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Hack Attacks Testing How to Conduct Your - Back to Home

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Figure 6.22 IDS <strong>Testing</strong> module.<br />

CyberCop Scanner 177<br />

Single Out-of-Order TCP Segment Test. This script determines whether your<br />

IDS is capable of reconstructing data from network transactions when the packets<br />

compromising those transactions are sent out of order.<br />

Baseline (Single-Segment). This script determines whether your IDS is appropriately<br />

configured <strong>to</strong> detect attacks in TCP network traffic. A variation is the<br />

Baseline (Multiple-Segments) test.<br />

Desynchronization Test. This script attempts <strong>to</strong> “desynchronize” your IDS from<br />

a TCP connection used for carrying out an attack. By creating a false TCP connection<br />

prior <strong>to</strong> carrying out a real attack, this test attempts <strong>to</strong> convince your IDS<br />

that the attack-bearing connection is entirely invalid, thus preventing it from<br />

moni<strong>to</strong>ring the data exchanged in the connection. This specific test functions by<br />

opening a connection, immediately resetting it, and opening a new connection<br />

in its place.<br />

All Out-of-Order TCP Segment Test. This script determines whether your IDS<br />

is capable of reconstructing data from network transactions when the packets<br />

compromising those transactions are sent out of order. Real TCP/IP network<br />

software is capable of handling arbitrarily ordered packets; IDS is frequently<br />

unable <strong>to</strong> do so.<br />

TCP Sequence Number Verification Test (Jump-Up). This script attempts <strong>to</strong><br />

determine whether your IDS adequately verifies the sequence numbers on TCP<br />

segments. Real TCP/IP network software discards TCP segments that do not<br />

bear appropriate sequence numbers. IDS frequently does not and can be forced

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