[default] aws_access_key_id = AKIAIOSFODNN7EXAMPLE aws_secret_access_key = wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY Use code with caution.
@app.route('/download') def download(): filename = request.args.get('file') # Dangerous! No validation with open('/var/www/uploads/' + filename, 'r') as f: return f.read()
: Avoid storing static keys in .aws/credentials on servers. Instead, use IAM Roles for EC2 or ECS Task Roles , which provide temporary, auto-rotating credentials via the Instance Metadata Service (IMDS) .
Do not use aws configure to store access keys on production servers.
: Request the AWS credentials file. If successful, the server returns the contents of the file in the HTTP response.
Because web servers often filter or encode slashes, the attacker uses double-encoding ( %2F encoded as -2F or %252F ), or in this case, a custom encoding scheme that the backend incorrectly decodes. The string -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials might be part of a larger HTTP request:
Make sure to also decode URL‑encoded sequences.
The vulnerability is often found in endpoints that take a filename or path as a parameter, such as:
[default] aws_access_key_id = AKIAIOSFODNN7EXAMPLE aws_secret_access_key = wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY Use code with caution.
@app.route('/download') def download(): filename = request.args.get('file') # Dangerous! No validation with open('/var/www/uploads/' + filename, 'r') as f: return f.read()
: Avoid storing static keys in .aws/credentials on servers. Instead, use IAM Roles for EC2 or ECS Task Roles , which provide temporary, auto-rotating credentials via the Instance Metadata Service (IMDS) .
Do not use aws configure to store access keys on production servers.
: Request the AWS credentials file. If successful, the server returns the contents of the file in the HTTP response.
Because web servers often filter or encode slashes, the attacker uses double-encoding ( %2F encoded as -2F or %252F ), or in this case, a custom encoding scheme that the backend incorrectly decodes. The string -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials might be part of a larger HTTP request:
Make sure to also decode URL‑encoded sequences.
The vulnerability is often found in endpoints that take a filename or path as a parameter, such as:
