JVN#18056666
Installer of MagicConnect Client program may insecurely load Dynamic Link Libraries
Overview
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
Description
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.
Impact
Arbitrary code may be executed with the privilege of the user invoking the installer.
Solution
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 |
References
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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
| 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) |
| 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) |
Comment
This analysis assumes that the user is tricked into placing a malicious DLL file prepared by an attacker in a specific folder.
Credit
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 Alert |
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| JPCERT Reports |
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| CERT Advisory |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2021-20674 |
| JVN iPedia |
JVNDB-2021-000020 |