How I Took Over An Instagram Account Using Broken Link Hijacking & Found Open Redirections

You Should Know:

1. Broken Link Hijacking

Broken Link Hijacking occurs when an attacker exploits a broken or outdated link to gain unauthorized access or redirect users to malicious sites. Here’s how you can identify and test for broken links using Python:

import requests

def check_broken_links(url):
try:
response = requests.get(url)
if response.status_code == 404:
print(f"Broken link found: {url}")
else:
print(f"Link is valid: {url}")
except requests.exceptions.RequestException as e:
print(f"Error checking {url}: {e}")

<h1>Example usage</h1>

check_broken_links("https://example.com/old-link")

2. Open Redirections

Open redirections occur when a web application redirects users to a URL specified in a parameter without proper validation. Test for open redirections using curl:

curl -I "https://example.com/redirect?url=https://malicious-site.com"

Look for the `Location` header in the response to confirm if the redirection is open.

3. Instagram Account Takeover

To secure your Instagram account, use the following commands to check for suspicious activities:

Linux Command to Monitor Network Traffic:
```
sudo tcpdump -i eth0 -n port 443
```
Windows Command to Check Active Connections:
```
netstat -an | find "ESTABLISHED"
```

4. Preventive Measures

Use strong, unique passwords and enable two-factor authentication (2FA).
Regularly audit your website for broken links and open redirections.
Implement proper input validation and sanitization in your web applications.

What Undercode Say:

Broken Link Hijacking and Open Redirections are critical vulnerabilities that can lead to account takeovers and phishing attacks. Always validate and sanitize user inputs, monitor your network for suspicious activities, and regularly audit your web applications. Use tools like tcpdump, curl, and custom scripts to identify and mitigate these risks. Stay vigilant and proactive in securing your digital assets.