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Attack Surface Analysis for herotransitions/hero

Attack Surface: Client-Side Cross-Site Scripting (XSS) via Configuration

Description: Injection of malicious JavaScript code into the web page, executed in the user's browser, by exploiting insecure handling of user-controlled configuration data used by hero.js.

Hero Contribution: hero.js relies on configuration options (e.g., element selectors, transition parameters) that, if derived from user input and not properly sanitized, can be used to manipulate the DOM in unintended ways, potentially injecting scripts.

Example: An attacker crafts a URL with malicious parameters that are used to configure hero.js. These parameters inject a <script> tag into the DOM during a transition, leading to XSS when hero.js processes this configuration. For instance, a URL like example.com/?heroConfig={"from": "<img src=x onerror=alert('XSS')>"} if improperly handled by the application and hero.js could inject the script.

Impact: Full compromise of the user's session, including stealing cookies, session tokens, redirecting to malicious sites, defacement, and further attacks against the user's system.

Risk Severity: High to Critical

Mitigation Strategies:

  • Input Sanitization: Strictly sanitize and validate all user-provided data before using it in hero.js configuration. Use appropriate escaping functions for HTML context.
  • Parameter Whitelisting: If possible, whitelist allowed configuration parameters and values instead of blacklisting.
  • Content Security Policy (CSP): Implement a strong CSP to restrict the sources from which scripts can be executed, reducing the impact of XSS.
  • Code Review: Regularly review code that handles hero.js configuration to identify potential injection points.

Attack Surface: Client-Side DOM-Based XSS through Transition Logic

Description: XSS vulnerability arising from flaws within the hero.js library's code itself, where it might mishandle or incorrectly process DOM elements during transitions, leading to script execution.

Hero Contribution: The internal logic of hero.js that manipulates the DOM to create transitions might contain vulnerabilities if it makes unsafe assumptions about the structure or content of the elements being transitioned.

Example: hero.js might parse attributes of elements during transitions without proper sanitization. If an attacker can inject malicious HTML attributes into elements that are later processed by hero.js, it could lead to DOM-based XSS. For example, if hero.js reads an attribute like data-hero-content and directly inserts it into another element without escaping, an attacker could inject <img src=x onerror=alert('XSS')> into this attribute.

Impact: Similar to configuration-based XSS, full compromise of the user's session, data theft, and malicious actions on behalf of the user.

Risk Severity: High to Critical (if vulnerabilities exist within hero.js itself).

Mitigation Strategies:

  • Library Updates: Keep hero.js updated to the latest version to benefit from security patches and bug fixes.
  • Security Audits of Hero.js (If Possible): If feasible, conduct or review security audits of the hero.js library itself to identify and report potential vulnerabilities to the maintainers.
  • CSP: As with configuration XSS, a strong CSP is crucial to mitigate the impact of DOM-based XSS.
  • Careful Integration: Thoroughly test the application's integration with hero.js to ensure no unexpected DOM manipulations create vulnerabilities.