function onFinish() {
  this.eof();
  if (this.server || !this.allowHalfOpen)
    this.close();
  this.writable = false;
}
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.