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Unrestricted File Upload Vulnerability

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Description and Impact: File uploads pose significant risk to applications
Attackers can execute code through file uploads
Consequences range from system takeover to client-side attacks
Vulnerability affects both server and client sides
Technical Aspects: Problems arise from file metadata like paths and names
File size and content can be misused for attacks
Attackers can bypass file extension restrictions
Content-type header validation can be exploited
Security Risks: Malicious files can execute on victim's machines
Files can trigger vulnerabilities in client and server libraries
Sensitive files may be accessible to unauthorized users
File uploaders can disclose internal server information
Prevention Measures: Restrict file types to necessary business functionality
Validate file names and extensions carefully
Limit file size and filename length
Use POST method instead of PUT/GET
Implement cross-site request forgery protection
Disable browser caching for cross-domain policy files