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Álvaro · Álvaro Felipe Melchor

Solving 'heap' from DefCON 2014 qualified with r2. This article will introduce r2 to resolve a simple CTF from Defcon ‘14 using Linux. For those who do not know radare2 is a. Unix-like reverse engineering framework and commandline tools. And the most important thing about it is that it is open source thus we can play with it. Most people complain about the lack of doc that r2 has but that is far from the truth. Radare has:. In which anyone can contribute. There is a blog. IRC channel on freenode.net.

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Solving 'heap' from DefCON 2014 qualified with r2. This article will introduce r2 to resolve a simple CTF from Defcon ‘14 using Linux. For those who do not know radare2 is a. Unix-like reverse engineering framework and commandline tools. And the most important thing about it is that it is open source thus we can play with it. Most people complain about the lack of doc that r2 has but that is far from the truth. Radare has:. In which anyone can contribute. There is a blog. IRC channel on freenode.net.

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2 still learning

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Álvaro · Álvaro Felipe Melchor | alvarofe.github.io Reviews

https://alvarofe.github.io

Solving 'heap' from DefCON 2014 qualified with r2. This article will introduce r2 to resolve a simple CTF from Defcon ‘14 using Linux. For those who do not know radare2 is a. Unix-like reverse engineering framework and commandline tools. And the most important thing about it is that it is open source thus we can play with it. Most people complain about the lack of doc that r2 has but that is far from the truth. Radare has:. In which anyone can contribute. There is a blog. IRC channel on freenode.net.

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alvarofe.github.io

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Solving 'heap' from DefCON 2014 qualified with r2 Álvaro Felipe Melchor

http://alvarofe.github.io/posts/defcon-r2-heap

Solving 'heap' from DefCON 2014 qualified with r2. This article will introduce r2 to resolve a simple CTF from Defcon ‘14 using Linux. For those who do not know radare2 is a. Unix-like reverse engineering framework and commandline tools. And the most important thing about it is that it is open source thus we can play with it. Most people complain about the lack of doc that r2 has but that is far from the truth. Radare has:. In which anyone can contribute. There is a blog. IRC channel on freenode.net.

2

Archive Álvaro Felipe Melchor

http://alvarofe.github.io/archive

07 May 2016 Solving ‘heap’ from DefCON 2014 qualified with r2. 12 Mar 2015 Format Strings - Level09 Smash the Stack. 25 Feb 2015 Defeating qcrk5 crackme. 18 Feb 2015 TLS and PKI. 09 Feb 2015 Level 08 I/O Smash the Stack. 26 Dec 2014 Level 06 I/O Smash the Stack. 18 Dec 2014 How Linux Implements Generic List. 14 Dec 2014 Stack 0 Protostart. 14 Dec 2014 Nebula Level 03. 11 Dec 2014 Nebula Level 02. 10 Dec 2014 Nebula Level 01.

3

Álvaro · Álvaro Felipe Melchor

http://alvarofe.github.io/page2

Today I am going to write up about how I resolved this crackme. The level of this crackme is easy so it should not be difficult for those with the minimum of knowledge about reversing. This crackme like the majority of them ask for a password that we have to extract it, to bypass the check and win the flag. The first task when we face against these challenges is to know the maximum about the binary. Basically the gather information phase. Statically linked, for. GNU/Linux 2.4.1, stripped. To 0 and then c...

4

About Álvaro Felipe Melchor

http://alvarofe.github.io/about

I am Álvaro (@alvaro fe). I am a security engineer in love about the security field, more related with reversing binaries, auditing code to spot vulnerabilities, UNIX, ethical hacking, etc. From time to time a collaborate in radare2. You can checkout my humble CV. If you want to talk with me the fastest way is through Twitter.

5

Format Strings - Level09 Smash the Stack Álvaro Felipe Melchor

http://alvarofe.github.io/posts/level09iosmash

Format Strings - Level09 Smash the Stack. The topic for this entry is about format string vulnerability. The vulnerability appears when we use functions as. And so on wrongly. Printf("%s", buf); / Good printf(buf); / wrong - What would happen if buf is "%x%x%x"? When we call the latest printf call we are going to read from the stack. The layout would be the following. The code to exploit is the level09 from io.smashthestack.org. The idea is instead of. Section. For those that don’t know about. Basically ...

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Álvaro · Álvaro Felipe Melchor

Solving 'heap' from DefCON 2014 qualified with r2. This article will introduce r2 to resolve a simple CTF from Defcon ‘14 using Linux. For those who do not know radare2 is a. Unix-like reverse engineering framework and commandline tools. And the most important thing about it is that it is open source thus we can play with it. Most people complain about the lack of doc that r2 has but that is far from the truth. Radare has:. In which anyone can contribute. There is a blog. IRC channel on freenode.net.

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