The installer of e-Tax Software may insecurely load Dynamic Link Libraries


The installer of e-Tax Software provided by National Tax Agency contains an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries.

Yuji Tounai of NTT Communications Corporation 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 7.8 (High) [IPA Score]
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High
CVSS V2 Severity:
Base Metrics 6.8 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial
Affected Products

National Tax Agency JAPAN
  • e-Tax Software (installer)


This vulnerability can be exploited when the following condition is met. If this vulnerability is exploited, arbitrary code may be executed with the privilege of the user invoking the installer.

* A user is tricked into placing a malicious DLL file prepared by an attacker in a specific folder.

[Use the latest installer of e-Tax Software]
Users who are intended to install e-Tax Software for the first time or to upgrade the software, be sure to use the latest installer of e-Tax Software.
Vendor Information

National Tax Agency JAPAN
CWE (What is CWE?)

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

  1. CVE-2016-4901

  1. JVN : JVN#63012325
  2. National Vulnerability Database (NVD) : CVE-2016-4901
Revision History

  • [2016/10/19]
      Web page was published
      Solution was modified
      References : Content was added