Eicon Networks S92 Uživatelský manuál stáhnout pdf (Strana 196)

YuChakTinMichael‘sGIACGCFWProjectAssignment

Page 196

Intheory,wecan pingaroundtheinternettofindoutwhocanbeusedasamplifiers.

Thisis,however,extremelytimeconsuming.Also,thedegreeof damageproducedby

individualsystemsishighly limited.Forlaunchingattackofmassivescale,theideal

amplifiercandidatesarenetworksthathaveIPdirectedbroadcastcapableroutersat

theborderandnumerousclientsintheinternalnetwork.

Inresponsetothethreatsposedbythiskindofattack,aprojectknownasSmurf

AmplifierRegistry (SAR)hasbeenlaunched.AccordingtotheofficialSARpage,

“TheSARisatoolforInternetadministratorsbeingattackedbyor implicatedin

smurfattacks,orthosewhowishtotakeprecautions.…TheSARletsyouprobe

InternetconnectedIPnetworkstoseewhetherornottheyareconfiguredinaway

thatwillallowperpet ratorstousethemforsmurfamplification.Probingcanbedone

interactivelyorinbulk.IninteractivemodetheSARwillprobeanetwork,findthe

numberofduplicatesreturned,andsavethisinformationinadatabase.If,andonlyif,

theprobednetwo rkreturns1ormoreduplicatepackets,itismarkedas"broken". 

Upongainingknowledgeofabrokennetwork,theSARwillautomaticallyobtain

informationaboutthenetworkandnotifytherelevantpeopleofthis.”

71

SARappearstobeatoolagainstsmurfattack.However,wecantakeadvantageofits

probingfeaturetolocatenetworksthatare stillvulnerable,andthenmakeuseof

them.

UsingSAR:

WecanuseSARinthefollowingways:

1,Useittoprobeapotentialamplifiernetwork:

71

http://www.powertech.no/smurf/

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Eicon Networks S92 Uživatelský manuál Strana 196