OAuth Redirect URI Manipulation Scanner
Tests OAuth implementations for open redirect vulnerabilities.
What is OAuth Redirect URI Manipulation?
OAuth Redirect URI Manipulation attacks exploit weak validation of the redirect_uri parameter in OAuth flows. Attackers modify the redirect URI to steal authorization codes or access tokens by redirecting users to attacker-controlled pages after authentication, capturing the sensitive tokens in the URL.
Why is This Important?
A successful redirect URI attack steals OAuth tokens, giving attackers full access to user accounts on connected services. This affects login flows, API integrations, and mobile apps. Because users see legitimate login pages, they trust the flow and don't notice the token theft.
How It Works
1. Auth Flow Analysis
Maps authentication mechanisms including login, registration, password reset, and session management flows.
2. Security Testing
Tests for authentication bypasses, weak credentials, session flaws, and token vulnerabilities.
3. Access Verification
Validates findings by demonstrating unauthorized access or privilege escalation paths.
Key Capabilities
Comprehensive authentication security testing to protect user accounts and prevent unauthorized access.
- Complete authentication flow analysis
- Token and session security validation
- Password policy and brute-force testing
- Multi-factor authentication bypass detection
- OAuth, SAML, and JWT security assessment
Frequently Asked Questions
How does redirect URI manipulation work?
The attacker crafts a malicious authorization URL with a modified redirect_uri pointing to their server. The user authenticates normally, then gets redirected to the attacker's page with the authorization code or token in the URL. The attacker exchanges this for account access.
What bypass techniques exist for URI validation?
Common bypasses: subdomain manipulation (evil.legitimate.com), path traversal (legitimate.com/callback/../evil), parameter pollution, open redirects on legitimate domains, localhost variants (127.0.0.1, [::1]), URL encoding, and Unicode normalization attacks.
Is strict redirect URI matching enough?
Strict matching helps but isn't complete protection. Attackers can exploit: open redirects on the legitimate redirect domain, fragment-based attacks (#token), referrer leakage, and browser bugs. Defense in depth with state validation and short-lived codes is essential.
How do I secure OAuth redirect URIs?
Use exact string matching for redirect URIs, require pre-registration of all redirect URIs, never use pattern matching or wildcards, validate URIs on both authorization and token endpoints, use PKCE for public clients, and implement short-lived authorization codes.
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