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Attack Tree Analysis for thephpleague/flysystem

Objective: Attacker's Goal: To compromise application that use given project by exploiting weaknesses or vulnerabilities within the project itself.

Attack Tree Visualization

[CRITICAL NODE] Compromise Application via Flysystem Exploitation ├─── OR ─ [CRITICAL NODE] Exploit Flysystem Misconfiguration [HIGH-RISK PATH START] │ ├─── AND ─ [CRITICAL NODE] Insecure Adapter Configuration [HIGH-RISK PATH] │ │ ├─── [CRITICAL NODE] Exploit Weak Adapter Credentials [HIGH-RISK PATH] │ │ │ └─── [HIGH-RISK PATH] Exposed Credentials in Code/Config Files │ │ │ └─── Default/Weak Credentials │ │ ├─── [HIGH-RISK PATH] Overly Permissive Adapter Permissions │ │ │ └─── [HIGH-RISK PATH] Publicly Accessible Storage (e.g., S3 bucket misconfiguration) │ └─── AND ─ Exposed Configuration Information [HIGH-RISK PATH END] │ └─── Configuration Files Accessible to Attacker │ ├─── OR ─ [CRITICAL NODE] Exploit Flysystem API Misuse in Application [HIGH-RISK PATH START] │ ├─── AND ─ [CRITICAL NODE] Path Traversal Vulnerability [HIGH-RISK PATH] │ │ └─── [HIGH-RISK PATH] Insufficient Input Sanitization on File Paths │ ├─── AND ─ [CRITICAL NODE] Unrestricted File Upload Vulnerability [HIGH-RISK PATH] │ │ ├─── [HIGH-RISK PATH] No File Type Validation │ │ │ └─── [HIGH-RISK PATH] Upload Malicious Executable Files (Web Shells, Malware) │ │ ├─── [HIGH-RISK PATH] No Content Validation/Scanning │ │ │ └─── [HIGH-RISK PATH] Upload Files with Malicious Payloads (e.g., XSS, CSRF triggers in HTML files) │ ├─── AND ─ [CRITICAL NODE] Insecure File Handling After Retrieval [HIGH-RISK PATH] │ │ ├─── [HIGH-RISK PATH] Direct Execution of Uploaded Files │ │ │ └─── [HIGH-RISK PATH] Web Shell Execution │ │ ├─── [HIGH-RISK PATH] Insecure File Content Display │ │ │ └─── [HIGH-RISK PATH] XSS Vulnerabilities when displaying file content without sanitization └─── OR ─ Exploit Vulnerabilities in Flysystem Library Itself [HIGH-RISK PATH END] └─── AND ─ Known Vulnerabilities in Flysystem Version └─── Outdated Flysystem Version Used

Attack Tree Path: [CRITICAL NODE] Compromise Application via Flysystem Exploitation

Description: The attacker's ultimate goal is to compromise the application by exploiting vulnerabilities related to its use of the Flysystem library. Success at this level means the attacker has achieved a significant breach, potentially gaining unauthorized access, control, or causing damage to the application and its data.

Attack Tree Path: [CRITICAL NODE] Exploit Flysystem Misconfiguration

Description: This path focuses on exploiting vulnerabilities arising from incorrect or insecure configuration of Flysystem and its adapters. Misconfiguration is often a simpler attack vector than exploiting code-level vulnerabilities.

  • Attack Vectors:
    • [CRITICAL NODE] Insecure Adapter Configuration:
      • Description: Focuses on weaknesses in how the specific Flysystem adapter (e.g., for AWS S3, local storage, etc.) is configured.
      • Attack Vectors:
        • [CRITICAL NODE] Exploit Weak Adapter Credentials:
          • Description: Exploiting weak, default, or exposed credentials used to authenticate with the storage backend.
          • Attack Vectors:
            • [HIGH-RISK PATH] Exposed Credentials in Code/Config Files: Credentials are hardcoded in application code or configuration files that are accessible to attackers (e.g., through public repositories, insecure server configurations).
            • Default/Weak Credentials: Using default or easily guessable credentials for storage adapters.
        • [HIGH-RISK PATH] Overly Permissive Adapter Permissions:
          • Description: Exploiting overly permissive access control settings on the storage backend itself (e.g., publicly readable/writable cloud storage buckets).
          • Attack Vectors:
            • [HIGH-RISK PATH] Publicly Accessible Storage (e.g., S3 bucket misconfiguration): Cloud storage buckets are misconfigured to allow public access when they should be private.
    • Exposed Configuration Information:
      • Description: Gaining access to sensitive configuration details that reveal information about the Flysystem setup and potentially credentials or paths.
      • Attack Vectors:
        • Configuration Files Accessible to Attacker: Configuration files containing Flysystem settings are accessible to attackers due to misconfigured web servers or directory traversal vulnerabilities.

Attack Tree Path: [CRITICAL NODE] Exploit Flysystem API Misuse in Application

Description: This path targets vulnerabilities stemming from how developers incorrectly or insecurely use the Flysystem API within the application's code.

  • Attack Vectors:
    • [CRITICAL NODE] Path Traversal Vulnerability:
      • Description: Exploiting insufficient input sanitization when constructing file paths for Flysystem operations, allowing attackers to access files outside of intended directories.
      • Attack Vectors:
        • [HIGH-RISK PATH] Insufficient Input Sanitization on File Paths: Application fails to properly validate and sanitize user-provided input used in file paths.
    • [CRITICAL NODE] Unrestricted File Upload Vulnerability:
      • Description: Exploiting vulnerabilities in file upload functionality that uses Flysystem, allowing attackers to upload malicious files.
      • Attack Vectors:
        • [HIGH-RISK PATH] No File Type Validation: Application does not validate file types during upload.
          • [HIGH-RISK PATH] Upload Malicious Executable Files (Web Shells, Malware): Attackers upload executable files (e.g., web shells) due to lack of file type validation.
        • [HIGH-RISK PATH] No Content Validation/Scanning: Application does not scan or validate the content of uploaded files.
          • [HIGH-RISK PATH] Upload Files with Malicious Payloads (e.g., XSS, CSRF triggers in HTML files): Attackers upload files containing malicious payloads like XSS scripts due to lack of content validation.
    • [CRITICAL NODE] Insecure File Handling After Retrieval:
      • Description: Exploiting vulnerabilities in how the application processes files after retrieving them from storage using Flysystem.
      • Attack Vectors:
        • [HIGH-RISK PATH] Direct Execution of Uploaded Files: Application directly executes uploaded files without proper security measures.
          • [HIGH-RISK PATH] Web Shell Execution: Direct execution of uploaded web shell files leads to server compromise.
        • [HIGH-RISK PATH] Insecure File Content Display: Application displays file content without proper sanitization, leading to client-side vulnerabilities.
          • [HIGH-RISK PATH] XSS Vulnerabilities when displaying file content without sanitization: Displaying unsanitized file content (e.g., HTML) leads to Cross-Site Scripting vulnerabilities.

Attack Tree Path: Exploit Vulnerabilities in Flysystem Library Itself

Description: This path considers exploiting vulnerabilities within the Flysystem library itself, although less likely than misconfiguration or API misuse.

  • Attack Vectors:
    • Known Vulnerabilities in Flysystem Version:
      • Description: Exploiting publicly known vulnerabilities in a specific version of Flysystem being used by the application.
      • Attack Vectors:
        • Outdated Flysystem Version Used: Application uses an outdated version of Flysystem that contains known vulnerabilities.