CVE-2025-39247

Executive Summary

CVE-2025-39247 is a critical access control vulnerability in HikCentral Professional, a video management and security platform. The flaw allows an unauthenticated attacker to escalate privileges to admin level, potentially leading to full system compromise. With a CVSS score of 8.6, the vulnerability is remotely exploitable without authentication, posing a severe risk to organizations using affected versions. No public proof-of-concept (PoC) or patch details are currently available, but the high impact warrants immediate attention.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects a proprietary enterprise software product (HikCentral Professional). Supply chain risks may arise if the software is distributed through third-party channels or if compromised admin access is used to tamper with updates.

CVSS Breakdown & Threat Level

• CVSS Score: 8.6 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: High
• Integrity Impact: High
• Availability Impact: High

Threat Level: Critical. The vulnerability allows unauthenticated remote attackers to gain full admin control, enabling data theft, system manipulation, and potential lateral movement.

Deep Dive & Mechanics

The vulnerability resides in the access control mechanism of HikCentral Professional. The software fails to properly validate user permissions when processing certain API requests or administrative functions. An unauthenticated attacker can craft a specially crafted HTTP request that bypasses authentication checks, directly granting admin-level privileges.

Root Cause: Improper enforcement of access control lists (ACLs) or missing authentication checks in critical endpoints. The software likely trusts client-supplied session tokens or user roles without verifying their authenticity.

Attack Vector: Remote, unauthenticated HTTP requests to vulnerable endpoints (e.g., /api/admin, /user/privilege).

Impact: Full admin access allows the attacker to:

• View and modify all camera feeds and recordings.
• Add/delete users and change permissions.
• Exfiltrate sensitive video data.
• Disable security monitoring.
• Use the compromised system as a pivot point for further network attacks.

Vulnerable vs. Patched Code

Since no patch is available, a hypothetical comparison is provided:

Vulnerable Code (Conceptual):

@app.route('/api/admin')
def admin_panel():
    # Missing authentication check
    return render_admin_panel()

Patched Code (Conceptual):

@app.route('/api/admin')
@require_admin_auth
def admin_panel():
    return render_admin_panel()

The patched version would enforce authentication and authorization before granting access to admin functions.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target running HikCentral Professional (any version).
• Network access to the HikCentral web interface (default port 80/443).

Exploitation Steps:

1. Identify the target's IP and port.
2. Send a crafted HTTP request to a vulnerable endpoint (e.g., /api/admin or /user/privilege).
3. The server responds with admin-level access without requiring credentials.

Example Request (Conceptual):

POST /api/admin HTTP/1.1
Host: target.com
Content-Type: application/json

{"action": "get_all_users"}

Note: No public exploit code is available. This is a conceptual demonstration.

Blue Team (Detection & Defense)

Detection:

• Monitor for unusual HTTP requests to admin endpoints without prior authentication.
• Look for spikes in failed login attempts followed by successful admin actions.
• Use the detection rules below.

Defense:

• Isolate HikCentral systems from the internet if possible.
• Apply strict network segmentation.
• Monitor for unauthorized admin account creation.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /api/admin, /user/privilege, or similar endpoints from unknown IPs.
  • Unusual POST requests with JSON payloads to administrative paths.
• System IOCs:
  • New admin user accounts created without proper authorization.
  • Changes to user permissions or roles.
  • Unusual access to video feeds or recordings.
• Log IOCs:
  • Log entries showing successful admin actions without prior authentication.
  • Missing or cleared audit logs.

Detection Engineering

YARA Rule

rule CVE_2025_39247_HikCentral_Admin_Bypass {
    meta:
        description = "Detects potential exploitation of CVE-2025-39247 in HikCentral Professional"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-39247"
    strings:
        $s1 = "/api/admin" ascii wide nocase
        $s2 = "/user/privilege" ascii wide nocase
        $s3 = "admin" ascii wide nocase
        $s4 = "privilege" ascii wide nocase
    condition:
        any of ($s1, $s2) and any of ($s3, $s4)
}

Sigma Rule

title: CVE-2025-39247 HikCentral Admin Bypass
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects HTTP requests targeting HikCentral admin endpoints without authentication
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem:
            - '/api/admin'
            - '/user/privilege'
    condition: selection
falsepositives:
    - Legitimate admin actions from authorized users
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-39247 HikCentral Admin Bypass Attempt"; flow:to_server; content:"POST"; http_method; content:"/api/admin"; http_uri; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate HikCentral systems from the internet and untrusted networks.
2. Monitor logs for suspicious admin activity.
3. Apply vendor patches as soon as they become available.
4. Restrict access to HikCentral web interfaces using firewall rules or VPNs.

Long-term Fixes:

• Implement proper authentication and authorization checks on all admin endpoints.
• Use multi-factor authentication (MFA) for admin access.
• Regularly audit user permissions and logs.

Workaround:

• If patching is not possible, disable remote access to the HikCentral web interface and use local access only.

Valters IT