dragons_ctf

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Who ● Gynvael Coldwind o Dragon Sector Team Captain o http://gynvael.coldwind.pl/ o @gynvael ● Mateusz Jurczyk o Dragon Sector Team Vice-Captain o http://j00ru.vexillium.org/ o @j00ru
Dragon Sector? Insomni'hack 2014 Geneva, Switzerland gynvael j00ru adam_i Mawekl fel1x redford mak vnd valis tkd q3k keidii jagger lymphocytus CODEGATE Finals Seoul, S. Korea
Page 1: Pwning (sometimes) with style Drago
Page 5 and 6: Agenda
Page 7 and 8: The SSP leak • Stack Smashing Pro
Page 9 and 10: SSP basics - canary verification
Page 11 and 12: __stack_chk_fail *** stack smashing
Page 13 and 14: __stack_chk_fail void __attribute__
Page 15 and 16: The argv array is at the top of the
Page 17 and 18: We can overwrite it, too! $ ./test_
Page 19 and 20: Very powerful memory disclosure •
Page 21: References 1. Dan Rosenberg, Fun wi
Page 24 and 25: Remote KG Task: Given a PCAP file,
Page 26 and 27: Remote KG So… what is this protoc
Page 28 and 29: Remote KG Next steps: ● write a p
Page 30: JS Puzzle Event: Organizers: SECCON
Page 34 and 35: One-gadget RCE on Linux • Assumin
Page 36 and 37: One-gadget RCE on Linux • An exec
Page 38 and 39: One-gadget RCE on Linux If std{out,
Page 40 and 41: I/O redirection /bin/sh &N • By d
Page 42 and 43: One-gadget RCE on Windows • In GN
Page 44 and 45: One-gadget RCE on Windows • There
Page 46: LoadLibrary(“\\11.22.33.44\payloa
Page 49 and 50: zfs Problem 1: Nothing wants to mou
Page 52 and 53:
zfs ● xor_key ● key.xor_encrypt
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zfs ● Gynvael’s way: Brute forc
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zfs Minimizing input - assume that
Page 58 and 59:
zfs
Page 60 and 61:
zfs
Page 64 and 65:
And about system()… • How do we
Page 66 and 67:
Getting remote shell • Otherwise,
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With this, we can… • Leak the a
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libcdb.com
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There’s another way, too • If w
Page 74:
Other teams do it, as well Quote fr
Page 77 and 78:
World Wide Something ^_- TL;DR: .pc
Page 79 and 80:
World Wide Something ^_- Let's recr
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ROP gadgets near libc imports • E
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ROP gadgets near libc imports • 1
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ROP gadgets near libc imports • S
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Partial .got.plt overwrites • If
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Brute-forcing ASLR • ASLR on popu
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Format String Fun Typical exploitat
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Even More Format String Fun! Assume
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Even More Format String Fun! printf
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Getting read / recv to fail Imagine
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One-sided connection termination
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One-sided connection termination By
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Mumble Mumble high entropy
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Mumble Mumble Approach change: 1. A
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Mumble Mumble
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Mumble Mumble ...- -... .-. -- -.--
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Patching vs instrumentation ● ●
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0x90 Event: SIGINT CTF 2013 Organiz
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0x90 • We decided to run the bina
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It worked! Bochs log console
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Conclusions • CTFs are really fun
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