JVNDB-2017-000145

Installer of Setup file of advance preparation for e-Tax software (WEB version) may insecurely load Dynamic Link Libraries

Installer of Setup file of advance preparation for e-Tax software (WEB version) provided by National Tax Agency contains an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries.

BlackWingCat of Pink Flying Whale reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

National Tax Agency JAPAN

• e-Tax Software (WEB version) setup file of advance preparation (all versions distributed on the NTA website prior to 2018 January 4)

[Updated on 2018 January 9]
National Tax Agency released the update that contains a fix for this vulnerability on 2018 January 4. Therefore, the description of the affected versions was modified to "Setup file of advance preparation for e-Tax software (WEB version) all versions distributed on the NTA website prior to 2018 January 4".

Arbitrary code may be executed with the privilege of the user invoking the installer.

[Use the latest installer for the first-time installation or for updating the application]
Users who have downloaded and obtained "Setup file of advance preparation for e-Tax software (WEB version)" distributed on the NTA website prior to 2018 January 4, be sure to delete it.
When installing or updating "Setup file of advance preparation for e-Tax software (WEB version)", execute the installer by following the instructions below.

* Download the latest "Setup file of advance preparation for e-Tax software (WEB version)" released on 2018 January 4 from the NTA website.
* Check and see if there are no suspicious files in the folder where the installer resides before executing the installer.

Users who already have installed Setup file of advance preparation for e-Tax software (WEB version) do not need to re-install the application, because this issue affects the installer only.

National Tax Agency JAPAN

• National Tax Agency : How to use Setup file of advance preparation for e-Tax software (WEB version) -- Step (4) Setup file of advance preparation for e-Tax software (WEB version) (in Japanese)
• National Tax Agency : Steps and cautions when executing the installer (in Japanese)
• National Tax Agency : About the release of respective applications installers (in Japanese)

1. No Mapping(CWE-Other) [IPA Evaluation]

1. CVE-2017-2226

1. JVN : JVN#79451345
2. JVN : JVNTA#91240916
3. National Vulnerability Database (NVD) : CVE-2017-2226

• [2017/06/28]
    Web page was published
  [2017/07/05]
    Affected Products : Product version was modified
    Solution was modified
    Vendor Information : Content was added
  [2018/01/09]
    Affected Products : Product version was modified
    Solution was modified
    Vendor Information : Content was added
  [2018/02/07]
    References : Content was added