Tokyo Star bank App fails to verify SSL server certificates


Tokyo Star bank App provided by The Tokyo Star Bank, Limited fails to verify SSL server certificates.

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.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 4.8 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.0 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

The Tokyo Star Bank, Limited
  • Tokyo Star Bank App for Android version 1.3 and earlier
  • Tokyo Star Bank App for iOS version 1.3 and earlier


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

[Update the Software]
Update to the latest version according to the information provided by the developer.
Vendor Information

The Tokyo Star Bank, Limited
CWE (What is CWE?)

  1. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2016-1184

  1. JVN : JVN#00272277
  2. National Vulnerability Database (NVD) : CVE-2016-1184
Revision History

  • [2016/04/13]
      Web page was published
      References : Content was added