Reported July 5, 2001, by Ken Pfeil.
Rhode Island Soft Systems’ 4th of July Fireworks demo screensaver for Windows 2000, Windows NT, and Windows 9x
A back door exists in the 4th of July Fireworks demo screensaver from Rhode Island Soft Systems. By pressing the space bar on the keyboard, it's possible to circumvent the screensaver's lock workstation function. A malicious user can make the default Web browser appear with the Rhode Island Soft System Web site by using the security context of the currently logged-on user. From there, the attacker can run explorer.exe in the browser’s address window to get the desktop and to run any other program under this context. A malicious user can also exploit this vulnerability remotely through Windows 2000 Terminal Services Advanced Client (formerly known as Terminal Services Web Client).
The vendor, Rhode Island Soft Systems, was notified about this vulnerability, but doesn't intend to release a fix for this issue. To work around this problem, a user can uninstall the demo screensaver software.
Discovered by Steve Johns.