If you boot a virtual machine using the live CD image, you'll have a minimum system that includes a web server that loads a very simple page that displays system information:
If you look at the requests in a proxy, you'll notice one to /cgi-bin/status, whose response includes the system's uptime and what looks like the result of a uname -a command:
To get such information, the status script needs to communicate with the operating system. There is a chance that it is using bash for that, as bash is the default shell for ...