{"title":"CODE GRAY CTF sured writeup","type":"rich","description":"\u306f\u3058\u3081\u306b \u4e00\u4ebawriteup advent calendar\u306e5\u65e5\u76ee\u3067\u3059\u30021\u65e51\u554f\u5206\u306ewriteup\u3092\u76ee\u6a19\u306b\u9811\u5f35\u3063\u3066\u3044\u304d\u307e\u3059\u3002 5\u65e5\u76ee\u306e\u554f\u984c\u306f\u3001CODE GRAY CTF\u3067\u51fa\u984c\u3055\u308c\u305f\u300csured\u300d\u3002race condition\u3092\u4f7f\u3063\u305f\u554f\u984c\u3067\u521d\u3081\u3066\u306e\u4eba\u306b\u30aa\u30b9\u30b9\u30e1\u3067\u3059\u3002 \u521d\u671f\u8abf\u67fb \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6a5f\u69cb\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3001\u7279\u7b46\u3059\u3079\u304d\u3068\u3053\u308d\u306fcanary\u304c\u306a\u304fstack\u3067bof\u304c\u3042\u308c\u3070\u3001\u7c21\u5358\u306b\u5236\u5fa1\u3092\u596a\u3048\u308b\u3053\u3068\u3002 [root@ubuntu] ~/ctf/CODEGLAY/sured # checksec ./23016_sured [*] '/root/ctf/CODEGLAY/sured/23016_sure\u2026","height":"190","version":"1.0","author_name":"hama7230","width":"100%","published":"2018-12-05 13:00:55","blog_url":"https://hama.hatenadiary.jp/","url":"https://hama.hatenadiary.jp/entry/2018/12/05/130055","provider_url":"https://hatena.blog","categories":[],"image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhama.hatenadiary.jp%2Fentry%2F2018%2F12%2F05%2F130055\" title=\"CODE GRAY CTF sured writeup - \u30d6\u30ed\u30b0\u672a\u6e80\u306e\u306a\u306b\u304b\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/hama7230/","blog_title":"\u30d6\u30ed\u30b0\u672a\u6e80\u306e\u306a\u306b\u304b","provider_name":"Hatena Blog"}