Think Mutual Bank Mobile Banking App for iPhone fails to properly validate SSL certificates

2017-05-04T00:00:00
ID VU:276408
Type cert
Reporter CERT
Modified 2017-05-10T00:00:00

Description

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

Vendor| Status| Date Notified| Date Updated
---|---|---|---
Think Mutual Bank| | -| 02 May 2017
If you are a vendor and your product is affected, let us know.

CVSS Metrics

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