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8号館の出席システムが雑魚い件
1.
8号館の出席システムが 雑魚い件
2.
8号館の3階で授業やったことある人? 出席プログラムで出席登録したことある人?
3.
こんなソフト
4.
パケットキャプチャしてみた 手法は至って原始的 教室のPCのLANケーブル引っこ抜いて自ノートPCに 接続、IPアドレス空間を静的に設定してキャプチャ
5.
クライアント サーバ システムからマシン名・ユーザ名取得 Socketを開き、パケットに上記を埋め込む TCP、12345番宛にパケット送信 マシン名・ユーザ名の重複確認 受理後パケット送信
6.
パケットダンプ結果 クライアント→サーバ DATA部以外は至って普通なTCPパケット Data部: 0c + マシン名のASCIIコード
+ 20 + ユーザ名のASCIIコード
7.
パケットダンプ結果 サーバ→クライアント(正常受理時) Data部: 0c + マシン名のASCII
+ 20 + ユーザ名のASCII ! →クライアントと同じデータがきたら出席完了の旨の表示
8.
パケットダンプ結果 サーバ→クライアント(エラー時) Data部: 04 2a 2a
30 31 ! →同じマシンから既に出席がきている場合に送られるパケット このパケットがクライアントに届けられた時、既に出席がされている旨のエラーが表示
9.
つまり・・・? 適当にTCPセッション作ってマシン名とユーザ名を サーバに送れば出席したことになるよ! 暗号化もせずにこんなわかりやすいパケット通信 しちゃだめだよって話 マシン名さえ変えれば受理してくれるし・・・
10.
おわり
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