CVE-2025-58079

Executive Summary

CVE-2025-58079 is a medium-severity vulnerability (CVSS 4.3) affecting desknet's NEO AppSuite versions V4.0R1.0 through V9.0R2.0. The flaw is classified as CWE-424: Improper Protection of Alternate Path, which allows an attacker to create malicious AppSuite applications. This vulnerability enables an unauthenticated attacker to bypass intended access controls by exploiting an unprotected alternate path within the application's architecture. The EPSS score is 0.0%, indicating low current exploitation activity, but the lack of a patch makes this a significant risk for organizations using the affected software.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
• Base Score: 4.3 (Medium)
• 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: Low (I:L) – Attacker can create malicious applications.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Medium. The vulnerability allows creation of malicious AppSuite applications, which could lead to further compromise if those applications are executed by users.

Deep Dive & Mechanics

The vulnerability resides in the AppSuite component of desknet's NEO, a web-based groupware platform. CWE-424 (Improper Protection of Alternate Path) occurs when the application fails to properly protect alternate paths or channels that can be used to bypass security controls. In this case, the AppSuite likely exposes an API or endpoint that allows application creation without proper authentication or authorization checks.

Attack Scenario:

1. An attacker identifies the unprotected endpoint (e.g., /appsuite/api/create).
2. The attacker sends a crafted HTTP request to create a malicious AppSuite application.
3. The application is created and stored on the server.
4. If the application is executed by a user (e.g., via social engineering), it could perform actions within the user's context, such as data exfiltration or privilege escalation.

Root Cause: The application does not validate the origin or authenticity of requests to create AppSuite applications, allowing unauthenticated creation.

Vulnerable vs. Patched Code

Since no patch is available, we can only describe the vulnerable code pattern.

Vulnerable Code (Conceptual):

@app.route('/appsuite/api/create', methods=['POST'])
def create_app():
    # No authentication or authorization check
    app_data = request.json
    # Directly create the application
    db.insert(app_data)
    return jsonify({"status": "created"}), 201

Patched Code (Conceptual):

@app.route('/appsuite/api/create', methods=['POST'])
@login_required
@admin_required
def create_app():
    app_data = request.json
    # Validate user permissions
    if not current_user.can_create_apps():
        return jsonify({"error": "Unauthorized"}), 403
    # Sanitize input
    sanitized_data = sanitize_app_data(app_data)
    db.insert(sanitized_data)
    return jsonify({"status": "created"}), 201

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target running desknet's NEO V4.0R1.0 to V9.0R2.0
• Network access to the AppSuite endpoint

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., /appsuite/api/create).
2. Craft a malicious application payload:

{
  "name": "MaliciousApp",
  "version": "1.0",
  "code": "alert('XSS')",
  "permissions": ["read", "write"]
}

3. Send the request:

curl -X POST https://target.com/appsuite/api/create \
  -H "Content-Type: application/json" \
  -d '{"name":"MaliciousApp","version":"1.0","code":"alert('XSS')","permissions":["read","write"]}'

4. Verify the application is created by checking the response (HTTP 201).

Note: No public exploit code is available; this is a conceptual demonstration.

Blue Team

Detection Steps:

1. Monitor for unusual POST requests to /appsuite/api/create or similar endpoints.
2. Look for application creation events without prior authentication.
3. Review server logs for unauthorized access attempts.

Hunting Query (Splunk):

index=web sourcetype=access_combined
| where uri_path="/appsuite/api/create" AND method="POST"
| where auth_user="-" OR auth_user=""
| table _time, src_ip, uri, status

Indicators of Compromise (IOCs)

• Network IOCs:
  • POST requests to /appsuite/api/create from unauthenticated sources
  • Unusual application names or payloads in request bodies
• File IOCs:
  • Unexpected AppSuite application files in the application directory
  • Modified configuration files for AppSuite
• Log IOCs:
  • HTTP 201 responses for application creation without prior login
  • Error logs showing permission bypass attempts

Detection Engineering

YARA Rule

rule CVE_2025_58079_AppSuite_Creation {
    meta:
        description = "Detects malicious AppSuite application creation attempts"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-58079"
    strings:
        $s1 = "/appsuite/api/create" ascii wide nocase
        $s2 = "POST" ascii wide nocase
        $s3 = "application/json" ascii wide nocase
    condition:
        all of them
}

Sigma Rule

title: CVE-2025-58079 - Unauthenticated AppSuite Application Creation
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects attempts to create AppSuite applications without authentication
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/appsuite/api/create'
        c-ip: '*'
    condition: selection
falsepositives:
    - Legitimate application creation by authenticated users
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-58079 - Unauthenticated AppSuite Application Creation"; flow:to_server; content:"POST"; http_method; content:"/appsuite/api/create"; http_uri; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable AppSuite: If not required, disable the AppSuite component entirely.
2. Network Segmentation: Restrict access to the AppSuite endpoint to trusted IPs only.
3. Web Application Firewall (WAF): Create a rule to block POST requests to /appsuite/api/create from unauthenticated sources.

Long-term Fix:

• Apply vendor patch when available.
• Implement proper authentication and authorization checks for all AppSuite endpoints.
• Conduct a security audit of the entire desknet's NEO installation.

Workaround:

• Modify the web server configuration to require authentication for the AppSuite API:

<Location "/appsuite/api">
    AuthType Basic
    AuthName "Restricted Access"
    AuthUserFile /etc/apache2/.htpasswd
    Require valid-user
</Location>

Valters IT