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Attack Tree Analysis for go-chi/chi

Objective: To achieve unauthorized access to application resources or functionality, or to cause a denial-of-service (DoS) condition, specifically by exploiting vulnerabilities or misconfigurations related to the chi router.

Attack Tree Visualization

                                      [Attacker's Goal: Unauthorized Access/DoS via Chi]
                                                    |
                      =========================================================================
                      ||
        [[Exploit Chi-Specific Middleware Vulnerabilities]]
                      ||
        ==============================
        ||             ||              ||
[Bypass    [Improper  [[Vulnerable
Middleware]  Error      Custom
            Handling]  Middleware]]
            ||
            ||
    [Medium Risk]
                                                ||
                                                =====================================
                                                ||                   ||                 ||
                                        [Wildcard                 [[Regex          [[Parameter
                                         Matching                  DoS (ReDoS)]]    Injection]]
                                         Issues]
                                         [Medium Risk]

Attack Tree Path: Exploit Chi-Specific Middleware Vulnerabilities

  • Description: This is the overarching critical node representing vulnerabilities within middleware used with chi. Middleware intercepts HTTP requests and can perform actions like authentication, authorization, logging, and request modification. Flaws in middleware can have a significant impact because they affect all requests passing through them.
  • Likelihood: High (Especially with custom middleware)
  • Impact: High to Very High
  • Effort: Low to Medium
  • Skill Level: Beginner to Advanced
  • Detection Difficulty: Medium to Hard

Attack Tree Path: Bypass Middleware

  • Description: An attacker crafts a request that circumvents intended middleware checks. This could involve manipulating the URL path, headers, or other request parameters to avoid triggering the middleware or to cause it to behave unexpectedly.
  • Likelihood: Medium
  • Impact: High to Very High
  • Effort: Low to Medium
  • Skill Level: Beginner to Intermediate
  • Detection Difficulty: Medium to Hard

Attack Tree Path: Improper Error Handling in Middleware

  • Description: Middleware fails to handle errors correctly, potentially leaking sensitive information in error responses or allowing requests to proceed when they should be blocked.
  • Likelihood: Medium
  • Impact: Low to High
  • Effort: Low
  • Skill Level: Beginner
  • Detection Difficulty: Easy to Medium

Attack Tree Path: Vulnerable Custom Middleware

  • Description: Custom-written middleware contains vulnerabilities such as SQL injection, cross-site scripting (XSS), command injection, or other flaws that an attacker can exploit. This is the most likely source of serious vulnerabilities.
  • Likelihood: High
  • Impact: Low to Very High
  • Effort: Low to High
  • Skill Level: Beginner to Advanced
  • Detection Difficulty: Medium to Hard

Attack Tree Path: Wildcard Matching Issues

  • Description: Overly broad wildcard patterns in routes (e.g., /{param:.+}) can be abused by sending requests with very long or complex parameter values, leading to high CPU or memory usage.
  • Likelihood: Medium
  • Impact: Medium to High
  • Effort: Low
  • Skill Level: Beginner
  • Detection Difficulty: Easy

Attack Tree Path: Regex DoS (ReDoS)

  • Description: If regular expressions used in routing (or in middleware handling route parameters) are vulnerable to ReDoS, an attacker can craft a request that causes the regex engine to consume excessive CPU time, leading to a denial-of-service.
  • Likelihood: Low to Medium
  • Impact: Medium to High
  • Effort: Low to Medium
  • Skill Level: Intermediate
  • Detection Difficulty: Easy to Medium

Attack Tree Path: Parameter Injection

  • Description: A handler uses a route parameter directly in a security-sensitive operation (e.g., SQL query, shell command) without proper sanitization or validation. This allows an attacker to inject malicious code, leading to SQL injection, command injection, or other injection attacks. This is a vulnerability in the handler, but it's enabled by chi providing the parameter.
  • Likelihood: Medium
  • Impact: High to Very High
  • Effort: Low to Medium
  • Skill Level: Beginner to Advanced
  • Detection Difficulty: Medium to Hard