Published:2018/02/13  Last Updated:2018/02/13

JVN#04564808
Installer of ”FLET'S Azukeru Backup Tool” may insecurely load Dynamic Link Libraries

Overview

Installer of "FLET'S Azukeru Backup Tool" provided by NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION may insecurely load Dynamic Link Libraries.

Products Affected

  • "FLET'S Azukeru Backup Tool" version 1.5.2.6 and earlier

Description

"FLET'S Azukeru Backup Tool" provided by NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION is software to automatically back up files in the user's computer to "FLET'S Azukeru" service.  Installer of "FLET'S Azukeru Backup Tool" 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
This vulnerability has been already addressed in the latest version(ver.1.5.2.7)released in 2017 May 11.
When installing "FLET'S Azukeru Backup Tool", use the latest installer according to the information provided by the developer.
If the old version of "FLET'S Azukeru Backup Tool" obtained from the website before 2017 May 11 resides in your computer, delete it immediately.

Note that this vulnerability affects the installer only, thus users who have already installed "FLET'S Azukeru Backup Tool" do not need to re-install the software using the latest installer. 

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

Vendor Status

Vendor Status Last Update Vendor Notes
NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION Vulnerable 2018/02/13 NIPPON TELEGRAPH AND TELEPHONE EAST 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-2018-0515
JVN iPedia JVNDB-2018-000012