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Overflow

Security enthusiast. Aspiring computer scientist. Monday, May 18, 2015. Defcon 2015 : Coding Challenge. This was an interesting challenge where you connect to a remote machine and you're given a set of x64 registers(no rsp, rbp), some bytes and are expected to send back a reply in the "same format". We can assume that the bytes correspond to some shellcode that we are supposed to emulate and send the results of. The python script can be found here. And the pintool can be found here. Links to this post.

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Overflow | x86overflow.blogspot.com Reviews

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Security enthusiast. Aspiring computer scientist. Monday, May 18, 2015. Defcon 2015 : Coding Challenge. This was an interesting challenge where you connect to a remote machine and you're given a set of x64 registers(no rsp, rbp), some bytes and are expected to send back a reply in the same format. We can assume that the bytes correspond to some shellcode that we are supposed to emulate and send the results of. The python script can be found here. And the pintool can be found here. Links to this post.

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Overflow | x86overflow.blogspot.com Reviews

https://x86overflow.blogspot.com

Security enthusiast. Aspiring computer scientist. Monday, May 18, 2015. Defcon 2015 : Coding Challenge. This was an interesting challenge where you connect to a remote machine and you're given a set of x64 registers(no rsp, rbp), some bytes and are expected to send back a reply in the "same format". We can assume that the bytes correspond to some shellcode that we are supposed to emulate and send the results of. The python script can be found here. And the pintool can be found here. Links to this post.

INTERNAL PAGES

x86overflow.blogspot.com

1

Overflow: Hopper scripting bug : Document.getCurrentDocument().getSegmentAtAddress(addr)

http://x86overflow.blogspot.com/2014/07/hopper-scripting-bug.html

Security enthusiast. Aspiring computer scientist. Friday, July 11, 2014. Hopper scripting bug : Document.getCurrentDocument().getSegmentAtAddress(addr). The workaround was to do something as follows :-. Subscribe to: Post Comments (Atom). Hopper scripting bug : Document.getCurrentDocument. Pwnium 2014 rev300 (using Hopper scripting). Simple template. Powered by Blogger.

2

Overflow: Flare-on Results

http://x86overflow.blogspot.com/2014/09/flare-on-results.html

Security enthusiast. Aspiring computer scientist. Wednesday, September 24, 2014. Seems the flare-on.com challenge is complete and I finished 33rd. Subscribe to: Post Comments (Atom). CSAW 2014 Exploitation 400 - Saturn. Simple template. Powered by Blogger.

3

Overflow: CSAW 2014 Exploitation 400 - Saturn

http://x86overflow.blogspot.com/2014/09/csaw-2014-exploitation-400-saturn.html

Security enthusiast. Aspiring computer scientist. Monday, September 22, 2014. CSAW 2014 Exploitation 400 - Saturn. You have stolen the checking program for the CSAW Challenge-Response-Authentication-Protocol system. Unfortunately you forgot to grab the challenge-response keygen algorithm (libchallengeresponse.so). Can you still manage to bypass the secure system and read the flag? From the missing shared object file, that is probably setting two global variables(renamed as g1 and g2). The input character...

4

Overflow: November 2013

http://x86overflow.blogspot.com/2013_11_01_archive.html

Security enthusiast. Aspiring computer scientist. Saturday, November 9, 2013. RWTH CTF : Smartgrid writeup. RWTH CTF 2013 had an interesting python service by the name of Smartgrid that had an admin interface challenge-response based authentication set up as follows : https:/ gist.github.com/eQu1NoX/fdd78e7b44cb9afc10b8. Something like this :. Https:/ gist.github.com/eQu1NoX/b0bbb47b540d57b22909. After this we could issue "readstatus" requests that would get us flags. Links to this post.

5

Overflow: pwnium 2014 rev300 (using Hopper scripting)

http://x86overflow.blogspot.com/2014/07/pwnium-2014-rev300-using-hopper.html

Security enthusiast. Aspiring computer scientist. Monday, July 7, 2014. Pwnium 2014 rev300 (using Hopper scripting). Played with Team Segfault. I've noted down a failed approach and a solution in the form of a Hopper script that I came up with after the CTF. Who had solved the challenge in time has written a writeup on the same here. Using PIN). Other writeups for the challenge can be found here. Static analysis), and here. Var m8]). So lets examine XREFS at this point,. Visiting the XREF we have,. At ce...

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x86overflow.blogspot.com

Overflow

Security enthusiast. Aspiring computer scientist. Monday, May 18, 2015. Defcon 2015 : Coding Challenge. This was an interesting challenge where you connect to a remote machine and you're given a set of x64 registers(no rsp, rbp), some bytes and are expected to send back a reply in the "same format". We can assume that the bytes correspond to some shellcode that we are supposed to emulate and send the results of. The python script can be found here. And the pintool can be found here. Links to this post.

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