March 2023 – PwnDefend

Microsoft Outlook Elevation of Privilege Vulnerability (CVE-2023-23397)

Regarding: CVE-2023-23397

This is a fast publish, use at own risk.

See guidance from Microsoft: CVE-2023-23397 – Security Update Guide – Microsoft – Microsoft Outlook Elevation of Privilege Vulnerability

If you need to mitigate the latest Outlook vulnerability which abuses an SMB/WebDav call using the Calendar invite feature you can consider the following:

Education

The Long Game: Persistent Hash Theft

CVE-2023-23397 enables a threat actor to send a calendar invite whereby the properties of the msg file can include a path for the reminder sound file. This is achieved by setting:

Fiction

The Hacker on a Train

It was a crowded train ride during rush hour, and everyone was packed in like sardines. The train was slowly making its way through the city, and people were trying to kill time with their phones or laptops.

At one end of the train, there was a young man, who appeared to be in his mid-20s, typing away furiously on his laptop. He had a serious look on his face, and his eyes were focused on the screen.

Leadership

Adopting an Attacker Mindset to Defend Healthcare

This post started as a reply to a great topic on LinkedIn, but I hit the character limit so now it’s a blog post!

Years ago I simulated attacks (authorized obviously for the people that have wild imaginations) on a customer which included a physical attack where I walked into a healthcare organization, armed with a suit a smile (and a USB key) I needed to gain access and attempt to move laterally and escalate privileges.

Fiction

Caught: A Hacker Adventure

It was a dark and stormy night, and a lone figure sat hunched over their computer screen, typing away at lightning speed. This was no ordinary person – this was a hacker, one of the most skilled and dangerous in the world.

Education

Active Directory Enumeration with ChatGPT

I’ve not slept well for the last week and my brain is hurting, so I thought I would see if I can take our lovely new SKYNET overload AI “CHATGPT” and make it do all my work for me!

A common vulnerability in systems like Active Directory is where a system administrator writes a password in the description field. So the easy answer to this is DO NOT DO THIS. However during penetration testing we want to check. There’s tons of ways to do this but I thought I’d ask our AI roboto to help, so let’s see!

Defence

A Cyber Alarm – PoC Parrot

Ok About 4 months ago I made a quick PHP page to be used as a custom ALARM for detecting intruders in a network. This has a quick call to a Slack Web Hook but clearly could link to anything (.e.g. DISCORD, TEAMS etc.)

Today I wanted to deploy this but I thought I’d throw it into CHATGPT to see how it summarizes code:

So here we go:

Hacking

Active Directory Security Cheat Sheet

Ok you need to do some AD Security Auditing or Security Testing/Exploitation, great. Let’s look at some of the common misconfigurations and some tools to help you, a list of things will obviously not be the answer, you will need a method and process to go through from recon/enumeration through to exploitation and impact (effects), but that’s what google is for (and CTFs/Labs)! This post is just me jotting down some notes, hopefully they help defenders think about improving their posture.