Skip to content

Latest commit

 

History

History
28 lines (23 loc) · 4.5 KB

attack-surface.md

File metadata and controls

28 lines (23 loc) · 4.5 KB

Attack Surface Analysis for airbnb/lottie-android

Attack Surface: 1. Untrusted Animation Data Processing

  • Description: Critical vulnerabilities arising from lottie-android parsing and processing maliciously crafted animation data from untrusted sources. Exploits target weaknesses in the library's parsing logic.
  • How lottie-android Contributes: lottie-android's core functionality is parsing and rendering animation data, typically JSON. Maliciously crafted JSON can directly exploit vulnerabilities within lottie-android's parsing implementation.
  • Example: A specially crafted JSON animation file is loaded by lottie-android. This file contains structures designed to trigger a buffer overflow or integer overflow vulnerability during parsing within the lottie-android library itself, leading to a crash or potentially remote code execution.
  • Impact: Denial of Service (DoS), potentially Remote Code Execution (RCE) if parsing vulnerabilities are severe enough to allow memory corruption and code injection.
  • Risk Severity: Critical (If RCE is possible) to High (If DoS is easily achievable and severely impacts application).
  • Mitigation Strategies:
    • Input Validation (Strict Parsing): While difficult to fully validate complex JSON structures, implement checks to reject excessively large animation files or files with suspiciously deep nesting before passing them to lottie-android for parsing.
    • Sandboxing (Process Isolation): If feasible, isolate the lottie-android parsing and rendering process in a separate, sandboxed process with minimal permissions. This limits the impact if a parsing vulnerability is exploited.
    • Regular Updates (Lottie Library): Immediately update lottie-android to the latest version to benefit from bug fixes and security patches released by the library maintainers that address parsing vulnerabilities.
    • Security Audits (of Lottie Usage): Conduct security audits focusing on how animation data is sourced and loaded into lottie-android to identify potential injection points of malicious animations.

Attack Surface: 2. Resource Loading and Path Traversal within Animations

  • Description: High risk of path traversal vulnerabilities due to lottie-android handling resource paths specified within animation data. Malicious animations could attempt to access files outside intended asset directories.
  • How lottie-android Contributes: lottie-android interprets paths to external resources (images, fonts) embedded within animation JSON. If lottie-android doesn't properly sanitize or restrict these paths, it becomes the mechanism by which path traversal attacks can be executed.
  • Example: An attacker crafts an animation file with a resource path like "images/../../../sensitive_data.png". When lottie-android attempts to load this resource based on the animation instructions, and if path sanitization is insufficient within lottie-android or the application, it could potentially access and load the sensitive file, leading to unauthorized data access.
  • Impact: Path Traversal, Unauthorized File Access, potential Information Disclosure of sensitive local files.
  • Risk Severity: High (If path traversal is easily exploitable and can lead to access of sensitive application or system files).
  • Mitigation Strategies:
    • Restrict Resource Paths (Lottie Configuration): Configure lottie-android (if configuration options are available) to strictly limit resource loading to a predefined, secure directory within the application's assets or resources.
    • Path Sanitization (Application-Side): Before passing animation data to lottie-android, pre-process the animation JSON to sanitize or validate all resource paths. Ensure paths are relative to the intended asset directory and do not contain path traversal sequences like ../.
    • Content Security Policy (for Resources - if applicable in future Lottie versions): If future versions of lottie-android offer a mechanism to define a Content Security Policy for resources, utilize it to strictly control allowed resource locations.
    • Principle of Least Privilege (File Permissions): Ensure the application and lottie-android process run with minimal file system permissions, limiting the damage even if a path traversal vulnerability is exploited.