ctype_alpha($Username)) {$logined=false;}if(!is_numeric($password) ) {$logined=false;}if(md5($Username) !=md5($password)) {$logined=false;}if($logined){echo"successful";
md5绕过(Hash比较缺陷) <?php if (isset($_GET['Username']) && isset($_GET['password'])) { $logined = true; $Username = $_GET['Username']; $password = $_GET['password']; if (!ctype_alpha($Username)) {$logined = false;} if (!is_numeric($password) ) {$logined = false;}...
$v2 = $_GET['v2']; if (!ctype_alpha($v1)) {$logined = false;} if (!is_numeric($v2) ) {$logined = false;} if (md5($v1) != md5($v2)) {$logined = false;} if ($logined){ // continuue to do other things } else { echo "login failed" } } ? 这是一个ctf的题目...
示例代码 1:利用转为数字后相等的漏洞<?php if (isset($_GET['v1']) && isset($_GET['v2'])) { $logined = true; $v1 = $_GET['v1']; $v2 = $_GET['v2']; if (!ctype_alpha($v1)) {$logined = false;} if (!is_numeric($v2) ) {$logined = false;} if (md5($v1) !
ctype_alpha($Username)) {$logined = false;} if (!is_numeric($password) ) {$logined = false;} if (md5($Username) != md5($password)) {$logined = false;} if ($logined){ echo "successful"; }else{ echo "login failed!"; } } ?> 这一段代码的大致意思是输入一个数字和一个字符...
<?php $flag=""; $v1=$_GET['v1']; $v2=$_GET['v2']; if(isset($v1) && isset($v2)){ if(!ctype_alpha($v1)){ die("v1 error"); } if(!is_numeric($v2)){ die("v2 error"); } if(md5($v1)==md5($v2)){ echo $flag; } }else{ echo "where is flag?"; } ?> ...
无涯教程-PHP - ctype_alpha()函数 ctype_alpha() - 语法 ctype_alpha ( $text ); 1. 它检查提供的字符串text中的所有字符是否都是字母。 ctype_alpha() - 返回值 如果文本中的每个字符都是字母,则返回TRUE,否则返回FALSE。 ctype_alpha() - 示例...
if (ctype_alpha($testcase)) { echo"The string$testcaseconsists of all letters.\n"; } else { echo"The string$testcasedoes not consist of all letters.\n"; } } ?> 以上示例会输出: The string KjgWZC consists of all letters. The string arf12 does not consist of all letters. ...
if (!ctype_alpha($Username)) {echo”用户名不是字符串“;} if (!is_numeric($password) ) {echo”密码不是数字“;} {if (md5($Username) == md5($password)) {echo "flag{hh_xxx_}"} else{echo "请重试“;} } else{echo "请重试“;} ...
> if (!ctype\_alpha($Username)) {$logined = false;} > > if (!is\_numeric($password) ) {$logined = false;} > > if (md5($Username) != md5($password)) {$logined = false;} > > if ($logined){ > > echo "successful"; &...