Published:2018/03/05  Last Updated:2018/03/05

JVN#01837169
Installer of WinShot may insecurely load Dynamic Link Libraries

Overview

Installer of WinShot provided by WoodyBells may insecurely load Dynamic Link Libraries.

Products Affected

  • WinShot 1.53a and earlier (Installer)

Description

Installer of WinShot 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 ZIP file format WinShot
When using WinShot, download the ZIP file version and use the software, according to the information provided by the developer. If the old installer version of WinShot obtained from the website before 2018 February 20 resides in your computer, delete it immediately.

Note that this vulnerability affects the installer only, thus users who have already installed WinShot do not need to re-install the software.

Vendor Status

Vendor Status Last Update Vendor Notes
WoodyBells Vulnerable 2018/03/05 WoodyBells 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-2018-0544
JVN iPedia JVNDB-2018-000021