[Japanese]

JVNDB-2018-009387

Mizuho Bank Mizuho Direct App for Android fails to verify SSL server certificates

Overview

Mizuho Bank Mizuho Direct App for Android fails to verify SSL server certificates.

Mizuho Bank Mizuho Direct App for Android provided by Mizuho Bank, Ltd. fails to verify SSL server certificates (CWE-295).

Reo Yoshida reported this vulnerability to JPCERT/CC.
JPCERT/CC coordinated with the developer.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 4.8 (Medium) [JPCERT/CC 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) [JPCERT/CC Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products


Mizuho Bank, Ltd.
  • Mizuho Direct App for Android version 3.13.0 and earlier

According to the developer, iOS version is not affected by this vulnerability.
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.
Vendor Information

Mizuho Bank, Ltd.
CWE (What is CWE?)

  1. Improper Certificate Validation(CWE-295) [JPCERT/CC Evaluation]
CVE (What is CVE?)

  1. CVE-2018-16179
References

  1. JVN : JVNVU#91640357
  2. National Vulnerability Database (NVD) : CVE-2018-16179
Revision History

  • [2018/11/19]
      Web page was published
  • [2019/08/27]
      References : Contents were added

Date Public2018/11/16
Date First Published2018/11/19
Date Last Updated2019/08/27