A malicious or compromised SCP server could return file or directory names containing
path separators, drive qualifiers, or parent-directory references.
ScpClient.Download(string, DirectoryInfo) combined these into a local path without
validation, allowing writes outside the destination directory. Server-supplied C and D
record names are now validated before being combined into a local path.
Signed-off-by: Nadav0077 <18245584+Nadav0077@users.noreply.github.com>
Nadav0077