ThreatMetrix SDK for iOS fails to validate SSL certificates

Overview

On the iOS platform, the ThreatMetrix SDK versions prior to 3.2 fail to validate SSL certificates provided by HTTPS connections, which may allow an attacker to perform a man-in-the-middle (MITM) attack.

Description

ThreatMetrix is a security library for mobile applications, which aims to provide fraud prevention and device identity capabilities. The ThreatMetrix SDK versions prior to 3.2 do not validate SSL certificates on the iOS platform. An affected application will communicate with <https://h-sdk.online-metrix.net>, regardless of whether the connection is secure or not.

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Impact

An attacker on the same network as or upstream from the iOS device may be able to view or modify ThreatMetrix network traffic that should have been protected by HTTPS.

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Solution

Apply an update

This issue has been addressed in ThreatMetrix SDK versions 3.2 and later. Any iOS application that uses a vulnerable version of the ThreatMetrix SDK will need to be regenerated with an updated version of the library.

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Avoid untrusted networks

Avoid using untrusted networks, including public WiFi. Using your device on an untrusted network increases the chance of falling victim to a MITM attack.

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Vendor Information

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ThreatMetrix __ Affected

Notified: January 04, 2017 Updated: January 10, 2017

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The “lack of SSL certificate validation” issue was resolved in our SDK version 3.2 and subsequent versions of our SDK.

CVSS Metrics

Group	Score	Vector
Base	4.8	AV:A/AC:L/Au:N/C:P/I:P/A:N
Temporal	4	E:F/RL:OF/RC:C
Environmental	3.9	CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND

References

<https://www.threatmetrix.com/&gt;

Acknowledgements

This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

Other Information

CVE IDs:	CVE-2017-3182
Date Public:	2017-01-10 Date First Published: