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Attack Surface Analysis for emilk/egui

Attack Surface: Unvalidated Text Input (Through egui Widgets)

  • Description: The application uses data entered into egui text fields without proper validation or sanitization before using it in security-sensitive operations. This is the most common and direct way egui contributes to vulnerabilities.
  • How egui Contributes: egui provides the text input widgets (e.g., ui.text_edit_singleline(), ui.text_edit_multiline()) but performs no validation or sanitization. The application must handle this.
  • Example: An egui text field collects a filename, which is then used directly in an std::fs::File::open() call without checking for path traversal characters ("../").
  • Impact: Leads to various attacks depending on the context:
    • Cross-Site Scripting (XSS) - if displayed unsanitized in a web context.
    • Server-Side Request Forgery (SSRF) - if used to construct URLs.
    • Command Injection - if used in system commands.
    • Path Traversal - if used to construct file paths.
  • Risk Severity: High to Critical (depending on the specific use of the input).
  • Mitigation Strategies:
    • Developer: Implement strict input validation immediately after receiving input from the egui widget. Use allow-lists (whitelists) whenever possible. Validate format, length, and allowed characters. Sanitize to remove or escape dangerous characters. Use a dedicated input validation library. Contextual escaping is crucial (e.g., HTML escaping for web display). Never trust input from egui widgets directly.
    • User: No direct user mitigation; this is entirely a developer responsibility.

Attack Surface: Unvalidated Drag-and-Drop Data (Handled via egui)

  • Description: The application processes data received via egui's drag-and-drop functionality without any validation. This is a direct attack vector facilitated by egui.
    • How egui Contributes: egui provides the drag-and-drop mechanism; the application receives the dropped data through egui's API.
    • Example: An egui application allows users to drag and drop files, and it immediately executes the dropped file without checking if it's an executable or verifying its contents.
    • Impact:
      • Execution of arbitrary code (if the dropped data is a malicious executable or script).
      • Processing of malicious files (e.g., malware, crafted documents to exploit parser vulnerabilities).
      • Denial of Service (DoS).
    • Risk Severity: High to Critical.
    • Mitigation Strategies:
      • Developer: Treat all data received via egui's drag-and-drop as completely untrusted. Validate file type, size, and content before any processing. Use appropriate security measures based on the expected data type (e.g., virus scanning, sandboxing, robust parsing libraries). Never directly execute or trust dropped data.
      • User: Be extremely cautious about dragging and dropping files from untrusted sources into any application.