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
-
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
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 |