Published:2021/05/21  Last Updated:2021/05/21

JVN#78254777
Installer of Overwolf may insecurely load Dynamic Link Libraries

Overview

The Overwolf Installer (Overwolf Ltd.) may insecurely load Dynamic Link Libraries.

Products Affected

  • The Installer of Overwolf 2.168.0.n and earlier

Description

Overwolf is a software framework for creating applications for games. The Overwolf Installer contains an issue with the DLL search path (CWE-427), which may lead to insecurely loading Dynamic Link Libraries stored in the same directory where the installer resides.

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 by the developer.
Also when executing the installer, be sure to check there are no suspicious files in the directory where the installer resides.

Vendor Status

Vendor Link
Overwolf Ltd. Development of gaming apps made easy

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

Shogo kumamaru of LAC Co., Ltd 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-2021-20726
JVN iPedia JVNDB-2021-000043