Published:2021/03/11  Last Updated:2021/03/11

Installer of MagicConnect Client program may insecurely load Dynamic Link Libraries


Installer of MagicConnect Client program provided by NTT TechnoCross Corporation may insecurely load Dynamic Link Libraries.

Products Affected

  • Installer of MagicConnect Client program which was distributed before 2021 March 1
As of 2021 March 1, the latest version is 7.0r2.


Installer of MagicConnect Client program provided by NTT TechnoCross Corporation contains a vulnerability which may lead to insecurely loading Dynamic Link Libraries (CWE-427) when a terminal is connected remotely using Remote desktop.


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


Use the latest installer
Use the latest installer provided after 2021 March 1.
Users who have obtained the installer of MagicConnect Client program before 2021 March 1 need to download the latest installer again for the installation.
Also when executing the installer, be sure to check there are no suspicious files in the directory where the installer resides.

Users who already have installed the software do not need to re-install, because this issue affects the installers only.

Vendor Status

Vendor Status Last Update Vendor Notes
NTT TechnoCross Corporation Vulnerable 2021/03/11 NTT TechnoCross Corporation website


  1. Japan Vulnerability Notes JVNTA#91240916
    Insecure DLL Loading and Command Execution Issues on Many Windows Application Programs

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Base Score: 7.0
Attack Vector(AV) Physical (P) Local (L) Adjacent (A) Network (N)
Attack Complexity(AC) High (H) Low (L)
Privileges Required(PR) High (H) Low (L) None (N)
User Interaction(UI) Required (R) None (N)
Scope(S) Unchanged (U) Changed (C)
Confidentiality Impact(C) None (N) Low (L) High (H)
Integrity Impact(I) None (N) Low (L) High (H)
Availability Impact(A) None (N) Low (L) High (H)
Base Score: 5.1
Access Vector(AV) Local (L) Adjacent Network (A) Network (N)
Access Complexity(AC) High (H) Medium (M) Low (L)
Authentication(Au) Multiple (M) Single (S) None (N)
Confidentiality Impact(C) None (N) Partial (P) Complete (C)
Integrity Impact(I) None (N) Partial (P) Complete (C)
Availability Impact(A) None (N) Partial (P) Complete (C)


This analysis assumes that the user is tricked into placing a malicious DLL file prepared by an attacker in a specific folder.


Yuji Tounai of Mitsui Bussan Secure Directions, Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2021-20674
JVN iPedia JVNDB-2021-000020