ywkw1717 https://blog.hatena.ne.jp/ywkw1717/ yyy https://ywkw1717.hatenablog.com/ Seccompare Leakage Linear_Operation shellcoder OneLine Dump Ramen Seccompare コマンドライン引数で文字列を渡して，それが正解かどうかstrcmpで比較してる．よって，ltraceを使えば比較対象であるフラグが求まる． $ ltrace ./seccompare hoge strcmp("ctf4b{5tr1ngs_1s_n0t_en0ugh}", "hoge") = -5 puts("wrong"wrong ) = 6 +++ exited (status 0) +++ Leakage is_correct関数で入力値… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fywkw1717.hatenablog.com%2Fentry%2F2019%2F05%2F26%2F212753" title="Beginners CTF 2019 Writeup - yyy" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> https://cdn.blog.st-hatena.com/images/theme/og-image-1500.png Hatena Blog https://hatena.blog 2019-05-26 21:27:53 rich https://ywkw1717.hatenablog.com/entry/2019/05/26/212753 1.0 100%