August 29th, 2019
MachineAccountQuota Transitive Quota: 110 Accounts and Beyond
Background If you aren’t familiar with MachineAccountQuota (MAQ), I recommend skimming my previous blog post on the subject. TLDR Active Directory (AD) tracks transitive accounts created through MAQ to limit the number of accounts that can be added from a single unprivileged source account. AD calculates the maximum using a formula of Q * (Q […]
July 9th, 2019
Collecting Contacts from zoominfo.com
For our client engagements, we are constantly searching for new methods of open source intelligence (OSINT) gathering. This post will specifically focus on targeting client contact collection from a site we have found to be very useful (zoominfo.com) and will describe some of the hurdles we needed to overcome to write automation around site scraping. […]
March 20th, 2019
Using Azure Automation Accounts to Access Key Vaults
This is the second post in a series of blogs that focuses around Azure Automation. Check out “Exporting Azure RunAs Certificates for Persistence” for more info on how authentication works for Automation Accounts. In this installment, we’re going to focus on making use of Automation Accounts to gain access to sensitive data stored in Key […]
March 6th, 2019
MachineAccountQuota is USEFUL Sometimes: Exploiting One of Active Directory’s Oddest Settings
MachineAccountQuota (MAQ) is a domain level attribute that by default permits unprivileged users to attach up to 10 computers to an Active Directory (AD) domain. My first run-in with MAQ was way back in my days as a network administrator on a new job. I was assigned the task of joining a remote location’s systems […]
February 27th, 2019
Get-AzurePasswords: Exporting Azure RunAs Certificates for Persistence
This post will be the first blog in a series that focuses around Azure Automation. I’ve recently run into a fair number of clients making use of Azure Automation Runbooks, and in many cases, the runbooks are being misconfigured. As attackers, these misconfigurations can provide us credentials, sensitive data, and some interesting points for escalation. […]
December 5th, 2018
ADIDNS Revisited – WPAD, GQBL, and More
A few months ago, I wrote a blog post on exploiting Active Directory-Integrated DNS (ADIDNS). This post will mainly cover some additional techniques on both the offensive and defensive fronts. I would suggest at least skimming the original post before continuing here. With that out of the way, I’d like to start by adding in […]
November 27th, 2018
Escape NodeJS Sandboxes
In this blog post, we’re going to explore how to escape NodeJS sandboxes by understanding the internals of the interpreter. NodeJS is a JavaScript runtime built on Chrome’s V8 JavaScript engine, allowing developers to use the same programming language, and possibly codebase, for the frontend and backend of an application. Initially released in 2009, NodeJS now […]
November 6th, 2018
Running PowerShell on Azure VMs at Scale
Let’s assume that you’re on a penetration test, where the Azure infrastructure is in scope (as it should be), and you have access to a domain account that happens to have “Contributor” rights on an Azure subscription. Contributor rights are typically harder to get, but we do see them frequently given out to developers, and […]
October 16th, 2018
XXE in IBM’s MaaS360 Platform
A couple of months ago I had the opportunity to test an implementation of MaaS360 – IBM’s MDM solution. The test was focused on device controls and the protection of corporate data, all things which the client had configured and none of which will be talked about here. Instead, during the course of the test […]