Published:2017/11/02  Last Updated:2017/11/02

JVN#97243511
Installer of ”Flets Easy Setup Tool" may insecurely load Dynamic Link Libraries

Overview

Installer of "Flets Easy Setup Tool" provided by NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION may insecurely load Dynamic Link Libraries.

Products Affected

  • Flets Easy Setup Tool Ver1.2.0 and earlier

Description

Installer of "Flets Easy Setup Tool" provided by NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION contains an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries (CWE-427).

Impact

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

Solution

Use the latest installer
When installing "Flets Easy Setup Tool", use the latest installer according to the information provided by the developer.

Note that this vulnerability affects the installer only, thus users who have already installed "Flets Easy Setup Tool" do not need to re-install the software using the latest installer.  However if the older version of "Flets Easy Setup Tool" resides in your computer, delete it immediately.

For details, refer to the information provided by the developer.

Vendor Status

Vendor Status Last Update Vendor Notes
NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION Vulnerable 2017/11/02 NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION website

References

  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

CVSS v3 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base Score: 7.8
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)
CVSS v2 AV:N/AC:M/Au:N/C:P/I:P/A:P
Base Score: 6.8
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

Eili Masami of Tachibana Lab. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Alert
JPCERT Reports
CERT Advisory
CPNI Advisory
TRnotes
CVE CVE-2017-10825
JVN iPedia JVNDB-2017-000213