Exam ple o f vulne rability s ig nature s at le as t

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Exam ple  o f Vulne rability S ig nature s At le as t 75%  vulne rabilitie s  are   due  to  buffe r o ve rflo w S am ple  vulne rability s ig nature Fie ld le ng th c o rre s po nding  to   vulne rable  buffe r > c e rtain  thre s ho ld Intrins ic  to  buffe r o ve rflo w  vulne rability and hard to  e vade Vulnerable buffer Protocol message Overflow!
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Next Generation IDSs Vulne rability-bas e d Adaptive - Auto m atic ally de te c t & g e ne rate  s ig nature s  fo r ze ro -day  attac ks S c e nario -bas e d fo r fo re ns ic s  and be ing  s ituatio nal-aware C o rre late  (m ultiple  s o urc e s  o f) audit data and attac k  info rm atio n
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C o unting  Ze ro -Day Attac ks Protocol Classifier UDP 1434 Core algorithms Flow Classifier TCP 137 . . . TCP 80 TCP 53 TCP 25 Normal Traffic Pool Suspicious Traffic Pool Signatures Network Tap Known Attack Filter Normal traffic reservoir Real time Policy driven Honeynet Statistical detection
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Security Information Fusion Internet Storm Center (aka, DShield) has the largest IDS log  repository Sensors covering over 500,000 IP addresses in over 50  countries
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Requirements of Network IDS Hig h-s pe e d, larg e  vo lum e  m o nito ring No  pac ke t filte r dro ps Re al-tim e  no tific atio n Me c hanis m  s e parate  fro m  po lic y Exte ns ible Bro ad de te c tio n c o ve rag e Ec o no m y in re s o urc e  us ag e Re s ilie nc e  to  s tre s s Re s ilie nc e  to  attac ks  upo n the  IDS  its e lf!
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Architecture of Network IDS Network Network libpcap libpcap Event Engine Event Engine Policy Script Interpreter Policy Script Interpreter Packet stream Packet stream Filtered packet stream Filtered packet stream Event stream Event stream Alerts/notifications Alerts/notifications Policy script Policy script Event control Event control tcpdump filters tcpdump filters
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False podsitive False negative True positive   True negative
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