attack-tree.md

Attack Tree Analysis for square/picasso

Objective: To execute arbitrary code on the application server, leak sensitive data displayed in images, or cause a denial-of-service (DoS) condition specifically by exploiting vulnerabilities or misconfigurations related to the Picasso library.

Attack Tree Visualization

                                     +-------------------------------------------------+
                                     |  Compromise Application via Picasso Exploitation  |
                                     +-------------------------------------------------+
                                                     |
         +--------------------------------------------------------------------------------+
         |                                                                                |
+---------------------+                                                         
| Arbitrary Code      |                                                         
| Execution (ACE)     |                                                         
+---------------------+                                                         
         |                                                                                
+--------+--------+                                                       
|        |        |                                                       
|  1.1   |  1.2   |                                                       
|Exploit|Exploit|                                                       
|Down-  |Trans- |                                                       
|loader |former |                                                       
|Vuln   |Vuln   |                                                       
+--------+--------+                                                       
         |                                                                                
+--------+--------+[HR]                                                     
|        |        |                                                       
| 1.1.1  | 1.2.1  |                                                       
|  RCE   |  RCE   |                                                       
| via    | via    |[CN]                                                       
|Custom |Custom |                                                       
|Down-  |Trans- |                                                       
|loader |former |                                                       
| [CN]  | [CN]  |                                                       
+--------+--------+                                                       
         |                                                                                
+--------+--------+                                                       
|        |        |                                                       
| 1.1.2  |        |                                                       
| Bypass |        |                                                       
|  URL   |        |                                                       
|Valida- |        |                                                       
| tion  |        |                                                       
| [CN]  |        |                                                       
+--------+--------+
         |
+--------+
|        |
| 2.1   |
|  Leak  |
|Cached  |
|Images  |
+--------+
         |
+--------+
|        |
| 2.1.1  |
|  No    |
|  Auth  |
|  on    |
|Cached  |
|Files   |
| [CN]  |
+--------+
         |
+--------+
|        |
| 2.1.2  |
|  Path  |
|Traver- |
|  sal   |
| [CN]  |
+--------+

Attack Tree Path: 1. Arbitrary Code Execution (ACE)

• 1.1 Exploit Downloader Vulnerability

  • Description: Attackers exploit vulnerabilities in custom Downloader implementations to achieve RCE.
  • 1.1.1 RCE via Custom Downloader [CN] [HR]
    • Description: A custom Downloader contains flaws (e.g., unvalidated input, command injection, deserialization issues) allowing attackers to execute arbitrary code.
    • Likelihood: Medium
    • Impact: Very High
    • Effort: Medium to High
    • Skill Level: Intermediate to Advanced
    • Detection Difficulty: Medium to Hard
  • 1.1.2 Bypass URL Validation [CN]
    • Description: Weak or bypassed URL validation allows attackers to load images from arbitrary locations, potentially leading to SSRF or other attacks.
    • Likelihood: Low to Medium
    • Impact: High to Very High
    • Effort: Low to Medium
    • Skill Level: Intermediate
    • Detection Difficulty: Medium

• 1.2 Exploit Transformer Vulnerability

  • Description: Attackers exploit vulnerabilities in custom Transformation implementations to achieve RCE.
  • 1.2.1 RCE via Custom Transformer [CN] [HR]
    • Description: A custom Transformation contains flaws (e.g., unvalidated input, command injection, deserialization issues, or vulnerabilities in native libraries) allowing attackers to execute arbitrary code.
    • Likelihood: Medium
    • Impact: Very High
    • Effort: Medium to High
    • Skill Level: Intermediate to Advanced
    • Detection Difficulty: Medium to Hard

Attack Tree Path: 2. Data Leakage

• 2.1 Leak Cached Images
  • Description: Attackers gain unauthorized access to cached image files.
  • 2.1.1 No Authorization on Cached Files [CN]
    • Description: The application lacks proper authorization checks for accessing the cache directory, allowing direct access to cached images.
    • Likelihood: Low
    • Impact: Medium to High
    • Effort: Very Low
    • Skill Level: Novice
    • Detection Difficulty: Easy
  • 2.1.2 Path Traversal [CN]
    • Description: A vulnerability in how Picasso handles file paths for cached images could allow an attacker to use ".." sequences to access files outside the intended cache directory.
    • Likelihood: Low
    • Impact: Medium to High
    • Effort: Medium
    • Skill Level: Intermediate
    • Detection Difficulty: Medium