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


"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:

• Discover Qkr merchants nearby.
• 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
• Create a free MasterPass account: Qkr uses MasterPass, MasterCard’s secure digital wallet solution that accepts MasterCard, Visa, American Express and Discover Cards. The Apple Pay checkout option is coming later this year
• 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."



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.


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.


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


Upgrade to version 5.0.8 or later


Thanks to the MasterCard Security team for their timely response




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