Joe Vennix discovered that sudo, a program designed to provide limited
super user privileges to specific users, when configured to allow a user
to run commands as an arbitrary user via the ALL keyword in a Runas
specification, allows to run commands as root by specifying the user ID
- -1 or 4294967295. This could allow a user with sufficient sudo
privileges to run commands as root even if the Runas specification
explicitly disallows root access.