Currently starting solr fails if the user does not have permission to write to the current directory. This is caused by the resolve_java_vendor function writing a temporary file to the current directory (javares).
Rather than writing this temporary file to disk, The exit code of findstr can be used to determine if there is a match. (0 == match, 1 == no match, 2 == syntax error)
By not writing this temp file, you can reduce the permissions solr needs. As a work around until this is fixed, you can start solr in a directory that has the required permissions,