: Directory Traversal (or Path Traversal) attack.
If you were to handle such a path in a programming language like Python, you might decode it and handle it like so: -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials
The server opens /var/log/app/../../../../home/ec2-user/.aws/credentials → /home/ec2-user/.aws/credentials → credentials are returned. : Directory Traversal (or Path Traversal) attack