Ns h0503 021104 9 eavesdropping message interception

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NS-H0503-02/1104 9 Eavesdropping - Message Interception Attack on Confidentiality Unauthorized access to information Packet sniffers and wiretappers Illicit copying of data and programs S R Eavesdropper
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NS-H0503-02/1104 10 Tampering With Messages Integrity Attack Stop the flow of the message Delay and optionally modify the message Release the message again S R Perpetrator
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NS-H0503-02/1104 11 Fabrication Authenticity Attack Unauthorized assumption of other’s identity Generate and distribute objects under this identity S R Masquerader: from S
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NS-H0503-02/1104 12 Attack on Availability Destroy hardware (cutting fiber) or software Modify software in a subtle way (alias commands) Corrupt packets in transit Blatant denial of service (DoS): Crashing the server Overwhelm the server (use up its resource) S R
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NS-H0503-02/1104 13 Threat Examples - IP Spoofing A common first step to many threats. Source IP address cannot be trusted! IP Payload IP Header SRC: source DST: destination SRC: 128.59.10.8 DST: 130.207.7.237 Is it really from Columbia University?
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NS-H0503-02/1104 14 Routers Only Care About Destination 128.59.10.xx 130.207.xx.xx Rtr Rtr src:128.59.10.8 dst:130.207.7.237 Columbia Georgia Tech 36.190.0.xx Rtr src:128.59.10.8 dst:130.207.7.237 Stanford
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NS-H0503-02/1104 15 Why Should I Care? Attack packets with spoofed IP address help hide the attacking source. A smurf attack launched with your host IP address could bring your host and network to their knees. Higher protocol layers (e.g., TCP) help to protect applications from direct harm, but not enough.
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NS-H0503-02/1104 16 Current IPv4 Infrastructure No authentication for the source Various approaches exist to address the problem: Router/firewall filtering TCP handshake
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