So I recently found wepbuster, and have been trying to get it working with the Backtrack 4 Pre Release (or is it Pre-Final? ..).

BT4 doesn’t seem to come with all the right perl modules installed.  These errors were easily “fixed” by simply installing the requested packages.

root@bt4-pre-release:~/src/wepbuster-1.0_beta$ ./wepbuster
Can’t locate Number/Range.pm in @INC (@INC contains: /etc/perl /usr/local/lib/pe                                                    rl/5.10.0 /usr/local/share/perl/5.10.0 /usr/lib/perl5 /usr/share/perl5 /usr/lib/                                                    perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl .) at ./wepbuster line 8                                                    .
BEGIN failed–compilation aborted at ./wepbuster line 8.

root@bt4-pre-release:~/src/wepbuster-1.0_beta$ ./wepbuster
Can’t locate Algorithm/Permute.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.10.0 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl .) at ./wepbuster line 9.
BEGIN failed–compilation aborted at ./wepbuster line 9.

Wepbuster thread over at remote-exploit.org forums

backtrack, backtrack 4, backtrack 4 pre final, backtrack 4 pre release, bt4, bt4-pre-final, bt4-pre-release, perl, wep, wepbuster Hide