Getting RCE via Worst Fit 🤦

If you watched the Black Hat talk from Orange Tsai and Splitline last week in London, you might have found yourself shocked to see that a code snippet like the one below can lead to RCE.

Why can this be hacked? 🤔

Well, because you can inject double quotes... But can you? Not really, because 'subprocess.run()' would handle them securely. What you can do instead though is inject the odd fullwidth quotation mark: ＂

This shouldn't be a problem because surely shells wouldn't interpret this, right?

Wrong. Since Windows historically stores a lot of things, like cmdlines, environment variables, etc., in both ANSI and UTF-16, we run into a problem... How can you represent a value in ANSI if that value doesn't actually exist in the character set?

Meet "Best Fit". Which converts certain UTF-16 characters to similar-looking ANSI characters (such as converting a ∞ to an 8. Or converting a ¥ to a backslash. Or converting a ＂to a normal double quote).

This means that you can pwn this code snippet by injecting something like:

＂ --use-askpass=calc ＂

This pops calculator.

If you want to play around a bit with this, you may want to check out this PoC that I've created: https://lnkd.in/dBgeFscq

Also, you may want to check out https://worst[.]fit/ which tracks a list of Windows binaries vulnerable to this attack.

The worst part? Microsoft says this isn't a Windows vulnerability while open-source library maintainers say it is. So who is gonna fix it? 🤷‍♂️

Ref: Florian Walter
@UndercodeCommunity
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5- Malware Traffic Analysis with Wireshark: lnkd.in/g5Ze-iwU
6- Linux for Blue Team: lnkd.in/gvpWMdea
7-Building a Malware Analysis Lab: lnkd.in/gGXunp4q
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🦑Free For You :)) Android SSL Pinning Bypass using Noxer🚨

Automate your Android penetration testing lab setup using Nox Emulator. Noxer is a powerful Python script designed for automating Android penetration testing tasks within the Nox Player emulator. It simplifies setup, enhances stability, manages Frida Server, removes unwanted bloatware, integrates BurpSuite certificates, and much more!

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Clone this repository to your local machine.

git clone https://github.com/AggressiveUser/noxer.git

Navigate to the project directory.

cd noxer

Install the dependencies from the requirements.txt file using pip.

pip install -r requirements.txt

You are now set to run the NOXER script.

python noxer.py

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