Linuxの勉強中にCOWを調べていたら、こんな脆弱性の情報を見つけたので、AWSのゲストOSで試してみました。 結論から言うと、脆弱性が再現されました。(一般ユーザーがrootユーザーのファイルを書き換えてしまうことを確認) 【情報元】 ①脆弱性の内容 https://dirtycow.ninja/ "A race condition was found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged local user could use this flaw to gain write access to otherwise read-only mem
![Linux 脆弱性の検証 Dirty COW (CVE-2016-5195) - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/6249c9ae1d837a1e5bcd08bcd04574fdce322b9b/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9TGludXglMjAlRTglODQlODYlRTUlQkMlQjElRTYlODAlQTclRTMlODElQUUlRTYlQTQlOUMlRTglQTglQkMlRTMlODAlODBEaXJ0eSUyMENPVyUyMCUyOENWRS0yMDE2LTUxOTUlMjkmdHh0LWFsaWduPWxlZnQlMkN0b3AmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT01NiZzPTY2YWM4MDJkYmU5ZGU1YzQ5ZWJlZjViNmE4YWUyODk5%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDB0YWtlc2hpbSZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTM2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9MDIzZDQ2NzFjYWEzOTljZTFhMWY1YmU4OGY4NDgyMGQ%26blend-x%3D142%26blend-y%3D486%26blend-mode%3Dnormal%26s%3D8b4e65f16a30ab72019e28ad03823ad8)