SEC Consult Vulnerability Lab Security Advisory < 20181116-0 > ======================================================================= title: Multiple critical vulnerabilities product: Miss Marple Enterprise Edition vulnerable version: <2.0 fixed version: 2.0 CVE number: CVE-2018-19233, CVE-2018-19234 impact: Critical homepage: www.comparex-group.com found: 2018-05-29 by: Marius Schwarz (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 IT company with thirty years of experience, COMPAREX is one of the worldas leading IT service providers and no. 1 software license management company in the EMEA markets. COMPAREX develops innovative services that support management and leverage software products, leading to an overall improvement of workforce productivity. COMPAREX serves corporate customers spanning from small businesses to large international corporations as well as the public institutions supporting every customer during their digital journey towards productivity optimization. The portfolio has a solid foundation in license management, software procurement and cloud services. Substantial professional and managed services complete the portfolio to support customers with services tailored to their business demands." Source: https://comparexusa.com/about-us/about/ Business recommendation: ------------------------ The vendor provides a patch and users of this product are urged to immediately upgrade to the latest version available. Vulnerability overview/description: ----------------------------------- Application overview: Miss Marple is an inventory software that consists of a client and a server part. The client (agent) is gathering system information and uploads the results to a remote server in an encrypted ZIP file. 1) Hardcoded AES key (CVE-2018-19233) A username and an encrypted password were identified in the Miss Marple Inventory Agent configuration file. By decompiling the binary, the encryption method was identified as AES-256 with a hardcoded key and initialization vector. The credentials are used to deploy the inventory files to a remote server. 2) Uploading arbitrary files There are two ways an attacker can upload arbitrary files to the server. 2.1) Patching the application binary to bypass the ZIP file extension check Using this method, it is possible to upload any file to the server, even if the credentials are unknown to the attacker! This works because every file in a specific directory gets uploaded, as long as the file has the correct file extension. This can be bypassed because the file extension is only checked on the client side and not on the server side. Patching the binary is done by replacing the extension string with the file extension of the attackers file eg. ".aspx" in the MMIA.exe binary itself. 2.2) Using cURL to upload arbitrary files If the credentials are known to the attacker, it is possible to use tools like cURL to upload arbitrary files to the remote server. Both ways can be used by an attacker to upload a web-shell to the server and execute arbitrary commands. 3) Missing update validation (CVE-2018-19234) Besides the Miss Marple Inventory Agent, an Miss Marple Updater Service is running on all clients. This service checks for new versions on the same server. If the files are uploaded to the right directory on the server, the updater will download and execute them with the highest privileges (NT Authority\SYSTEM) without validating the binaries. This can also be used for escalating privileges on the client. By uploading a web-shell using the methods described in vulnerability 2, an attacker gets sufficient write permissions to access the update directory and to place malicious files on the server. This will execute arbitrary code on all clients using Miss Marple. Proof of concept: ----------------- 1) Hardcoded AES key (CVE-2018-19233) No proof of concept will be provided. 2) Uploading arbitrary files 2.1) No proof of concept will be provided. E.g. the Unicode string for ".zip" just has to be replaced with the file extension for the uploaded web-shell. 2.2) Using cURL to upload arbitrary files It is possible to upload arbitrary files using cURL and the credentials obtained in 1). 3) Missing update validation (CVE-2018-19234) No proof of concept will be provided. Vulnerable / tested versions: ----------------------------- The following versions have been tested and found to be vulnerable: Miss Marple Inventory Agent / Miss Marple Updater Service 1.13 Vendor contact timeline: ------------------------ 2018-06-13: Contacting vendor through support-mmee@comparex.com 2018-07-04: Meeting with the vendor. Reviewed planned fixes. 2018-07-10: Meeting with the vendor. Release of fix dated to 2018-09-30 2018-09-16: Meeting with the vendor. Reviewed implemented fixes. 2018-10-11: Meeting with the vendor. Scheduled the roll-out for the fixed version. 2018-10-22: Vendor releases patched version. 2018-11-16: Public release of security advisory. Solution: --------- According to the vendor, all the identified issues have been fixed in version 2.0. Please update to the latest version immediately. 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 Marius Schwarz / @2018