多発するVoIP攻撃――VoIP導入には慎重な検討が必要:Column
VoIPトラフィックのスニッフィング、特定のVoIPシステムの実装の欠陥を突いた攻撃、コールマネージャサーバへの攻撃というVoIPの3大脅威とその対策を解説する。
多くの企業ではVoIPシステムの導入を急いでおり、これによって従来型の電話サービスを置き換えようとしている。2~3年間にわたる慎重な検討を経て完成度の高いVoIPシステムを配備した企業もあるが、多くの企業はVoIPのセキュリティ問題を注意深く検討することなく、VoIPの導入を進めている。
VoIPの導入が急速に進んでいるのには十分な理由がある。VoIPはコスト削減につながり、従来のインフラよりも柔軟なシステム構築が可能であるからだ。金銭的なことで言えば、VoIPプロジェクトのROI(投資利益率)は非常に高いという調査結果もある。これは、ほとんどの企業でVoIPを既に配備済みであるか、早急にVoIPを配備する可能性があることを意味する。このため、情報セキュリティ担当者は、VoIPがセキュアな形で配備されるよう注意する必要がある。
VoIP攻撃の手法は幾つか存在する。中でも特に懸念すべきなのが、VoIPトラフィックのスニッフィング、特定のVoIPシステムの実装の欠陥を突いた攻撃、コールマネージャサーバへの攻撃である。以下では、各種の攻撃手法を紹介した上で、VoIPインフラを防御する方法について解説する。
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