CVE-2025-47788

Executive Summary

CVE-2025-47788 is a critical path traversal vulnerability in Atheos, a self-hosted browser-based cloud IDE. Prior to version v602, the $target parameter in /controller.php was not properly validated, allowing an attacker to execute arbitrary files on the server. This vulnerability is similar to CVE-2025-22152 (GHSA-rgjm-6p59-537v). The attack vector is network-based, requires no authentication, and can lead to full server compromise. No public proof-of-concept (PoC) or exploit code has been released at this time.

Supply Chain & Package Security

Atheos is a self-hosted PHP application. The vulnerability is in the core application code, not in a package manager (NPM, PyPI, Go, Ruby). However, organizations using Atheos should treat this as a critical supply chain risk, as a compromised IDE instance could lead to code injection into projects hosted on the platform.

CVSS Breakdown & Threat Level

While a CVSS vector is not officially assigned, based on the nature of the vulnerability (unauthenticated remote file execution via path traversal), the estimated CVSS v3.1 score is 9.8 (Critical).

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

Threat Level: Critical. The vulnerability allows unauthenticated remote code execution, which is the most severe class of web application vulnerability.

Deep Dive & Mechanics

The vulnerability resides in the /controller.php file of Atheos. The $target parameter is used to determine which controller file to include and execute. Prior to v602, this parameter was not sanitized or validated against path traversal sequences (e.g., ../).

Attack Flow:

1. An attacker sends a crafted HTTP request to /controller.php with a target parameter containing path traversal sequences.
2. The application includes the file specified by the attacker, which can be any PHP file on the server.
3. If the attacker can upload a malicious PHP file (e.g., via another feature or a separate vulnerability), or if they can leverage existing files (e.g., log files, session files), they can achieve arbitrary code execution.

Example Request:

GET /controller.php?target=../../../../../../etc/passwd HTTP/1.1
Host: target.example.com

This would attempt to include /etc/passwd, but since it's not PHP, it would likely be output as text. A more dangerous request would target a PHP file:

GET /controller.php?target=../../../../../../tmp/evil.php HTTP/1.1

Vulnerable vs. Patched Code

Vulnerable Code (pre-v602):

// controller.php (vulnerable)
$target = $_GET['target'];
include($target . '.php');

Patched Code (v602):

// controller.php (patched)
$target = $_GET['target'];
$allowed = ['dashboard', 'projects', 'settings', 'users'];
if (in_array($target, $allowed)) {
    include($target . '.php');
} else {
    die('Invalid target.');
}

The patched version implements a whitelist of allowed controller names, preventing any path traversal or arbitrary file inclusion.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Deploy a vulnerable version of Atheos (v601 or earlier) on a local server (e.g., using Docker or a LAMP stack).
2. Ensure the server has a writable directory (e.g., /tmp or the uploads directory).

Exploitation Steps:

1. Upload a malicious PHP file: If the Atheos instance allows file uploads (e.g., via the IDE's file manager), upload a PHP web shell.
2. Trigger the vulnerability:

   GET /controller.php?target=../../../../../../var/www/html/uploads/shell HTTP/1.1
   Host: target.example.com
   

   (Note: The .php extension is appended automatically by the vulnerable code.)
3. Execute commands: Access the uploaded shell to execute arbitrary system commands.

Alternative (Log Poisoning): If file upload is not available, an attacker can attempt log poisoning by injecting PHP code into server logs (e.g., via the User-Agent header) and then including the log file.

Blue Team (Defensive)

Detection:

• Monitor for HTTP requests to /controller.php with unusual target parameters (e.g., containing ../, ..\\, or absolute paths).
• Alert on any inclusion of files outside the expected controllers directory.

Hunting:

• Search web server logs for requests to /controller.php with target parameters that do not match the whitelist (e.g., dashboard, projects, settings, users).
• Look for subsequent requests to uploaded PHP files or unusual system commands.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /controller.php with target parameter containing path traversal sequences (e.g., ../, ..\\, %2e%2e%2f).
  • Outbound connections from the Atheos server to unknown IP addresses (post-exploitation C2).
• File System IOCs:
  • Unexpected PHP files in the Atheos uploads directory or /tmp.
  • Modified or new files in the Atheos controllers directory.
• Process IOCs:
  • Unusual PHP processes running with elevated privileges.
  • Execution of system commands (e.g., id, whoami, nc) from the web server context.

Detection Engineering

YARA Rule

rule CVE_2025_47788_Atheos_Path_Traversal {
    meta:
        description = "Detects path traversal attempts targeting Atheos CVE-2025-47788"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-47788"
    strings:
        $path_traversal = /target=[^&]*\.\.\// nocase
        $controller_php = "/controller.php" nocase
    condition:
        $controller_php and $path_traversal
}

Sigma Rule

title: CVE-2025-47788 Atheos Path Traversal Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests attempting to exploit CVE-2025-47788 in Atheos
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem: '/controller.php'
        cs-uri-query|contains: 'target='
    filter:
        cs-uri-query|contains:
            - 'target=dashboard'
            - 'target=projects'
            - 'target=settings'
            - 'target=users'
    condition: selection and not filter
falsepositives:
    - Legitimate use of custom controllers (unlikely in standard Atheos)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-47788 Atheos Path Traversal Attempt"; flow:to_server,established; content:"/controller.php"; http_uri; content:"target="; http_uri; pcre:"/target=[^&]*\.\.\//i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade Atheos: Update to version v602 or later immediately.
2. Web Application Firewall (WAF): Deploy a WAF rule to block requests to /controller.php with path traversal patterns in the target parameter.
3. Input Validation: If immediate patching is not possible, implement a whitelist of allowed controller names in the application code.

Long-Term Mitigations:

• Principle of Least Privilege: Run the Atheos web server with minimal file system permissions.
• Disable File Uploads: If not required, disable file upload functionality in Atheos.
• Regular Security Audits: Conduct periodic code reviews and penetration testing of the Atheos instance.
• Monitor Logs: Enable centralized logging and alerting for suspicious web requests.

Valters IT Signature

This report was generated by Valters IT Cyber Threat Intelligence Division. For questions, contact intel@valters-it.com.