Rapid7’s Windows InsightIDR Agent: Local Privilege Escalation

[Florian Bogner <florian@xxxxxxxxxxxxxxxxx>]

Local Privilege Escalation in Rapid7’s Windows Insight IDR Agent

Metadata
===================================================
Release Date: 03-Jun-2019
Author: Florian Bogner @ https://bee-itsecurity.at
Affected product:  Rapid7’s Insight Agent v2.6.3.14 and earlier for Windows
Fixed in: version 2.6.5
Tested on: Windows 10 x64 fully patched
CVE:  CVE-2019-5629
URL: 
https://bogner.sh/2019/06/local-privilege-escalation-in-rapid7s-windows-insight-idr-agent/
Vulnerability Status: Fixed with new release

Product Description
===================================================
Rapid7’s InsightIDR is your security center for incident detection and 
response, authentication monitoring, and endpoint visibility. InsightIDR 
identifies unauthorized access from external and internal threats and 
highlights suspicious activity so you don’t have to weed through thousands of 
data streams. [https://insightidr.help.rapid7.com/docs]

Vulnerability Description
===================================================
While trying to disable the InsightIDR Agent during one of my assignments (so 
that I could stay under the radar), I discovered a privilege escalation 
vulnerability in its Windows service. This vulnerability could be abused by any 
local user to gain full control over the affected system. It has been verified 
on a fully patched German Windows 10 x64 running Insight Agent v2.6.3.14. The 
issue has been fixed with version 2.6.5.

The underlying vulnerability was that the ir_agent Windows Service, which is 
automatically started on system boot and runs with SYSTEM privileges, tries to 
load the DLL C:\DLLs\python3.dll. This causes a local privilege escalation from 
authenticated user to SYSTEM.

A full vulnerability description is available here: 
https://bogner.sh/2019/06/local-privilege-escalation-in-rapid7s-windows-insight-idr-agent/

Suggested Solution
===================================================
End-users should update to the latest available version.

Disclosure Timeline
===================================================
22.5.2019: The issue has been identified, documented and reported
22.5.2019: The vulnerability has been confirmed by Rapid7
29.5.2019: Rapid7 released a new version (2.6.5) of the Insight agent that 
fixes this vulnerability. CVE-2019-5629 has been assigned.
03.6.2019: Public disclosure

PoC
===================================================
A working PoC is available here: 
https://bogner.sh/2019/06/local-privilege-escalation-in-rapid7s-windows-insight-idr-agent/

___________

Florian Bogner
Information Security Expert, Speaker

Bee IT Security Consulting e.U.
Nibelungenstraße 37
3123 A-Schweinern

Tel: +43 660 123 9 454
Mail: florian@xxxxxxxxxxxxxxxxx
Web: https://www.bee-itsecurity.at