OverRide - Binary Exploitation And Reverse-Engineering (From Assembly Into C)

Explore disassembly, binary exploitation & reverse-engineering through 10 little challenges. In the folder for each level you will find: flag - password for next level README.md - how to find password source.c - the reverse engineered binary dissasembly_notes.md - notes on asm See the subject for more details. For more gdb & exploitation fun check out the previous project RainFall.Final Score 125/100Getting Started First download from 42 OverRide.iso. Virtual Machine setup On Mac OSX, install VirtualBox. In VirtualBox create a new VM (click new). Name and operating system - Type: Linux, Version: (Oracle 64-bit) Continue through all the next steps with the default settings: Memory size: 4MB Hard disk: Create a disk now Hard disk file type: VDI(VirtualBox Disk Image) Storage on physical hard disk: Dynamically allocated File size: 12,00GB Next click Settings > Network > Adapter 1 > Attached to: Bridged Adapter. Still in settings click Storage > Right of "Controller: IDE", there is a CD icon with a + sign (add optical drive). Click Add Disk Image, and select OverRide.iso. Click Start to start the VM, once runnning it should show the VM IP address and prompt user to login. SSH connect Log in from a separate shell as user level00 with password level00. ssh level00@{VM_IP} -p 4242 Level Up As user level00 the goal is to read the password for user level01, found at /home/users/level01/.pass. However, user level00 does not have permissions to read this file. In the home folder for user level00 is a binary level00 with SUID set and owner level01. This means when we execute the binary level00, we do so with the permissions of user level01. We must find a vulnerability in the binary level00 with gdb. Then exploit the vulnerability to run system("/bin/sh"), opening a shell as user level01 where we have permissions to read the password. cat /home/users/level01/.pass Then log in as user level01. su level01 Repeat for each level. Reverse-engineered binary For each level, we reverse engineered the original source.c by examining the gdb disassembly of the binary. Levels Overview 0 - Hardcoded password 1 - Ret2Libc attack 2 - printf() format string attack 3 - Brute force password 4 - gets() stack overflow + Return-to-libc attack 5 - Shellcode in env variable + printf() format string attack 6 - Hash value discoverable with gdb 7 - Ret2Libc Attack on unprotected data table 8 - Binary backs up password via symlink 9 - Off-by-one error Team I wrote this project in a team with the awesome @dfinnis. Download OverRide
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Hacking on Medium
Data Leak — B2B eCommerce Platform Bizongo

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What we know so far about the Bizongo.com data breach

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Hacking on Medium
Eight Short Links of Recent Cyber Security Data Science Papers

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A short listing of cyber security data science research papers I’ve discovered recently. Each of them uses machine learning or enables ML…

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Hacking on Medium
ZeroPointSecurity Certified Red Team Operator Course (CRTO) Review

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Frustration Courtesy of Covenant

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Hacking on Medium
Vulnhub: Pylington Walkthrough

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Boot2Root step by step walkthrough

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XSS Nedir-Nasıl bypass Edilir?

Herkese merhaba bu yazımda sizlere kendi bilgim dahilinde xss’in ne olduğuna nasıl bulunduğuna ve de bazı bypass yöntemlerini anlatcam.Çok…Continue reading on Medium »
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KitPloit - PenTest Tools!
OverRide - Binary Exploitation And Reverse-Engineering (From Assembly Into C)

https://1.bp.blogspot.com/-Xs7VjGHtrbY/YIJaoHGvHpI/AAAAAAAAV7w/ufd4B8ALFVcN4vgBy-OeNIvi-8WDTK-ZwCNcBGAsYHQ/w640-h204/OverRide_1_ssh.png Explore disassembly, binary exploitation & reverse-engineering through 10 little challenges.

In the folder for each level you will find:

*
flag - password for next level

*
README.md - how to find password

*
source.c - the reverse engineered binary

*
dissasembly_notes.md - notes on asm
See the subject for more details.

For more gdb & exploitation fun check out the previous project RainFall. Final Score 125/100 Getting StartedFirst download from 42 OverRide.iso. Virtual Machine setupOn Mac OSX, install VirtualBox.

In VirtualBox create a new VM (click new).

* Name and operating system - Type: Linux, Version: (Oracle 64-bit)

Continue through all the next steps with the default settings:

* Memory size: 4MB
* Hard disk: Create a disk now
* Hard disk file type: VDI(VirtualBox Disk Image)
* Storage on physical hard disk: Dynamically allocated
* File size: 12,00GB

Next click Settings > Network > Adapter 1 > Attached to: Bridged Adapter.

Still in settings click Storage > Right of "Controller: IDE", there is a CD icon with a + sign (add optical drive). Click Add Disk Image, and select OverRide.iso.

Click Start to start the VM, once runnning it should show the VM IP address and prompt user to login. SSH connectLog in from a separate shell as user level00 with password level00. ssh level00@{VM_IP} -p 4242https://1.bp.blogspot.com/-GvSFZ7oAPss/YIJa9u-D-6I/AAAAAAAAV74/nqOlSvwv2ewdiy39Zyyr5kJFqrkjNKcJACNcBGAsYHQ/w640-h204/OverRide_1_ssh.png Level UpAs user level00 the goal is to read the password for user level01, found at /home/users/level01/.pass. However, user level00 does not have permissions to read this file.

In the home folder for user level00 is a binary level00 with SUID set and owner level01. https://1.bp.blogspot.com/-8lWjYZOf80A/YIJbDTPRhBI/AAAAAAAAV78/0xidIsYllsolZYbZOZQjszKO03lhuG_5wCNcBGAsYHQ/w640-h90/OverRide_2_suid.png This means when we execute the binary level00, we do so with the permissions of user level01.

We must find a vulnerability in the binary level00 with gdb. Then exploit the vulnerability to run system("/bin/sh"), opening a shell as user level01 where we have permissions to read the password. cat /home/users/level01/.passThen log in as user level01. su level01https://1.bp.blogspot.com/-dWFPlyrND88/YIJbIn62ZYI/AAAAAAAAV8A/tGYQ64TVxG8xZrzYxOs9GshbSPE9O4YngCNcBGAsYHQ/w640-h274/OverRide_3_su.png Repeat for each level. Reverse-engineered binaryFor each level, we reverse engineered the original source.c by examining the gdb disassembly of the binary. Levels Overview* 0 - Hardcoded password

* 1 - Ret2Libc attack

* 2 - printf() format string attack

* 3 - Brute force password

* 4 - gets() stack overflow + Return-to-libc attack

* 5 - Shellcode in env variable + printf() format string attack

* 6 - Hash value discoverable with gdb

* 7 - Ret2Libc Attack on unprotected data table

* 8 - Binary backs up password via symlink

* 9 - Off-by-one error TeamI wrote this project in a team with the awesome @dfinnis. Download OverRide

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Deep Web
Download Tails on Windows 10 and it keeps saying "file currupted" how do I fix this?

I am trying to install tails on my flash drive and tried to burn it on my flash drive with etcher and it says can't burn because system file is corrupted, what do I do to make it not corrupted, I'm frustrated right now someone help me please.

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hacking: security in practice
Wondering if it’s possible to make an airtag

I was thinking maybe you could copy the signal coming out of an airtag and make an airtag for cheaper? Any ideas

submitted by /u/jaekim24
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hacking: security in practice
The Incredible Rise of North Korea’s Hacking Army

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Hacking on Medium
Duolingo Hacks XP Tricks

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Hi everyone, I was really glad I could share another knowledge this week. This article is perhaps a ‘cheat’ tutorial for Duolingo app. Did…

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Hacking on Medium
Using Emacs for Presentation

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Overview

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