CVE-2025-7386 is an information exposure vulnerability in Hitachi Storage Navigator, affecting multiple Hitachi Virtual Storage Platform (VSP) models. The flaw allows an unauthenticated attacker to access sensitive information, such as system configuration details, through the Storage Navigator web interface. With a CVSS score of 6.8 (Medium), the vulnerability is exploitable over the network without authentication, posing a risk of data leakage. No public proof-of-concept (PoC) or exploit code is available at this time, but the vendor has released firmware updates to address the issue. This report provides a comprehensive analysis, detection methods, and remediation steps.

Supply Chain & Package Security

This vulnerability is not related to open-source packages (NPM, PyPI, Go, Ruby) but affects proprietary Hitachi storage firmware. Organizations using Hitachi VSP systems should treat this as a critical supply chain risk, as the vulnerable component is embedded in the storage platform's management software.

CVSS Breakdown & Threat Level

• CVSS Score: 6.8 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Network (AV:N) – exploitable remotely.
• Attack Complexity: Low (AC:L) – no special conditions required.
• Privileges Required: None (PR:N) – no authentication needed.
• User Interaction: None (UI:N) – no user action required.
• Scope: Unchanged (S:U) – impact confined to the vulnerable component.
• Confidentiality Impact: Low (C:L) – limited information disclosure.
• Integrity Impact: None (I:N) – no data modification.
• Availability Impact: None (A:N) – no denial of service.

Threat Level: Medium. The vulnerability is easy to exploit but only leads to information exposure, not system compromise. However, leaked data (e.g., network topology, firmware versions) could aid further attacks.

Deep Dive & Mechanics

The vulnerability resides in Hitachi Storage Navigator, the web-based management interface for Hitachi VSP systems. Storage Navigator exposes RESTful APIs and web endpoints for configuration and monitoring. Due to improper access controls, certain endpoints return sensitive information without authentication.

Root Cause: The SVP (Service Processor) component and DKCMAIN firmware fail to enforce authentication for specific API calls. An attacker can send crafted HTTP requests to the Storage Navigator interface (typically on TCP port 2001 or 443) to retrieve system information such as:

• Storage system serial numbers
• Firmware versions
• Network configuration (IP addresses, VLANs)
• Logical unit (LU) mappings
• User account names (but not passwords)

Attack Flow:

1. Scan for exposed Hitachi Storage Navigator interfaces (e.g., using Shodan dork port:2001 Hitachi).
2. Send a GET request to a vulnerable endpoint, e.g., /svp/api/v1/system/info.
3. Receive JSON response containing sensitive data.
4. Use leaked information for targeted attacks (e.g., firmware version to find other CVEs).

Affected Components:

• DKCMAIN: Disk Controller Main firmware – handles storage operations.
• SVP: Service Processor – management interface.

Vulnerable vs. Patched Code

No source code is available, but the patch involves adding authentication checks to the vulnerable endpoints.

Vulnerable Behavior (pre-patch):

• Endpoint /svp/api/v1/system/info returns data without authentication.
• Example response (simulated):

{
  "serial": "VSP-12345",
  "firmware": "DKCMAIN 90-08-86-00/00",
  "ip_address": "192.168.1.100",
  "vlan": "100"
}

Patched Behavior (post-patch):

• Same endpoint requires a valid session token or API key.
• Example response when unauthenticated:

{
  "error": "Unauthorized",
  "message": "Authentication required"
}

Patch Details:

• For VSP 5100/5200/5500/5600/H series and VX8: Upgrade DKCMAIN to Ver. 90-09-24-00/00 and SVP to Ver. 90-09-24/00.
• For VSP G1000/G1500/F1500 and VX7: Upgrade DKCMAIN to Ver. 80-06-96-00/00 and SVP to Ver. 80-06-91/00.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target running vulnerable Hitachi VSP firmware.
• Network access to the Storage Navigator interface (port 2001 or 443).

Exploitation Steps:

1. Reconnaissance: Use Shodan or masscan to find exposed interfaces.

   masscan 0.0.0.0/0 -p2001 --rate=1000 -oJ hitachi.json
   

2. Information Gathering: Send unauthenticated request to vulnerable endpoint.

   curl -k https://<target>:2001/svp/api/v1/system/info
   

3. Data Extraction: Parse JSON output for sensitive fields.

   curl -s https://<target>:2001/svp/api/v1/system/info | jq '.serial, .firmware'
   

Lab Setup:

• Use a virtualized Hitachi VSP simulator (if available) or a real device in an isolated network.
• Ensure the firmware version is vulnerable (e.g., DKCMAIN 90-08-86-00/00).

Blue Team (Defense)

Detection:

• Monitor for unauthenticated requests to /svp/api/v1/system/info or similar endpoints.
• Alert on multiple failed authentication attempts (if patched) or successful data retrieval from unauthenticated sources.

Hunting:

• Search logs for HTTP 200 responses from Storage Navigator without prior authentication.
• Look for IP addresses scanning port 2001 across the network.

Mitigation:

• Apply vendor patches immediately.
• Restrict network access to Storage Navigator using firewalls or ACLs.
• Enable logging and monitoring on the SVP.

Indicators of Compromise (IOCs)

Network IOCs:

• Source IPs scanning port 2001 (TCP) for Hitachi Storage Navigator.
• HTTP requests to /svp/api/v1/system/info without a session cookie.
• Unusual outbound data transfers from storage management network.

File/System IOCs:

• Log entries in SVP logs showing GET /svp/api/v1/system/info from unknown IPs.
• Presence of curl or wget commands in SVP shell history (if attacker gains access).

YARA Rule (for log files):

rule Hitachi_InfoExposure_Logs {
    meta:
        description = "Detects log entries indicating exploitation of CVE-2025-7386"
        author = "Valters IT"
        date = "2025-04-10"
    strings:
        $s1 = "/svp/api/v1/system/info" ascii wide
        $s2 = "200" ascii wide
    condition:
        $s1 and $s2
}

Detection Engineering

YARA Rule (for network traffic captures)

rule Hitachi_CVE_2025_7386_Network {
    meta:
        description = "Detects unauthenticated requests to Hitachi Storage Navigator info endpoint"
        author = "Valters IT"
        date = "2025-04-10"
    strings:
        $uri = "/svp/api/v1/system/info" ascii wide
        $method = "GET" ascii wide
    condition:
        $uri and $method
}

Sigma Rule (for Windows Event Logs or Sysmon)

title: Hitachi Storage Navigator Information Exposure
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects unauthenticated access to sensitive Hitachi Storage Navigator endpoint
author: Valters IT
date: 2025/04/10
logsource:
    category: webserver
    product: hitachi_storage_navigator
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem: '/svp/api/v1/system/info'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate administrative access after authentication (if patched)
level: high

Suricata Rule (for network IDS)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-7386 - Hitachi Storage Navigator Information Exposure Attempt";
    flow:to_server,established;
    content:"GET"; http_method;
    content:"/svp/api/v1/system/info"; http_uri;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Patch: Upgrade DKCMAIN and SVP firmware to the versions specified in the patch details.
2. Network Segmentation: Isolate the Storage Navigator interface on a management VLAN with strict firewall rules.
3. Access Control: Implement IP whitelisting for the Storage Navigator web interface.

Long-Term Measures:

• Enable multi-factor authentication (MFA) for all storage management access.
• Regularly audit firmware versions and apply updates.
• Deploy a web application firewall (WAF) to block unauthenticated requests to sensitive endpoints.

Workaround (if patching is delayed):

• Disable the Storage Navigator web interface if not required, and use CLI-only management.
• Use a reverse proxy to add authentication before requests reach the SVP.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert