ManageEngine OpManager Privilege Escalation


Vendor: Zoho Corporation Pvt. Ltd.
Product web page: https://www.manageengine.com
Affected version: 12.3

Summary: OpManager offers comprehensive network monitoring capabilities
that help you monitor network performance, detect network faults in real
time, troubleshoot errors, and prevent downtime. Being a powerful network
monitor, it supports multi-vendor IT environments and can scale to fit your
network, regardless of its size. Monitor your devices and network to gain
complete visibility and control over your entire network infrastructure.
It allows you to monitor critical performance metrics like availability,
CPU, disk space, and memory utilization across physical and virtual servers.

Description:  The OpManager Monitoring service suffers from a weak permissions
issue in which an attacker can replace the service binary with a binary of his
choice. This service runs as Localsystem thus allowing for a privilege escalation
vector.

Tested on: Microsoft Windows 7 x64


Vulnerability discovered by Humberto Cabrera
                            @zeroscience


Advisory ID: ZSL-2019-5504
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5504.php

14.01.2019

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C:\Users\User>sc qc opmanager
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: opmanager
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\ManageEngine\OpManager\bin\wrapper.exe -s C:\ManageEngine\OpManager\conf\wrapper.conf
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : ManageEngine OpManager
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem


C:\ManageEngine\OpManager\bin>icacls wrapper.exe
wrapper.exe BUILTIN\Administrators:(I)(F)
            NT AUTHORITY\SYSTEM:(I)(F)
            BUILTIN\Users:(I)(RX)
            NT AUTHORITY\Authenticated Users:(I)(M)    <==- Weak Permissions allowing the modification of the service binary