CVE-2024-44685

Executive Summary

CVE-2024-44685 exposes a critical information disclosure vulnerability in Titan SFTP and Titan MFT Server versions 2.0.25.2426 and earlier. When an authenticated administrator configures SMTP settings via the Web UI, the server returns a JSON response containing sensitive credentials (passwords) in cleartext. This flaw allows any authenticated user with access to the Web UI or network traffic interception to retrieve SMTP credentials, potentially leading to lateral movement or email account compromise. The vulnerability has a CVSS score of 0.0 (placeholder) but is assessed as HIGH severity due to the ease of exploitation and the sensitivity of exposed data.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects a proprietary enterprise application (Titan MFT/SFTP Server) and is not part of a public software supply chain.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely via HTTP requests.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): Low (L) – Requires authenticated access to the Web UI.
• User Interaction (UI): None (N) – No user action needed beyond normal configuration.
• Scope (S): Unchanged (U) – Exploit does not affect other components.
• Confidentiality (C): High (H) – Direct exposure of SMTP passwords.
• Integrity (I): None (N) – No data modification.
• Availability (A): None (N) – No denial of service.

Threat Level: HIGH (7.5) – Credential leakage can enable further attacks.

Deep Dive & Mechanics

The vulnerability resides in the SMTP configuration endpoint of the Titan Web UI. When an administrator submits SMTP settings (host, port, username, password) via the /api/smtp/settings endpoint, the server responds with a JSON object that echoes back the submitted password in plaintext. This occurs because the application does not mask or encrypt the password field in the response payload.

Root Cause: The server-side code directly includes the password field from the request into the JSON response without sanitization or redaction. This is a classic case of CWE-312 (Cleartext Storage of Sensitive Information).

Attack Scenario:

1. An attacker gains low-privileged access to the Titan Web UI (e.g., via stolen credentials or session hijacking).
2. The attacker navigates to the SMTP settings page or directly sends a crafted GET/POST request to the SMTP configuration endpoint.
3. The server returns a JSON response containing the SMTP password in cleartext.
4. The attacker uses the SMTP credentials to access the organization's email server, potentially sending phishing emails or exfiltrating data.

Vulnerable vs. Patched Code

Vulnerable Code (Titan MFT 2.0.25.2426):

# Example of vulnerable server-side handler (pseudocode)
def handle_smtp_settings(request):
    smtp_config = {
        "host": request.get("host"),
        "port": request.get("port"),
        "username": request.get("username"),
        "password": request.get("password")  # Directly included
    }
    return json_response(smtp_config)

Patched Code (Hypothetical fix):

def handle_smtp_settings(request):
    smtp_config = {
        "host": request.get("host"),
        "port": request.get("port"),
        "username": request.get("username"),
        "password": "********"  # Masked
    }
    return json_response(smtp_config)

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Access to Titan Web UI with valid credentials (any role).
• Network access to the Titan server (port 443 or custom port).

Exploitation Steps:

1. Log in to the Titan Web UI.
2. Navigate to Settings > SMTP Configuration.
3. Intercept the HTTP request/response using a proxy (e.g., Burp Suite).
4. Observe the JSON response containing the SMTP password in cleartext.

Manual Exploit (cURL):

# Authenticate first (replace with actual credentials)
curl -k -X POST https://titan-server/api/auth/login \
  -H "Content-Type: application/json" \
  -d '{"username":"admin","password":"admin123"}' \
  -c cookies.txt

# Retrieve SMTP settings (password exposed)
curl -k -X GET https://titan-server/api/smtp/settings \
  -H "Content-Type: application/json" \
  -b cookies.txt

Expected Response:

{
  "host": "smtp.example.com",
  "port": 587,
  "username": "smtp_user",
  "password": "SuperSecretP@ssw0rd"
}

Blue Team (Detection & Hardening)

Detection:

• Monitor HTTP responses for JSON payloads containing "password" fields with non-masked values.
• Alert on any access to /api/smtp/settings by non-admin users.

Hardening:

• Restrict access to the Web UI to trusted IPs only.
• Implement network segmentation to isolate the Titan server.
• Use a WAF to block requests to sensitive API endpoints from untrusted sources.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /api/smtp/settings with a valid session cookie.
  • JSON responses containing "password" with a cleartext value.
• File IOCs:
  • Log entries showing access to SMTP configuration by unexpected users.
• Behavioral IOCs:
  • Unusual SMTP authentication attempts from external IPs after credential exposure.

Detection Engineering

YARA Rule

rule CVE_2024_44685_Titan_SMTP_Cleartext {
    meta:
        description = "Detects cleartext SMTP password exposure in Titan MFT/SFTP responses"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2024-44685"
    strings:
        $json_pattern = /"password"\s*:\s*"[^"]{8,}"/
    condition:
        $json_pattern
}

Sigma Rule

title: Titan MFT SMTP Password Exposure
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects HTTP responses containing cleartext SMTP passwords from Titan MFT/SFTP
author: Valters IT
logsource:
    category: webserver
    product: generic
detection:
    selection:
        response.body|contains: '"password"'
        response.status_code: 200
        request.url|contains: '/api/smtp/settings'
    condition: selection
falsepositives:
    - Legitimate admin configuration (should be rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-44685 Titan SMTP Password Exposure"; flow:to_server,established; content:"/api/smtp/settings"; http_uri; content:"password"; http_server_body; pcre:"/\"password\"\s*:\s*\"[^\"]{8,}\"/"; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade to a patched version of Titan MFT/SFTP (if available) or contact the vendor for a hotfix.
2. Restrict Web UI access to authorized IPs only via firewall rules.
3. Rotate SMTP credentials immediately if any exposure is suspected.

Long-term Mitigations:

• Implement a WAF to mask sensitive fields in API responses.
• Enforce HTTPS with strong ciphers to prevent network sniffing.
• Conduct regular security audits of web application responses.

Workaround:

• Disable SMTP configuration via Web UI and use a separate, secure configuration tool.

Valters IT