          accept = function() {
            if (replied)
              return;

            replied = true;

            stream.channelOpenConfirm(info.sender,
                                      localChan,
                                      Channel.MAX_WINDOW,
                                      Channel.PACKET_SIZE);

            return new Session(self, info, localChan);
          };
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.