Chrome Extension for e-Tax Reception System vulnerable to arbitrary command execution


Chrome Extension for e-Tax Reception System provided by National Tax Agency is an extension to use the e-Tax Reception System on Google Chrome and/or Chromium-based versions of Microsoft Edge. When a user runs a Chrome Extension for e-Tax Reception System, a specially crafted parameter by an attacker is fed to the Chrome Extension for e-Tax Reception and COM objects are manipulated, which may result in arbitrary command execution.

ucq of Cyber Defense Institute, Inc. 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 5.0 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: Low
CVSS V2 Severity:
Base Metrics 5.1 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial
Affected Products

National Tax Agency JAPAN
  • Chrome Extension e-Tax Reception System AP Ver1.0.0.0


A remote attacker may execute an arbitrary command.

[Update the Chrome Extension for e-Tax Reception System]
Update Chrome Extension for e-Tax Reception System to the latest version according to the information provided by the developer.
Vendor Information

National Tax Agency JAPAN
CWE (What is CWE?)

  1. Permissions(CWE-264) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2020-5601

  1. JVN : JVN#40039627
  2. National Vulnerability Database (NVD) : CVE-2020-5601
Revision History

  • [2020/06/24]
      Web page was published