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Epic Games Launcher 7.9.4-4058369 Insecure File Permissions

Epic Games Launcher 7.9.4-4058369 Insecure File Permissions
Posted May 22, 2018
Authored by LiquidWorm | Site zeroscience.mk

Epic Games Launcher version 7.9.4-4058369 suffers from an insecure file permissions vulnerability.

tags | exploit
SHA-256 | 35af3e355a869f4fe36fe821e7896477dc9771a67740fc68f1b82e8653dc2005

Epic Games Launcher 7.9.4-4058369 Insecure File Permissions

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Epic Games Launcher 7.9.4-4058369 Insecure File Permissions


Vendor: Epic Games, Inc.
Product web page: https://www.epicgames.com
Affected version: 7.9.4-4058369
7.9.3-4051644
7.9.2
7.9.1-4016505
7.8.0-3988049
7.7.0


Summary: Epic Games Launcher is a shareware desktop tool that
allows you to buy and download games and other products from
Epic Games. Through this program, you can get games like Fortnite,
Unreal Tournament, Shadow Complex, and Paragon. Also, you can
download tools like Unreal Engine and ARK Dev Kit. The program
includes a social feature that allows you to add friends, change
your status, and more.

Desc: The Epic Games Launcher suffers from an elevation
of privileges vulnerability which can be used by a simple
authenticated user that can change the executable file
with a binary of choice. The vulnerability exist due to
the improper permissions, with the 'F' flag (Full) for
'Users' group.

Tested on: Microsoft Windows 10 Home


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Advisory ID: ZSL-2018-5468
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2018-5468.php


10.04.2018

--


C:\Program Files (x86)\Epic Games\Launcher\Engine\Binaries\Win64>icacls EpicGamesLauncher.exe
EpicGamesLauncher.exe BUILTIN\Users:(I)(F)
NT AUTHORITY\SYSTEM:(I)(F)
BUILTIN\Administrators:(I)(F)
APPLICATION PACKAGE AUTHORITY\ALL APPLICATION PACKAGES:(I)(RX)
APPLICATION PACKAGE AUTHORITY\ALL RESTRICTED APPLICATION PACKAGES:(I)(RX)

Successfully processed 1 files; Failed processing 0 files

C:\Program Files (x86)\Epic Games\Launcher\Engine\Binaries\Win64>


----------------------


C:\Program Files (x86)\Epic Games>cacls Launcher
C:\Program Files (x86)\Epic Games\Launcher BUILTIN\Users:(OI)(CI)(ID)F
NT SERVICE\TrustedInstaller:(ID)F
NT SERVICE\TrustedInstaller:(CI)(IO)(ID)F
NT AUTHORITY\SYSTEM:(ID)F
NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Administrators:(OI)(CI)(IO)(ID)F
BUILTIN\Users:(OI)(CI)(IO)(ID)(special access:)
GENERIC_READ
GENERIC_EXECUTE

CREATOR OWNER:(OI)(CI)(IO)(ID)F
APPLICATION PACKAGE AUTHORITY\ALL APPLICATION PACKAGES:(ID)R
APPLICATION PACKAGE AUTHORITY\ALL APPLICATION PACKAGES:(OI)(CI)(IO)(ID)(special access:)
GENERIC_READ
GENERIC_EXECUTE

APPLICATION PACKAGE AUTHORITY\ALL RESTRICTED APPLICATION PACKAGES:(ID)R
APPLICATION PACKAGE AUTHORITY\ALL RESTRICTED APPLICATION PACKAGES:(OI)(CI)(IO)(ID)(special access:)
GENERIC_READ
GENERIC_EXECUTE
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