https://www.info-sec.ca/advisories/Qkr-MasterCard.html

Qkr! with MasterPass iOS Application - MITM SSL Certificate 
Vulnerability (CVE-2019-6702)

Overview

"Qkr! with MasterPass is the secure and easy way to order and pay for 
food and drinks from you iOS device.

With Qkr you can:

aC/ Discover Qkr merchants nearby.
aC/ Pre-order: Guests can order off the menu and pay ahead of time, then 
collect their order from a pick-up point or have it delivered to their 
seat or table
aC/ Create a free MasterPass account: Qkr uses MasterPass, MasterCardas 
secure digital wallet solution that accepts MasterCard, Visa, American 
Express and Discover Cards. The Apple Pay checkout option is coming 
later this year
aC/ Access your eReceipts: you can easily review your Qkr order history in 
the app or from emailed receipts.

Qkr is brought to you by MasterCard who processes 65,000 secure 
transactions a minute so you know that your transaction is safe. No card 
data is stored on your phone."

(https://itunes.apple.com/us/app/qkr-with-masterpass/id589799471)

Issue

The Qkr! with MasterPass iOS application (version 5.0.6 and below), does 
not validate the SSL certificate it receives when connecting to the 
application login server.

Impact

An attacker who can perform a man in the middle attack may present a 
bogus SSL certificate which the application will accept silently. 
Sensitive information could be captured by an attacker without the 
user's knowledge.

Timeline

October 26, 2016 - Notified MasterCard via security@mastercard.com
November 1, 2016 - Asked MasterCard to confirm that they received the 
vulnerability details
November 1, 2016 - MasterCard confirmed that they received the report 
and provided it to the Qkr! team for remediation
December 9, 2016 - Asked MasterCard if they have a release date for the 
new version
January 2, 2017 - Advised MasterCard that the version released on 
December 19th (5.0.8) resolves the issue
February 4, 2019 - Published an advisory to document the issue

Solution

Upgrade to version 5.0.8 or later

Acknowledgements

Thanks to the MasterCard Security team for their timely response