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As every year hacking-lab.com carried out the annual Hacky Easter event with 27 challenges. As usual the variety of the challenges was awesome. I actually got full score this year 🙂 Many thanks to daubsi, who gave me a nudge once in a while on the last challenges (you can find his writeup here). |
nullcon HackIM 2019 – babypwn
The nullcon HackIM 2019 CTF (ctftime.org) ran from 01/02/2019, 16:30 UTC to 03/02/2019 04:30 UTC.
I did the pwn challenge babypwn, which was really fun to do. The following article contains my writeup being divided into the following sections:
→ Challenge description
→ Security mechanisms and disassembly
→ Signedness vulnerabilitiy
→ Format string vulnerabilitiy
→ Final exploit
Heap Exploitation: Off-By-One / Poison Null Byte
The goal of this article is to explain in detail how an off-by-one vulnerability on the heap also known as poison null byte can be exploited. Although this technique does not work with the latest libc, I think it can be used very good in order to demonstrate how exploits based on heap-metadata corruption work (also check out shellphish’s how2heap).
In order to do this I created a vulnerable program, which we will use as an example to create such an exploit. If you like to, you can start by analyzing and exploiting the program on your own (at least check out Environment):
–> heap.zip
Though it is not required to the exploit the program, the source-code might be helpful:
–> heap.c
The article is divided into the following sections:
–> Environment
–> Vulnerable Program
–> Heap Basics
–> Libc-Leak
–> Control Instruction Pointer
–> One Gadget
–> Final Exploit
Continue reading “Heap Exploitation: Off-By-One / Poison Null Byte”
Meepwn CTF Quals 2018 – babysandbox
The Meepwn CTF Quals 2018 (ctftime.org) ran from 13/07/2018, 19:00 UTC to 15/07/2018 19:00 UTC.
There were a lot of interesting-looking challenges. As always, time was the limiting factor 😉 I managed to spend 2 hours on saturday morning solving the pwn challenge babysandbox.
Hacky Easter 2018 writeup
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As every year hacking-lab.com carried out the annual Hacky Easter event with 27 challenges. I could not spend as much time as I would have liked to on solving the challenges, but after all I managed to collect 25 of the 27 eggs and focused on this writeup. |
angstromCTF 2018 – writeup hellcode
The angstromCTF 2018 (ctftime.org) ran from 16/03/2018, 20:00 UTC to 23/03/2018 00:00 UTC.
As the description on ctftime.org states, the ctf is primarily geared towards high school students but with a very wide range of challenge difficulty.
There have been a lot of interesting challenges which have been fun to do. I decided to make a writeup for the pwn challenge hellcode.
RPISEC/MBE: writeup lab09 (C++)
In the last lab we focused on Misc and Stack Cookies. In this next to last lab some characteristics when dealing with C++ are introduced.
RPISEC/MBE: writeup lab08 (Misc and Stack Cookies)
While the last lab introduced the subject of Heap Exploitation, this lab focuses on Misc and Stack Cookies.
The lab contains three levels again ranging from C to A:
–> lab8C
–> lab8B
–> lab8A
Continue reading “RPISEC/MBE: writeup lab08 (Misc and Stack Cookies)”
TAMUctf 18 – writeup pwn1-5
The Texas A&M University CTF (ctftime.org) ran for over one week from 17/02/2018, 00:00 UTC to 26/02/2018 00:00 UTC. There have been a lot of challenges starting at a very easy difficulty.
I did the five pwn challenges ranging from 25 to 200 points:
–> pwn1 (25 pts)
–> pwn2 (50 pts)
–> pwn3 (75 pts)
–> pwn4 (125 pts)
–> pwn5 (200 pts)
RPISEC/MBE: writeup lab07 (Heap Exploitation)
After we have introduced ASLR and ways to bypass it in the last writeup, we will expand our exploits to the Heap in this lab.
In this lab there are only two levels:
–> lab7C
–> lab7A
Continue reading “RPISEC/MBE: writeup lab07 (Heap Exploitation)”