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Attack Tree Analysis for ibireme/yykit

Objective: Unauthorized Code Execution, Data Exfiltration, or Denial of Service via YYKit

Attack Tree Visualization

Attacker's Goal: Unauthorized Code Execution, Data Exfiltration, or Denial of Service via YYKit

└── 1. Unauthorized Code Execution ├── 1.1 Exploiting YYImage (Image Processing) [HIGH-RISK] │ ├── 1.1.1 Image Decoding Vulnerability (e.g., buffer overflow in custom decoder) [CRITICAL] │ │ ├── 1.1.1.1 Craft malicious image file (e.g., oversized image, corrupted headers) │ │ └── 1.1.1.2 Trigger image decoding via YYImage API (e.g., YYImage imageWithData:) │ └── 1.1.3 Exploiting Image Format Conversion (e.g., WebP, APNG) [HIGH-RISK] │ ├── 1.1.3.1 Identify vulnerabilities in underlying image format libraries used by YYImage. [CRITICAL] │ └── 1.1.3.2 Craft malicious image in vulnerable format. ├── 1.2 Exploiting YYModel (Model Mapping) [HIGH-RISK] │ ├── 1.2.1 Deserialization Vulnerability (if custom deserialization logic is used) [CRITICAL] │ │ ├── 1.2.1.1 Craft malicious JSON/data payload. │ │ └── 1.2.1.2 Trigger model mapping from malicious data (e.g., [YYModel modelWithJSON:]). ├── 1.3 Exploiting YYCache (Caching) │ └── 1.3.2 Deserialization Vulnerability (if cached objects are deserialized without validation) [CRITICAL] │ ├── 1.3.2.1 Store malicious serialized object in the cache. │ └── 1.3.2.2 Retrieve and deserialize the malicious object, leading to code execution. └── 1.4 Exploiting YYText (Rich Text) └── 1.4.1 XSS-like Vulnerability (if YYText is used to render untrusted HTML-like content) [HIGH-RISK] ├── 1.4.1.1 Craft malicious text with embedded scripts or malicious attributes. └── 1.4.1.2 Render the malicious text using YYText, potentially executing scripts in a UIWebView/WKWebView context. [CRITICAL]

Attack Tree Path: 1.1 Exploiting YYImage (Image Processing) [HIGH-RISK]

  • Description: This attack vector focuses on vulnerabilities within YYKit's image processing component, YYImage. The primary concern is with image decoding, where a maliciously crafted image file can exploit vulnerabilities in the decoding process (e.g., buffer overflows, integer overflows) to achieve arbitrary code execution. Exploiting format conversion vulnerabilities relies on finding and leveraging weaknesses in the underlying libraries that YYImage uses for formats like WebP or APNG.

  • 1.1.1 Image Decoding Vulnerability [CRITICAL]

    • 1.1.1.1 Craft malicious image file:
      • Likelihood: Medium
      • Impact: High
      • Effort: Medium
      • Skill Level: Intermediate to Advanced
      • Detection Difficulty: Medium
    • 1.1.1.2 Trigger image decoding:
      • Likelihood: High
      • Impact: High
      • Effort: Very Low
      • Skill Level: Novice
      • Detection Difficulty: Very Easy

  • 1.1.3 Exploiting Image Format Conversion [HIGH-RISK]

    • 1.1.3.1 Identify vulnerabilities in underlying libraries [CRITICAL]:
      • Likelihood: Medium
      • Impact: High
      • Effort: High
      • Skill Level: Advanced to Expert
      • Detection Difficulty: Hard
    • 1.1.3.2 Craft malicious image:
      • Likelihood: Medium
      • Impact: High
      • Effort: Medium
      • Skill Level: Intermediate to Advanced
      • Detection Difficulty: Medium

Attack Tree Path: 1.2 Exploiting YYModel (Model Mapping) [HIGH-RISK]

  • Description: This attack vector targets YYModel, YYKit's component for mapping data (like JSON) to model objects. The most significant risk is a deserialization vulnerability, particularly if custom deserialization logic is implemented. If an attacker can control the input data used for deserialization, they might be able to inject malicious code.

  • 1.2.1 Deserialization Vulnerability [CRITICAL]

    • 1.2.1.1 Craft malicious JSON/data payload:
      • Likelihood: Medium
      • Impact: High
      • Effort: Medium
      • Skill Level: Intermediate to Advanced
      • Detection Difficulty: Medium
    • 1.2.1.2 Trigger model mapping:
      • Likelihood: High
      • Impact: High
      • Effort: Very Low
      • Skill Level: Novice
      • Detection Difficulty: Very Easy

Attack Tree Path: 1.3 Exploiting YYCache (Caching)

  • Description: This attack vector focuses on YYCache. The critical vulnerability here is similar to the YYModel deserialization issue: if objects are cached and then deserialized without proper validation, an attacker could inject malicious code by manipulating the cached data.

  • 1.3.2 Deserialization Vulnerability [CRITICAL]

    • 1.3.2.1 Store malicious serialized object:
      • Likelihood: Low to Medium
      • Impact: High
      • Effort: High
      • Skill Level: Advanced
      • Detection Difficulty: Hard
    • 1.3.2.2 Retrieve and deserialize:
      • Likelihood: High
      • Impact: High
      • Effort: Very Low
      • Skill Level: Novice
      • Detection Difficulty: Medium

Attack Tree Path: 1.4 Exploiting YYText (Rich Text) [HIGH-RISK]

  • Description: This attack vector targets YYText, YYKit's rich text component. The primary concern is an XSS-like vulnerability. If YYText is used to render untrusted input that contains HTML-like structures or scripting elements, and this content is then displayed in a UIWebView or WKWebView, it could lead to the execution of malicious scripts within the web view's context.

  • 1.4.1 XSS-like Vulnerability [HIGH-RISK]

    • 1.4.1.1 Craft malicious text:
      • Likelihood: Medium
      • Impact: High
      • Effort: Low
      • Skill Level: Intermediate
      • Detection Difficulty: Medium
    • 1.4.1.2 Render the malicious text [CRITICAL]:
      • Likelihood: High
      • Impact: High
      • Effort: Very Low
      • Skill Level: Novice
      • Detection Difficulty: Very Easy