[FD] RENPHO iOS missing encryption and integrity check

[ProSec Security Team <security@xxxxxxxxxxxxxxxxxxx>]

Hello together, 

we’ve found the following vulnerability below. 

Affected software: RENPHO V3.0.0 (iOS App)
Vulnerability type: Missing Encryption and Integrity Check of Sensitive Data
Vulnerable version: Renpho Mobile Application V3.0.0 for iOS
Vulnerable component: Client app, transmitting data to server backend
Vendor report confidence: Unconfirmed
Fixed version: -
Vendor notification: 13/08/19
Solution date:
CVE reference: CVE-2019-14808
CVSSv3 Score: 6.8  AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Researcher Credits: Tim Schughart, Christian Horn
Communication Timeline: 
13th August 2019 Initial contact - no response
26th September second contact attempt - no response 
08th October fulldisclosure 

Vulnerability Details:
The client application (mobile app for iOS) transmits data unencrypted
to an server in JSON without integrity check, if an user changes
personal data in his profile tab oder logs hisself in his account.

Proof of concept:
Caputre traffice via proxy or MITM attack, while user logs in or changes his 
user profile. You are able to catch session id for cloning, password in 
cleartext oder change data on the fly, because of an missing integrity check. 


Best regards / Mit freundlichen Grüßen 

Dr. h.c. Tim Schughart 
CEO / Geschäftsführer  

--
ProSec GmbH
Robert-Koch-Straße 1-9
56751 Polch 

Website: https://www.prosec-networks.com 
E-Mail: info@xxxxxxxxxxxxxxxxxxx 
Phone: +49 (0)261 450 930 90

Sitz der Gesellschaft / Company domiciled in: Polch
Registergericht / registry Court: Amtsgericht Koblenz, HRB 26457
Geschäftsführer: Tim Schughart
UST-IdNr./ VAT ID: DE321817516


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