Try Net::OpenSSH::Compat::SSH2 by salva. It's easier on your head and on your desk.

#!perl

use strict;
use warnings;
use Net::OpenSSH::Compat::SSH2;
use Net::SSH2;

my $ssh2 = Net::SSH2->new();
$ssh2->connect('host') or die "Unable to connect to host: $!\n";
$ssh2->auth_password('user', 'password');

my $chan = $ssh2->channel();
$chan->exec("ls");
print while <$chan>;
$chan->close;
$ssh2->disconnect();
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