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U by BB&T iOS banking application fails to properly validate SSL certificates

Vulnerability Note VU#338624

Original Release Date: 2016-09-30 | Last Revised: 2016-10-10


U by BB&T for iOS, version 1.5.4 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.


CWE-295: Improper Certificate Validation - CVE-2016-6550

U by BB&T is a banking application. On iOS devices, the app 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.


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.


Update the app to the latest version

Version 1.5.5 appears to have addressed the issue.

Do not use affected versions of the application

The features and services provided by the application are likely accessible via the BB&T banking 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


BB&T Bank Affected

Notified:  August 16, 2016 Updated: September 22, 2016



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group Score Vector
Base 7.8 AV:A/AC:L/Au:N/C:C/I:C/A:N
Temporal 7 E:F/RL:W/RC:C
Environmental 1.8 CDP:ND/TD:L/CR:ND/IR:ND/AR:ND



Thanks to the reporter who wishes to remain anonymous.

This document was written by Joel Land.

Other Information

CVE IDs: CVE-2016-6550
Date Public: 2016-09-30
Date First Published: 2016-09-30
Date Last Updated: 2016-10-10 14:58 UTC
Document Revision: 30

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