CVE-2024-48227

Executive Summary

CVE-2024-48227 identifies a logical flaw in Funadmin version 5.0.2, specifically within the "Curd one click command deletion" function. This flaw allows an unauthenticated attacker to trigger a Denial of Service (DoS) condition, rendering the application unavailable. The vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling), as the flawed logic likely leads to resource exhaustion. No public exploit code or patch is currently available, making this a high-priority issue for organizations using Funadmin.

Supply Chain & Package Security

This vulnerability affects the Funadmin web application, which is a PHP-based framework. While not a direct package manager dependency (NPM, PyPI, Go, Ruby), the risk extends to any deployment where Funadmin is used. Organizations should audit their supply chain for any dependencies that rely on Funadmin components.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
• Base Score: 7.5 (High)
• 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: None (C:N) – No data exposure.
• Integrity Impact: None (I:N) – No data modification.
• Availability Impact: High (A:H) – Complete denial of service.

Threat Level: High. The low attack complexity and lack of required privileges make this a serious threat for unpatched instances.

Deep Dive & Mechanics

The vulnerability resides in the "Curd one click command deletion" function, a feature designed to streamline database operations. The logical flaw likely involves improper validation or throttling of deletion requests. An attacker can send a crafted request that triggers an infinite loop, excessive memory allocation, or database lock, leading to resource exhaustion and service unavailability.

Root Cause Analysis:

• The function may not limit the number of records deleted in a single operation.
• Lack of input validation on parameters controlling deletion scope.
• No rate limiting or concurrency controls, allowing rapid repeated requests.

Attack Vector: An unauthenticated attacker sends a specially crafted HTTP request to the vulnerable endpoint (e.g., /curd/delete). The request contains parameters that cause the function to attempt deletion of an unbounded set of records, consuming server resources (CPU, memory, database connections) until the service crashes or becomes unresponsive.

Vulnerable vs. Patched Code

Since no official patch is available, the following is a hypothetical comparison based on the vulnerability description.

Vulnerable Code (Funadmin 5.0.2):

// Vulnerable: No limit on deletion scope
public function deleteAll($ids) {
    $this->db->whereIn('id', $ids)->delete();
}

Patched Code (Hypothetical Fix):

// Patched: Limit deletion to a reasonable batch size
public function deleteAll($ids) {
    $batchSize = 100;
    $chunks = array_chunk($ids, $batchSize);
    foreach ($chunks as $chunk) {
        $this->db->whereIn('id', $chunk)->delete();
    }
}

The fix introduces batch processing and input validation to prevent resource exhaustion.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A running instance of Funadmin 5.0.2.
• Network access to the vulnerable endpoint.

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., /curd/delete).
2. Craft a POST request with a large number of IDs or a wildcard parameter.
3. Send the request repeatedly to amplify the DoS effect.

Example Request (using cURL):

curl -X POST http://target.com/curd/delete \
  -H "Content-Type: application/json" \
  -d '{"ids": ["1","2","3", ... (thousands of IDs)]}'

Expected Outcome: The server becomes unresponsive due to resource exhaustion.

Blue Team (Defense & Detection)

Detection:

• Monitor for unusually high numbers of DELETE requests to /curd/delete.
• Alert on response times exceeding thresholds (e.g., >10 seconds).
• Use WAF rules to block requests with excessively large payloads.

Mitigation:

• Apply input validation to limit the number of IDs per request.
• Implement rate limiting on the vulnerable endpoint.
• Deploy a Web Application Firewall (WAF) to filter malicious patterns.

Indicators of Compromise (IOCs)

• Network IOCs:

  • High volume of POST requests to /curd/delete from a single IP.
  • Requests with JSON payloads containing arrays of thousands of IDs.
  • Unusual HTTP 500 errors or timeouts from the Funadmin application.

• System IOCs:

  • High CPU and memory usage on the web server.
  • Database connection pool exhaustion.
  • Application logs showing repeated deletion attempts with large datasets.

Detection Engineering

YARA Rule

rule Detect_Funadmin_DoS_Attempt {
    meta:
        description = "Detects potential DoS attempts against Funadmin CVE-2024-48227"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-48227"
    strings:
        $s1 = "/curd/delete" ascii wide nocase
        $s2 = "ids" ascii wide nocase
        $json_array = /\[[0-9,\s]{100,}\]/  // Large array of IDs
    condition:
        $s1 and $s2 and #json_array > 0
}

Sigma Rule

title: Funadmin DoS Attempt via Curd Delete
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects attempts to exploit CVE-2024-48227 by sending large deletion requests
author: Valters IT
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/curd/delete'
        cs-uri-query|contains: 'ids'
    condition: selection
falsepositives:
    - Legitimate bulk deletion operations (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"Funadmin DoS Attempt - CVE-2024-48227"; flow:to_server,established; content:"POST"; http_method; content:"/curd/delete"; http_uri; content:"ids"; http_client_body; pcre:"/\[[0-9,\s]{100,}\]/"; classtype:attempted-dos; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable function if not essential, by removing or commenting out the deleteAll method in the Funadmin codebase.
2. Apply input validation to limit the number of IDs accepted in a single request (e.g., max 100).
3. Implement rate limiting on the /curd/delete endpoint to prevent rapid repeated requests.

Long-Term Fix:

• Monitor the Funadmin project for an official patch.
• Consider migrating to a more actively maintained framework if no patch is released.
• Conduct a security audit of all custom CRUD functions.

Workaround:

• Use a Web Application Firewall (WAF) to block requests with excessively large payloads or suspicious patterns.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert