Qkr! With MasterPass Man-In-The-Middle

Credit: David Coomber
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-295

CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

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

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