attack-tree.md

Attack Tree Analysis for rikkaapps/shizuku

Objective: Attacker's Goal: To compromise an application that uses Shizuku by exploiting weaknesses or vulnerabilities related to Shizuku. Specifically focusing on High-Risk Paths and Critical Nodes.

Attack Tree Visualization

Attack Goal: [**CR**] Compromise Application Using Shizuku
├───[OR]─ [**CR**] Exploit Shizuku Server Vulnerabilities [**HR**]
│   ├───[OR]─ [**CR**] Vulnerabilities in Shizuku Server Code [**HR**]
│   │   ├───[AND]─ [**CR**] Memory Corruption (Buffer Overflow, Heap Overflow) [**HR**]
│   │   │       └─── Action: Fuzz Shizuku server, Static/Dynamic analysis of Shizuku server code.
│   │   ├───[AND]─ [**CR**] Injection Vulnerabilities (Command Injection, Path Traversal) [**HR**]
│   │   │       └─── Action: Analyze Shizuku server input handling, identify potential injection points.
│   ├───[OR]─ [**CR**] Man-in-the-Middle (MitM) Attack during Shizuku Setup/Communication [**HR**]
│   │   ├───[AND]─ [**CR**] MitM during ADB Setup (if ADB method used) [**HR**]
│   │   │       └─── Action:  Network sniffing during ADB setup, exploit insecure ADB connection.
├───[OR]─ [**CR**] Exploit Application's Shizuku Integration [**HR**]
│   ├───[OR]─ [**CR**] Insecure Use of Shizuku APIs by Application [**HR**]
│   │   ├───[AND]─ [**CR**] Improper Input Validation before Shizuku API Calls [**HR**]
│   │   │       └─── Action:  Analyze application code for input validation gaps before Shizuku API usage.
│   │   ├───[AND]─ Over-Privileged Shizuku Permissions Requested by Application [**HR**]
│   │   │       └─── Action:  Review application's Shizuku permission requests, identify unnecessary permissions.
├───[OR]─ [**CR**] Social Engineering Attacks Related to Shizuku [**HR**]
│   ├───[AND]─ [**CR**] Tricking User into Granting Excessive Shizuku Permissions [**HR**]
│   │       └─── Action:  User education on Shizuku permissions, application permission review process.
│   ├───[AND]─ [**CR**] Malicious Shizuku Server Installation/Modification [**HR**]
│   │       └─── Action:  Verify Shizuku server integrity, use official sources for Shizuku server.

Attack Tree Path: Exploit Shizuku Server Vulnerabilities [HR]

• Critical Node: Vulnerabilities in Shizuku Server Code [CR]

  • High-Risk Path: Memory Corruption (Buffer Overflow, Heap Overflow) [HR]
    • Attack Vectors:
      • Fuzzing Shizuku server with malformed inputs to trigger memory errors.
      • Reverse engineering Shizuku server code to identify potential buffer overflow or heap overflow vulnerabilities.
      • Exploiting vulnerabilities in third-party libraries used by Shizuku server.
    • Potential Impact: System-level code execution, complete device compromise, control over all applications using Shizuku.
  • High-Risk Path: Injection Vulnerabilities (Command Injection, Path Traversal) [HR]
    • Attack Vectors:
      • Injecting malicious commands through input fields processed by Shizuku server.
      • Exploiting path traversal vulnerabilities to access or modify unauthorized files on the system.
      • Manipulating input parameters to bypass security checks and execute arbitrary code.
    • Potential Impact: System-level command execution, unauthorized file access, privilege escalation.

• Critical Node: Man-in-the-Middle (MitM) Attack during Shizuku Setup/Communication [CR]

  • High-Risk Path: MitM during ADB Setup (if ADB method used) [HR]
    • Attack Vectors:
      • Network sniffing on the same network as the device during ADB setup.
      • ARP poisoning or DNS spoofing to redirect traffic during ADB setup.
      • Exploiting insecure or unencrypted ADB connections to intercept communication.
    • Potential Impact: Compromise Shizuku server setup process, inject malicious Shizuku server, gain control over Shizuku server and applications using it.

Attack Tree Path: Exploit Application's Shizuku Integration [HR]

• Critical Node: Insecure Use of Shizuku APIs by Application [CR]
  • High-Risk Path: Improper Input Validation before Shizuku API Calls [HR]
    • Attack Vectors:
      • Providing malicious input to the application that is then passed to Shizuku APIs without proper validation.
      • Exploiting format string vulnerabilities if input is used in format strings for Shizuku API calls.
      • Bypassing client-side validation and directly sending malicious requests to the application that are then processed by Shizuku.
    • Potential Impact: Execution of privileged operations with attacker-controlled parameters, data manipulation, unauthorized access to system resources, application compromise.
  • High-Risk Path: Over-Privileged Shizuku Permissions Requested by Application [HR]
    • Attack Vectors:
      • Compromising the application through other vulnerabilities (not directly Shizuku related).
      • Leveraging the excessively granted Shizuku permissions to perform actions beyond the application's intended scope.
      • Confused deputy attacks where a malicious co-installed application exploits the target application's broad Shizuku permissions.
    • Potential Impact: Increased attack surface, greater potential damage if the application is compromised, broader access to system functionalities than necessary.

Attack Tree Path: Social Engineering Attacks Related to Shizuku [HR]

• Critical Node: Tricking User into Granting Excessive Shizuku Permissions [CR]

  • High-Risk Path: Tricking User into Granting Excessive Shizuku Permissions [HR]
    • Attack Vectors:
      • Misleading users about the necessity of broad Shizuku permissions through deceptive UI or descriptions.
      • Bundling permission requests with seemingly legitimate actions to trick users into granting them without careful consideration.
      • Exploiting user fatigue or lack of technical understanding to encourage granting permissions quickly.
    • Potential Impact: User grants more permissions than needed, increasing the application's attack surface and potential for misuse if compromised.

• Critical Node: Malicious Shizuku Server Installation/Modification [CR]

  • High-Risk Path: Malicious Shizuku Server Installation/Modification [HR]
    • Attack Vectors:
      • Distributing modified Shizuku server APKs through unofficial channels or websites.
      • Tricking users into installing a malicious Shizuku server disguised as the official version.
      • Compromising official distribution channels to replace the legitimate Shizuku server with a malicious one.
    • Potential Impact: Installation of a backdoored or malicious Shizuku server, allowing attacker to control all applications using Shizuku, system-wide compromise.