Vulnerability Note VU#276408
Think Mutual Bank Mobile Banking App for iPhone fails to properly validate SSL certificates
Original Release date: 04 May 2017 | Last revised: 10 May 2017

Overview
Think Mutual Bank mobile banking app for iOS, version 3.1.5 and earlier, fails to properly validate SSL certificates provided by HTTPS connections, which may enable an attacker to conduct man-in-the-middle (MITM) attacks.

Description
CWE-295: Improper Certificate Validation – CVE-2017-3213
Think Mutual Bank mobile banking app for iOS fails to properly validate SSL certificates provided by HTTPS connections, which means that an attacker in the position to perform MITM attacks may be able to obtain sensitive account information such as login credentials.

Impact
An attacker on the same network as the iOS device may be able to view or modify network traffic that should have been protected by HTTPS, which may lead to the exposure of sensitive account information, including login credentials.

Solution
Apply an update

The vendor has released version 3.2.0 to address this issue. Users are encouraged to update to the latest release.
Do not use affected versions of the application

The features and services provided by the application are likely accessible via the Think Mutual Bank web site.

By using a web browser to access those resources, you may avoid situations where SSL is not validated.

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.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate UpdatedThink Mutual BankAffected-02 May 2017If you are a vendor and your product is affected, let
us know.

CVSS Metrics (Learn More)

Group
Score
Vector

Base
4.8
AV:A/AC:L/Au:N/C:P/I:P/A:N

Temporal
4.6
E:F/RL:U/RC:C

Environmental
4.5
CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND

References

http://cwe.mitre.org/data/definitions/295.html
https://www.thinkbank.com/apps/
https://www.thinkbank.com/index.php

Credit

Thanks to Will Strafach of verify.ly for reporting this vulnerability.
This document was written by Joel Land.

Other Information

CVE IDs:
CVE-2017-3213

Date Public:
04 May 2017

Date First Published:
04 May 2017

Date Last Updated:
10 May 2017

Document Revision:
13

FeedbackIf you have feedback, comments, or additional information about this vulnerability, please send us email.

Leave a Reply