Sperl
A special version of Perl that works around a vulnerability in the setuid and
setgid scripts.
On some systems, setuid and setgid scripts (scripts written in the C shell,
Bourne shell, or Perl, for example, with the set user or group ID permissions
enabled) are insecure due to a race condition in the kernel. For those systems,
Perl versions 4 and 5 attempt to work around this vulnerability with a special
program named suidperl, also known as sperl. Even on systems that do provide a
secure mechanism for setuid and setgid scripts, suidperl may also be installedùalthough it is not needed.