Published:2016/05/18  Last Updated:2016/05/18

JVN#11877654
百五銀行 (105 BANK) App fails to verify SSL server certificates

Overview

百五銀行 (105 BANK) App fails to verify SSL server certificates.

Products Affected

  • 百五銀行 for Android version 1.1, 1.0
  • 百五銀行 for iOS version 1.0

Description

百五銀行 (105 BANK) App provided by THE HYAKUGO BANK, LTD. is a mobile app for internet banking. 百五銀行 App fails to verify SSL server certificates.

Impact

A man-in-the-middle attack may allow an attacker to eavesdrop on an encrypted communication.

Solution

Update the Application
Update to the latest version according to the information provided by the developer.
Note that updating is necessary to access any services being provided by the application.

Vendor Status

Vendor Status Last Update Vendor Notes
THE HYAKUGO BANK, LTD. Vulnerable 2016/05/18 THE HYAKUGO BANK, LTD. website

References

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

CVSS v3 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Base Score: 4.8
Attack Vector(AV) Physical (P) Local (L) Adjacent (A) Network (N)
Attack Complexity(AC) High (H) Low (L)
Privileges Required(PR) High (H) Low (L) None (N)
User Interaction(UI) Required (R) None (N)
Scope(S) Unchanged (U) Changed (C)
Confidentiality Impact(C) None (N) Low (L) High (H)
Integrity Impact(I) None (N) Low (L) High (H)
Availability Impact(A) None (N) Low (L) High (H)
CVSS v2 AV:N/AC:H/Au:N/C:P/I:P/A:N
Base Score: 4.0
Access Vector(AV) Local (L) Adjacent Network (A) Network (N)
Access Complexity(AC) High (H) Medium (M) Low (L)
Authentication(Au) Multiple (M) Single (S) None (N)
Confidentiality Impact(C) None (N) Partial (P) Complete (C)
Integrity Impact(I) None (N) Partial (P) Complete (C)
Availability Impact(A) None (N) Partial (P) Complete (C)

Comment

This analysis assumes a man-in-the-middle attack being conducted by an attacker that places a malicious wireless LAN access point.

Credit

Yuji Tounai of NTT Com Security (Japan) KK reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Alert
JPCERT Reports
CERT Advisory
CPNI Advisory
TRnotes
CVE CVE-2016-1210
JVN iPedia JVNDB-2016-000065