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Attack Tree Analysis for phpoffice/phppresentation

Objective: Compromise application using PHPPresentation by exploiting vulnerabilities within PHPPresentation itself.

Attack Tree Visualization

High-Risk Attack Sub-Tree: Compromise Application via PHPPresentation (High-Risk Paths)

├─── [HIGH-RISK PATH] [1.0] Exploit File Parsing Vulnerabilities │ ├─── [HIGH-RISK PATH] [1.1] XML External Entity (XXE) Injection │ │ ├─── [CRITICAL NODE] [1.1.1.a] Upload/Process malicious file via application │ │ └─── [CRITICAL NODE] [1.1.2] Trigger PHPPresentation to parse malicious XML │ │ └─── [HIGH-RISK PATH] [1.1.3] Exfiltrate sensitive data (local files, internal network info) │ │ ├─── [HIGH-RISK PATH] [1.1.3.a] Read server-side files (e.g., configuration, source code) │ │ └─── [HIGH-RISK PATH] [1.1.3.b] Perform Server-Side Request Forgery (SSRF) │ ├─── [HIGH-RISK PATH] [1.3] Denial of Service (DoS) via Resource Exhaustion │ │ ├─── [CRITICAL NODE] [1.3.1.a] Upload/Process malicious file via application │ │ └─── [CRITICAL NODE] [1.3.2] Trigger PHPPresentation to parse file leading to high resource consumption ├─── [HIGH-RISK PATH] [2.0] Exploit File Upload/Processing Vulnerabilities (Application Level, leveraging PHPPresentation) │ ├─── [HIGH-RISK PATH] [2.1] Malicious File Upload leading to RCE │ │ ├─── [CRITICAL NODE] [2.1.1.a] Application allows file uploads without proper validation │ │ └─── [CRITICAL NODE] [2.1.2] Application processes the uploaded file using PHPPresentation and executes embedded code │ │ └─── [HIGH-RISK PATH] [2.1.3] Gain shell access or control over the server │ ├─── [HIGH-RISK PATH] [2.2] Path Traversal via Filename Manipulation │ │ ├─── [CRITICAL NODE] [2.2.1.a] Application uses filenames from presentation file without sanitization │ │ └─── [HIGH-RISK PATH] [2.2.3] Read or write arbitrary files on the server └───[3.0] Exploit Dependency Vulnerabilities ├─── [CRITICAL NODE] [3.2.1.a] Craft specific presentation file or input to trigger vulnerability

Attack Tree Path: [1.0] Exploit File Parsing Vulnerabilities (High-Risk Path)

  • Attack Vector: Exploiting vulnerabilities in how PHPPresentation parses presentation file formats, particularly XML-based formats.
  • Potential Impact: Information Disclosure, Denial of Service, potentially Remote Code Execution (though less likely for buffer overflows in this context, XXE is more probable).

Attack Tree Path: [1.1] XML External Entity (XXE) Injection (High-Risk Path)

  • Vulnerability: If PHPPresentation uses an XML parser that is not securely configured, it might be vulnerable to XXE injection. This allows an attacker to include external entities in a malicious presentation file.
  • Potential Impact:
    • [1.1.3.a] Read server-side files (e.g., configuration, source code) (High-Risk Path): Attacker can read local files on the server by defining an external entity pointing to the file path. This can expose sensitive configuration files, source code, or other internal data.
    • [1.1.3.b] Perform Server-Side Request Forgery (SSRF) (High-Risk Path): Attacker can make the server initiate requests to internal or external systems by defining an external entity pointing to a URL. This can be used to probe internal networks or interact with internal services.
  • Critical Nodes:
    • [CRITICAL NODE] [1.1.1.a] Upload/Process malicious file via application: This is the entry point where the attacker uploads a malicious presentation file containing the XXE payload.
    • [CRITICAL NODE] [1.1.2] Trigger PHPPresentation to parse malicious XML: This is the step where PHPPresentation's vulnerable XML parsing functionality is triggered by the malicious file, leading to the XXE injection.

Attack Tree Path: [1.1.3.a] Read server-side files (e.g., configuration, source code) (High-Risk Path)

Attacker can read local files on the server by defining an external entity pointing to the file path. This can expose sensitive configuration files, source code, or other internal data.

Attack Tree Path: [1.1.3.b] Perform Server-Side Request Forgery (SSRF) (High-Risk Path)

Attacker can make the server initiate requests to internal or external systems by defining an external entity pointing to a URL. This can be used to probe internal networks or interact with internal services.

Attack Tree Path: [1.3] Denial of Service (DoS) via Resource Exhaustion (High-Risk Path)

  • Vulnerability: PHPPresentation might be vulnerable to DoS attacks if it can be forced to consume excessive resources (CPU, memory, I/O) when parsing specially crafted presentation files.
  • Potential Impact: Application unavailability, service disruption for legitimate users.
  • Critical Nodes:
    • [CRITICAL NODE] [1.3.1.a] Upload/Process malicious file via application: The attacker uploads a specially crafted presentation file designed to consume excessive resources during parsing.
    • [CRITICAL NODE] [1.3.2] Trigger PHPPresentation to parse file leading to high resource consumption: PHPPresentation's parsing process becomes resource-intensive due to the malicious file, leading to DoS.

Attack Tree Path: [2.0] Exploit File Upload/Processing Vulnerabilities (Application Level, leveraging PHPPresentation) (High-Risk Path)

  • Attack Vector: Exploiting vulnerabilities in how the application handles file uploads and processes files using PHPPresentation, rather than vulnerabilities within PHPPresentation's code itself.
  • Potential Impact: Remote Code Execution, Arbitrary File Read/Write, Application Compromise.

Attack Tree Path: [2.1] Malicious File Upload leading to RCE (High-Risk Path)

  • Vulnerability: If the application allows file uploads without proper validation and subsequently processes these files in a way that can lead to code execution, an attacker can upload a malicious file disguised as a presentation file.
  • Potential Impact: Remote Code Execution, full control over the server.
  • Critical Nodes:
    • [CRITICAL NODE] [2.1.1.a] Application allows file uploads without proper validation: This is a critical application-level vulnerability – lack of proper file type and content validation on uploads.
    • [CRITICAL NODE] [2.1.2] Application processes the uploaded file using PHPPresentation and executes embedded code: This highlights a vulnerability in the application's file handling logic after PHPPresentation processing, potentially leading to execution of malicious code.
    • [2.1.3] Gain shell access or control over the server (High-Risk Path): The ultimate goal of RCE, achieving full system compromise.

Attack Tree Path: [2.2] Path Traversal via Filename Manipulation (High-Risk Path)

  • Vulnerability: If the application or PHPPresentation extracts filenames or paths from within presentation files and uses them without proper sanitization, an attacker can craft a presentation file with malicious filenames containing path traversal sequences.
  • Potential Impact: Arbitrary File Read/Write, potentially leading to access to sensitive data or modification of critical application files.
  • Critical Nodes:
    • [CRITICAL NODE] [2.2.1.a] Application uses filenames from presentation file without sanitization: This is a critical application-level vulnerability – lack of sanitization of filenames extracted from presentation files.
    • [2.2.3] Read or write arbitrary files on the server (High-Risk Path): The attacker's goal of exploiting path traversal to access or modify files outside the intended application directory.

Attack Tree Path: [3.0] Exploit Dependency Vulnerabilities

  • Attack Vector: Exploiting known vulnerabilities in libraries that PHPPresentation depends on.
  • Potential Impact: Depends on the specific dependency vulnerability - could be Remote Code Execution, Denial of Service, Information Disclosure, etc.
  • Critical Nodes:
    • [CRITICAL NODE] [3.2.1.a] Craft specific presentation file or input to trigger vulnerability: This is the crucial step where the attacker crafts a presentation file designed to trigger a known vulnerability in one of PHPPresentation's dependencies through PHPPresentation's usage of that dependency.