CVE-2025-9240

Executive Summary

CVE-2025-9240 is a publicly disclosed information disclosure vulnerability in the Elunez eladmin application, affecting versions up to and including 2.7. The flaw resides in the /auth/info endpoint, allowing an unauthenticated remote attacker to manipulate the request and retrieve sensitive information. With a CVSS score of 4.3 (Medium), the vulnerability has a low attack complexity and requires no privileges, making it easily exploitable. A public exploit has been released, increasing the risk of active exploitation. Immediate patching is recommended.

Supply Chain & Package Security

This vulnerability affects the Elunez eladmin Java-based application. While not a direct package manager (NPM, PyPI, Go, Ruby) issue, organizations using eladmin as a dependency in their Java projects should verify their version and apply the patch. The lack of a specific OSV or GitHub advisory indicates limited open-source supply chain visibility, but the public exploit warrants urgent attention.

CVSS Breakdown & Threat Level

• CVSS Score: 4.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector (AV): Network – exploitable remotely.
• Attack Complexity (AC): Low – no special conditions required.
• Privileges Required (PR): None – no authentication needed.
• User Interaction (UI): None – no user action required.
• Scope (S): Unchanged – impact confined to the vulnerable component.
• Confidentiality (C): Low – limited information disclosure.
• Integrity (I): None – no data modification.
• Availability (A): None – no denial of service.

Threat Level: Medium. The public exploit and low attack complexity increase the likelihood of widespread scanning and exploitation.

Deep Dive & Mechanics

The vulnerability exists in the /auth/info endpoint of eladmin. This endpoint is designed to return authentication-related information, but due to improper access controls or input validation, an attacker can manipulate the request (e.g., via HTTP headers or parameters) to retrieve sensitive data such as user details, session tokens, or internal configuration. The exact manipulation vector is not fully detailed, but the public exploit likely involves sending a crafted GET request to /auth/info with specific parameters or headers that bypass authorization checks.

The root cause is a missing or insufficient authorization check on the endpoint, allowing unauthenticated access to information that should be restricted. This is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor).

Vulnerable vs. Patched Code

Since no specific patch data is available, the following is a hypothetical comparison based on common fixes for such vulnerabilities.

Vulnerable Code (eladmin <= 2.7):

@GetMapping("/auth/info")
public ResponseEntity<?> getAuthInfo(HttpServletRequest request) {
    // No authentication check
    String userId = request.getParameter("userId");
    User user = userService.findById(userId);
    return ResponseEntity.ok(user);
}

Patched Code (eladmin > 2.7):

@GetMapping("/auth/info")
public ResponseEntity<?> getAuthInfo(HttpServletRequest request, @AuthenticationPrincipal UserDetails currentUser) {
    // Authentication required
    if (currentUser == null) {
        return ResponseEntity.status(HttpStatus.UNAUTHORIZED).build();
    }
    String userId = currentUser.getId();
    User user = userService.findById(userId);
    return ResponseEntity.ok(user);
}

The patched version enforces authentication and restricts the endpoint to return only the authenticated user's information.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target running eladmin <= 2.7
• Network access to the /auth/info endpoint

Exploit Steps:

1. Identify the target: http://target.com/auth/info
2. Send a crafted GET request with manipulated parameters (e.g., userId=admin):

   curl -X GET "http://target.com/auth/info?userId=admin"
   

3. If successful, the response will contain sensitive information (e.g., user details, tokens).

Public Exploit (Hypothetical based on description):

import requests

target = "http://target.com/auth/info"
params = {"userId": "admin"}
response = requests.get(target, params=params)
if response.status_code == 200:
    print("Sensitive data:", response.text)
else:
    print("Exploit failed")

Blue Team (Detection & Response)

Detection:

• Monitor for unusual requests to /auth/info with unexpected parameters.
• Look for spikes in 200 responses from this endpoint without prior authentication.

Response:

• Immediately block the endpoint if not required.
• Apply the patch or upgrade eladmin.
• Review logs for any data exfiltration.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP GET requests to /auth/info with parameters like userId, token, or session.
  • Unusual source IPs targeting the endpoint.
• File IOCs:
  • Log entries showing repeated access to /auth/info from unauthenticated sources.
• Behavioral IOCs:
  • Sudden increase in 200 responses from /auth/info without corresponding login events.

Detection Engineering

YARA Rule

rule CVE_2025_9240_InfoDisclosure {
    meta:
        description = "Detects exploitation attempts for CVE-2025-9240 in eladmin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-9240"
    strings:
        $endpoint = "/auth/info"
        $param_userId = "userId="
        $param_token = "token="
    condition:
        $endpoint and ($param_userId or $param_token)
}

Sigma Rule

title: CVE-2025-9240 - Eladmin Information Disclosure Attempt
id: 8a3f2c1e-5d7b-4a9f-8c6e-2b1d3f4a5c6d
status: experimental
description: Detects HTTP requests targeting /auth/info with suspicious parameters
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-uri-stem: "/auth/info"
        cs-uri-query|contains: 
            - "userId="
            - "token="
    condition: selection
falsepositives:
    - Legitimate admin requests
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-9240 - Eladmin Information Disclosure Attempt"; flow:to_server; content:"/auth/info"; http_uri; content:"userId="; http_uri; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Patch: Upgrade eladmin to version > 2.7. If no official patch, apply a WAF rule to block requests to /auth/info with suspicious parameters.
2. Access Control: Restrict access to /auth/info to authenticated users only via network segmentation or reverse proxy.
3. Monitor: Enable logging and alerting on /auth/info endpoint access.

Long-term Measures:

• Implement regular security audits of API endpoints.
• Use static analysis tools to detect missing authorization checks.
• Follow the principle of least privilege for all endpoints.

Valters IT Signature

Report generated by Valters IT DevSecOps Intelligence Unit