Listen to this Post
POC: `https://www.shivang.com ///evil.cm /path/path`
You Should Know:
1. Understanding Open Redirect Vulnerabilities
Open Redirect vulnerabilities occur when a web application improperly validates user-supplied URLs, allowing attackers to redirect victims to malicious sites.
2. Exploiting Open Redirects
Attackers craft URLs like:
https://victim.com/redirect?url=https://evil.com
Or using obfuscation:
https://victim.com/redirect?url=///evil.com
3. Testing for Open Redirects
Use curl to test:
curl -I "https://example.com/redirect?url=http://malicious.com"
Check for HTTP 301/302 responses.
4. Bypassing Filters
Common bypass techniques:
- Double slashes: `///evil.com`
- URL encoding: `%2F%2Fevil.com`
- Subdomain tricks: `victim.com.evil.com`
5. Mitigation Techniques
- Whitelist allowed domains
- Use relative URLs
- Implement strict URL validation
Example in PHP:
$allowed_domains = ["trusted.com", "example.com"];
if (!in_array(parse_url($_GET['url'], PHP_URL_HOST), $allowed_domains)) {
die("Invalid redirect URL");
}
6. Real-World Impact
- Phishing attacks
- Malware distribution
- Session hijacking
What Undercode Say
Open Redirect flaws are often underestimated but can lead to severe security breaches. Always validate and sanitize URLs. Use Burp Suite or OWASP ZAP for automated testing.
Expected Output:
A secure web application that prevents unauthorized redirects by enforcing strict URL validation.
Prediction
Open Redirect vulnerabilities will remain prevalent due to lax input validation in web apps. Expect increased phishing campaigns leveraging such flaws.
URLs:
IT/Security Reporter URL:
Reported By: Shivangmauryaa Reward – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
