Broken Authentication in Phoenix
How Broken Authentication Manifests in Phoenix
Broken Authentication in Phoenix applications typically stems from improper session management, weak credential handling, and misconfigured authentication flows. Phoenix's plug-based architecture creates specific attack surfaces that differ from other frameworks.
One common vulnerability occurs in Phoenix session handling. When developers use Phoenix.Token without proper salt values or expiration times, attackers can exploit predictable token generation. Consider this flawed implementation:
Phoenix-Specific Detection
Detecting broken authentication in Phoenix applications requires examining both configuration files and runtime behavior. middleBrick's Phoenix-specific scanning identifies these vulnerabilities through black-box testing of your API endpoints.
middleBrick tests Phoenix authentication by attempting to access protected endpoints without credentials. It identifies endpoints that should require authentication but don't enforce it:
Phoenix-Specific Remediation
Fixing broken authentication in Phoenix requires leveraging the framework's built-in security features while following Elixir best practices. Here's how to remediate the vulnerabilities identified in the previous sections.
For secure token generation, use unique salts per application and implement proper expiration:
Related CWEs: authentication
CWE ID Name Severity CWE-287 Improper Authentication CRITICAL CWE-306 Missing Authentication for Critical Function CRITICAL CWE-307 Brute Force HIGH CWE-308 Single-Factor Authentication MEDIUM CWE-309 Use of Password System for Primary Authentication MEDIUM CWE-347 Improper Verification of Cryptographic Signature HIGH CWE-384 Session Fixation HIGH CWE-521 Weak Password Requirements MEDIUM CWE-613 Insufficient Session Expiration MEDIUM CWE-640 Weak Password Recovery HIGH
Frequently Asked Questions
How does Phoenix's session management differ from other frameworks regarding broken authentication?
Phoenix uses cookie-based sessions by default with server-side storage, making it vulnerable to session fixation if developers don't regenerate session IDs after login. Unlike frameworks with built-in session rotation, Phoenix requires explicit calls to regenerate_session() in authentication controllers. The framework's plug-based architecture also means authentication must be carefully applied to all routes, as missing plugs create authentication bypasses specific to Phoenix's routing structure.Can middleBrick detect Phoenix-specific authentication vulnerabilities in my application?
Yes, middleBrick's Phoenix-specific scanning identifies vulnerabilities unique to the framework. It tests for predictable Phoenix.Token salts, Guardian JWT misconfigurations, missing channel authorization, and session fixation vulnerabilities. The scanner examines your API's authentication patterns and identifies Phoenix-specific attack vectors like unprotected LiveView endpoints and misconfigured channel joins that other scanners might miss.