CVE-2024-26309

Executive Summary

CVE-2024-26309 is a sensitive information disclosure vulnerability in Archer Platform versions 6.x prior to 6.14 P2 HF2 (6.14.0.2.2). An unauthenticated attacker can exploit this flaw by accessing a specific internal URL, potentially exposing sensitive data such as configuration details, internal network information, or user credentials. The vulnerability has a CVSS score of 5.3 (Medium) and an EPSS score of 0.0%, indicating low exploitation likelihood. No public proof-of-concept (PoC) or exploit code is available at this time. The vendor has released a patch in version 6.14 P2 HF2.

CVSS Breakdown & Threat Level

• CVSS Score: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: Low (C:L)
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)
• Threat Level: Medium. The vulnerability allows unauthenticated access to sensitive information, but the impact is limited to confidentiality.

Deep Dive & Mechanics

The vulnerability resides in the Archer Platform's web interface, specifically in how it handles internal URLs. An unauthenticated attacker can craft a request to a specific internal URL that the application does not properly restrict. This URL may expose configuration files, debug logs, or other sensitive data that should only be accessible to authenticated users or internal systems.

The root cause is a lack of proper access control checks on certain endpoints. The application fails to validate the user's authentication status before serving sensitive content. This is a classic example of CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor).

The attack is straightforward: the attacker sends a GET request to the vulnerable URL. The server responds with the sensitive data in the HTTP response body. No authentication or special privileges are required.

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

# Example of vulnerable endpoint in Archer Platform
@app.route('/internal/config')
def get_config():
    # No authentication check
    return json.dumps(config_data)

Patched Code (Conceptual):

# Example of patched endpoint in Archer Platform
@app.route('/internal/config')
@login_required  # Authentication decorator added
def get_config():
    return json.dumps(config_data)

The patch adds authentication checks to the vulnerable endpoints, ensuring that only authenticated users can access sensitive information.

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Deploy a vulnerable Archer Platform instance (version 6.x before 6.14 P2 HF2).
2. Ensure the instance is accessible over the network.

Exploitation Steps:

1. Identify the vulnerable internal URL. Based on the CVE description, it is likely an endpoint like /internal/config or /debug.
2. Send an unauthenticated GET request to the URL:

   curl -X GET http://target-archer-instance/internal/config
   

3. The response will contain sensitive information (e.g., database credentials, API keys, internal IPs).

Expected Output:

{
  "database": {
    "host": "192.168.1.100",
    "port": 3306,
    "user": "archer_admin",
    "password": "s3cr3t!"
  },
  "api_keys": ["key1", "key2"]
}

Blue Team

Detection Steps:

1. Monitor for unusual access to internal URLs (e.g., /internal/*, /debug/*).
2. Look for unauthenticated requests to these endpoints.
3. Check logs for 200 responses to these URLs from unknown IPs.

Mitigation Steps:

1. Immediately apply the patch by upgrading to Archer Platform 6.14 P2 HF2.
2. If patching is not possible, implement a Web Application Firewall (WAF) rule to block access to internal URLs.
3. Restrict network access to the Archer Platform to trusted IPs only.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP GET requests to /internal/config, /debug, or similar internal endpoints.
  • Source IPs not in the trusted list accessing these URLs.
• File IOCs:
  • Unauthorized access to configuration files or debug logs.
• Behavioral IOCs:
  • Unusual data exfiltration from the Archer Platform.

Detection Engineering

YARA Rule

rule CVE_2024_26309_Archer_Info_Disclosure {
    meta:
        description = "Detects sensitive information disclosure in Archer Platform"
        author = "Valters IT"
        date = "2024-01-01"
        reference = "CVE-2024-26309"
    strings:
        $s1 = "database" ascii
        $s2 = "password" ascii
        $s3 = "api_keys" ascii
        $s4 = "internal" ascii
    condition:
        any of ($s*) and filesize < 1MB
}

Sigma Rule

title: CVE-2024-26309 - Archer Platform Sensitive Information Disclosure
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects unauthenticated access to internal URLs in Archer Platform
author: Valters IT
date: 2024/01/01
logsource:
    category: webserver
    product: archer
detection:
    selection:
        cs-uri-stem:
            - '/internal/*'
            - '/debug/*'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate internal monitoring tools
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-26309 - Archer Platform Sensitive Information Disclosure"; flow:to_server; content:"GET"; http_method; content:"/internal/"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Upgrade to Archer Platform 6.14 P2 HF2 (6.14.0.2.2) or later.
2. Workaround: If patching is not possible, implement a WAF rule to block access to /internal/* and /debug/* endpoints.
3. Network Segmentation: Restrict access to the Archer Platform to trusted IPs only.
4. Monitoring: Enable logging and monitoring for unusual access patterns to internal URLs.
5. Incident Response: If exploitation is suspected, rotate all credentials and API keys exposed through the vulnerability.

Valters IT