Write up reverse200

14
AEOI CTF Quals 2013 Reverse 200

Transcript of Write up reverse200

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AEOI CTF Quals 2013

Reverse 200

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● 問題文は What is the flag ? のみ● find_prime_again.txt というファイルをダウンロード

する

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● とりあえず何のファイルなのか調べる

● file find_prime_again.txt

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● ファイル名のとおり、素数を判別しているみたい

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● プログラムだけどストライプされていて厄介● とりあえず逆アセンブルとかデバッガとかを利用して解析していく

● gdb とか objdump とか

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● 何かファイル開いている● 第一引数はファイルのパス

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● /tmp/flag.dat というファイルを開いている

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● 書き込んで閉じている● 書き込んでいる内容と実際に書き込まれた内容を確

認する。

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● 書き込まれる内容と書き込まれた内容

● this is NOT flag!!!!

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ちょっと飛ばします

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● 何か実行時には呼ばれていなかった関数があった

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● 入力を求められた時に入れた数と

0x1935c8b7 という数を比べて一致したら関数が呼ばれるようになっている

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● 0x1935c8b7(422955191) を入力してみる

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● 0x1935c8b7(422955191) を入力してみる

● やったぜ


Pick up a reading page from the front. Preview the pictures and write quickthinks next to each.

Pick up a reading page from the front. Preview the pictures and write quickthinks next to each.

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Programming exercises: Angel – lms.wsu.edu – Submit via zip or tar – Write-up, Results, Code Doodle: class presentations Student Responses First visit.

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