JVN#79451345: 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.

Impact

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

Solution

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.

Products Affected

• Setup file of advance preparation for e-Tax software (WEB version) all versions distributed on the NTA website prior to 2018 January 4
  【Updated on 2017 July 5】
  This advisory was first published on 2017 June 26. At that point it was stated that the affected product was version 1.17.0, and updating to version 1.17.1 was the solution. However on 2017 July 3, it was confirmed the fix for this vulnerability incorporated in version 1.17.1 was not complete and the reported vulnerability still exists.
  Therefore, the description of the affected versions was modified to “1.17.1 and earlier”.

【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”.