source: http://www.securityfocus.com/bid/6588/info

It has been reported that BitKeeper is vulnerable to an input validation bug. When the software is run in daemon mode, it starts a service with an interface that can be connected to via HTTP. By sending specially crafted input to the service, it is possible to execute abitrary commands. 

http://www.example.com:port/diffs/foo.c@%27;echo%20%3Eiwashere%27?nav=index.html|src/|hist/foo.c