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Դ ߣ ɶ 2007-12-14   ʣinternettcp/ipЭcisco·solarisԶܾ̾񡡡
200027տʼYahooeBayȼĴҵվ⵽ڿ͵Ϯ糤Сʱ̱ͳƣϮɵľʧ12ԪϡϮ˸ԼȫϢҵĹ㷺עйرιַԴûĿվʹû޷ʹĿվϵͳ̨ͬʱ˹жһܾ֡񹥻Denial 
of ServiceDoSĵ͹ʽĽҪֹʽԭߺͽ 
ܾ񹥻󲿷ֹͬΪǲԻϢķȨΪĿġҪʹΪʹṩͨúľ硢ϵͳӦó޵Դʵ֡
漰ӦãHTTPFTP񣬹ܹòзֵ֧ӣЧİѷʹ߹档ܾʹҲͨInternetЭʵ֣TCPICMP󲿷־ܾ񹥻ʹñϵͳṹϵʹСȱݻȫ©ȻЩͨòϣġõ籨籩ṩԴ״̬ϢΣܡʽЩļ֮ǰȴʵеʵʽǶһЩǵ⡣
һǰļſ
ǽΪϸĽ֮ǰȶһ¸˽⡣밲ȫصЩСϸĻܳΪһ½ڣƪԭֻһ´˽⡣
 
ǰڲϵͳӦó밲ȫصϵͳȱݣЩȱݴڴĳƣĵԴˣĵĸЧӦһЩʵİɵġݴϢĶϵͳƻδɵķʳ̶ȣЩ©ԱΪͬĵȼ
 
͵ľܾ񹥻ʽԴľԴءһԴĺ󳬹Դ֧ʱͻɾܾ񹥻磬ѾصWebй󡣣ܾ񹥻п߶ԳĴɵġֶľܾ񹥻ͷǶķ߶ԴǷݣӶʹû޷ø÷Դ
 
ҲΪϵͳİȫЩͨӲװãϵͳӦóСе·ǽԼ豸ȷûСЩĿԡ©ӦרҵļԱЩ⡣ 

D.O.S
DoSĹʽкܶ֡DoSúķռùķԴʹأ޷ӦЩԴļϵͳռŵĽ̻ڵӡֹᵼԴѷۼĴٶȶô죬ڴô󣬻ٶȶô춼޷ֹĺΪκ¶һޣԣҵһʹֵڸüֵ˾ͻʹṩķԴѷ޷ǧҪΪԼӵ㹻ĴͻһЧʵվܾ񹥻ʹеԴ÷ǳС
ͳϣٵҪɽСģͽٶȣ޷ʹ߷Ȼ"the ping of 
death"ĹͽҪİͿԴݻһûдUNIXϵͳȻDoSҪ൱ĴģǸߴǴ˾ӵеģԸΪĺڿͺáΪ˿˷ȱ㣬Ĺ߿˷ֲʽĹ߾Ϳù߼ͬһĿ귢ʹµ׵¾ܾ񹥻

 
ڳԱԳıƣϵͳͣḶ̌պľԴֻͬϵͳƽ̨ȡĳЩԷֹһЩûռùϵͳԴҲ龡Դķʽְȫв

 
һɴ̴洢ռġһûȨ洢ļĻпֻΪϵͳºСĿռ洢־ļϵͳϢһֲĲϰߣϵͳӦöϵͳǡ
ӰȫĽǶصľܾ񹥻ԱȽ׵׷ٲƪҪ绷µDoSǴһ½ΪĻľܾ񹥻
.D.O.Sֻʽ
(1)
ķһ̨еķػʱͻᷢءЩͨ෽ʽǹġڷʱУЩˮʹüʮæµشЩϵ޷ͬʱµ󱻶ΪûпռЩһTCPЭķôЩİᱻطĸֹһΪڸԼĺۼֹԹߵļ¼͵½ϵͳơֹֹϵͳṩһض(2)Ϣ
Ϣûһ̨ϵĿʹݰӻĿĴٶȣֹЩļҪ½߽Ǽ򵥵ҪӦpingʲôʽЩˮķ󣬼ĿĴأʹĿ˴ԴӦЩ󡣼˵ֹĿΪûڴ壬Դŵ󣬻Ϊ־ܾĹҪһ򵥵Ĺǡ㲥籩߿һϢָʾÿһյشطϢ籥ͣҲʹá㲥籩ɹĹ£ͨӲԵʣ磬ڿ֮Уڴûȷذװ
().źŽӵ
ҲԹرһ硣ĵ½ӵأһЩźŻ߽̫ϵĶ˽ߣЧֹͻͻ߽ϢֹʽֹЩṩԴĸֻҲֹ㱨ĵ¼ΣյжڸһηǷʵͼ£Ҫ淢ֵĴϢĵ²ؽ豸ҲԼٱвֱʩ˶ԵϵĸڵļƭҲЧطźŽӵܾĹ

.ܾ幥
(һ).PING ODEATH
ping o' deathICMPЭһƬ߷һȳ65535Echo 
RequestݰĿƬʱȷ65535ֽڻϵͳͨpingǷICMP Echo 
RequestݰǳԹһ°ɣIPICMPײˣݳȷǶƣ65535ɣһ

# ping -c 1 -s 65535 192.168.0.1
Error: packet size 65535 is too large. Maximum is 65507

ˣLinuxԴping¡65507õģ65535-20-8=65507Win2Kµpingţֻ65500СĳĿǰ°汾ĲϵͳѾ㶨ȱˣ㻹ǼĶİɡ
˳һ£ǵ99Сڿ͡͡ǰȫĳһʱ̿ʼpingĳվ㣬ͼpingԶ̷ʵһping 
floodôEchoRequestӦٶȺĿ磬ԭping o' deathǲһģҪ


()ֲʽܾ񹥻ʵ 
(1)ֲʽܾ񹥻
ֲʽܾ񹥻ۺͼԺΪʶֲʽܾʼ߲òзơڷֲʽܾ񹥻Уóɰǧơڵܺڵ㷢ģЭͬͬʱ(flood)ܺڵ㡣ڹԺܶڵ㣬ʹ̶ܺȸأ漰Χ㣬Ҳѷֹߡ 


(2).ֲʽܾ񹥻ԭ
๥бȽTrin00TFNTribe Flood 
NetworkTFN2kԼstacheldraht˿˼ȡ19996£Trin00ȱ繥19998£תTFNTFNݳMixterڷTrin00ʱдģTFNTFN2k19999µףTFNĳΪstacheldrahtĹŷ޺ϡ 

ֲϵͳServer/Clientģϵ͵ķֲϵͳУһһ߿һ򼸸Master , 
ƴֲDaemonDaemon ֱܺڵ㷺ʵʩ總ͼʾ 
Trin00Ϊ˵ֲʽԭTrin00ںܶڵܺڵ㷢ЭͬUDPDaemonʱMasterIPַDaemonһװʱMaster31335˿ڷͰ*HELLO*UDPעԼͨtelnetnetcatȳMaster27665˿ڣָMasterĳһIPַڵ㷢MasterUDPʽDaemon27444˿ڷDaemonʵʩֱӵĹ¡ 


1ߡMaster27665/TCP; 

2 MasterDaemon27444/UDP; 

3 Daemonܺڵ㣬ĿĶ˿/UDP. 
߷͵Ҫ6֣ 
 Ҫ 

 
Mtimer ùʱ
Dos ĳڵ㷢
Mdie ɱDaemon
Mping pingеDaemon
Mdos ڵ㷢
Msize ùUDPС

MasterʱпҪMasterԼʽ洢Daemon IPַMasterDaemon֮ͨҲп 

ӦעʵDDoS׶ɡʵʩDDoS׶ǰһģֽ׶Σִڵ㣨ɰǧװDDoSDaemonЩڵܺߡһ׶ֿ֪ĸ©ĿǰѷֵġõRPCrpc.statdrpc.cmsdrpc.ttdbserverе© 

TFNرTFN2kԼstacheldraht ڹܺԷ˽һߡUDP⣬ǻԲTCP 
SYNICMP echo 
ICMֱӹ㲥ʽDoSȡеİԼðԴIPַָϢͨŲȽļܷԷƭ⣬ԶµDaemonЩʹЩƻͬʱԱ⡣ 

ֲ֮ȫµģ죬ʹǲĹҲ÷Ĺشƻ 

(3)DDos;ο 
κûӦаȫʶҪκʱܱ׼ԼĹǸӶģûһݵĽ취DDoSȻԾӹϵͳܵزװDaemonĿǰûЧļֹڵ㲻ΪЭͬķֲ鹥ܺߡ߼ϵͳİȫԼָһ־õĹ̡ӼǶ˵ӦڷӦȡʩܵԼܹɵʧ 


(4) ڷ棬ӦȡĴʩ¼㡣 
1. õĽڵͨΪ֪©Ҫʱش򲹶ϵͳ 
2. ڽйʱͨðԴַеĽڵʵڹˡ 
3. ߽簲ȫȷİܵȷơ 
4. йذȫȨվ㣨CERTȣİȫʩ 
⣬Ӧɨϵͳϵͳ© 
ڼⷽ棬鰲װּ⹤ߡĿǰһЩڼͷDDoSĹߡNIPCһʵʩģڼTrin00TFNĹԼISS˾·ļDDoSĹߵ汾ȵȡҪ־ейؼDDoSߵӡԼICMP 
echo Ͳĸ⡣ 
Ӧ棬ܵDDoSĹУûпôֱʵʱӦؼǼʱϵISPйӦ֯Ӱϵͳȷ漰ڵ㣬Ӷ赲֪ڵ׷ٹߡйش㷨Чظ١ߵļ͹ߵȶдһо 

ӦָǣȫInternetŬĽֲʶÿվİȫҪվ㹲ͬŬûԼISP֮䶼ӦͬƶƻİȫԣӶܵطֹĶƻ 

(). SYN Flood
(1)SYN Flood
SYN FloodһֳЧԶܾ̾(Denial of 
Service)ʽͨһĲƻTCPֽӣռòķϵͳԴʹṩTCPϵͳ޷ 
TCP SYN 
FloodͨײԷйģıԼַͬʱϵ豸ʶ͸׷鷸Դɺܴѡ 
ڹʵվУֹżʡڽеһվϣзֶΣڵͼλʱֹûƷ̵ 

(2)TCP SYN FloodĻ 
,Ҫʹþαװ޷ͨ·ɴﵽԴIPַΪ߲ϣκεյĿϵͳصSYN/ACK᷵һRST(޷жϸδʱͨRST)ӶСͻͨTCPͷSYN־λݷֶεӡͨ£˻ᰴIPͷеԴַSYN/ACKλݰͻˣͻٷACKһ(Figure-1) 
ڹʱͻ˵ԴIPַǾα(spoofed)еIP·ɻƽĿIPַתIPĿ󷵻·޷ͨ·ɴﵽģĿ޷ͨTCPֽӡڴڼΪTCPѾܾµĿһֱֱʱ(Լ75)Ǹù͵Ļơ 

ֻҪͽٵģԴַαװ޷ͨ·ɴﵽSYNĿṩTCPĶ˿ڣĿTCPͿʵʩһγɹĹʵ£ʱǳҸٵġҪʹþαװ޷ͨ·ɴﵽԴIPַΪ߲ϣκεյĿϵͳصSYN/ACK᷵һRST(޷жϸδʱͨRST)ӶСɴ˿ԿֹʽTCP/IPЭ鱾ıڣҹ߿ͨIPαװЧԼĿ˵޷жϹԴܲȡЧķʩ 

(3).SYN FloodԶܾ̾񹥻ص: 
TCP/IPЭıڽй 
ʱֻҪٵͿԲЧ 
Դ޷λ 
ڷ޷TCPǷϷ 
жܵSYN FloodԶܾ̾񹥻 
һ£һЩ򵥲м飬жϵͳǷTCP SYN Flood 
1 ޷ṩTCP󱻾ܾʱ 
2 ͨ netstat an ϵͳдSYN_RECV״̬ 

(4).Чķ 
һ£һЩ򵥲м飬жϵͳǷTCP SYN Flood
1޷ṩTCP󱻾ܾʱ
2ͨ netstat -an ϵͳдSYN_RECV״̬

βЧķ?
1.TCP Wrapper 
ʹTCP 
Wrapper(ֻunix-likeϵͳָ֧ùܣNT?)ĳЩ޵ĳãֻԴIPTCPδָԴһžܾһҪṩĳǲʺϵġҹ߿ͨIPαװ(IP 
Spoof)ֱӹTCP WrapperTCP񣬸߿Թ߿αװɷĵַй 
2.TCP Backlog 
TCP Backlogһα겻αһҪռøϵͳڴ棬һӳTCPеʱ䡣ֻҪͣصĽSYN 
FloodһԴﵽܾĿġ 
3.ISP롡 
еISPڱ߽紦IPݰʱԴַǷϷָԴIPַΧΪIP SpoofingΪ֮

(5).TCP SYN Flood 
1.TCPӼ(TCP Interception) 
ΪЧķTCP SYN Floodڱ֤ͨû˵ĺϷӵͬʱҪܵļٷTCP 
Backlogʱ䣬ǽTCPӼصĹģʽ1. ǽӵûZSYNڱؽӵļر 
2. ǽ֮תA 
3. AӦ󷵻SYN/ACKͬʱļر 
4. ǽSYN/ACKתûZ 
5. ǽACKAͬʱATCP BacklogӵıƳ 
a. ûZϷǽACKתAAԸACKΪһTCPѾ 
b. ûZǷ(ԴIPַǷ)ûڹ涨ʱյصACKǽᷢRSTAԲӡ 
6. ʼTCP̡ 
ɴ˿Կ÷: 
1 ǷϷֱתAжΪǷ(޷ACK)ʱŲȡʩӣ˷ѷϵͳԴ 
2 ǽڱؽԼ(һTCP Backlogı)пܱá 
2.DoS 
ǽþŻTCPӼعʽ÷ʽڴTCPʱȷǷϷǰûZAǸϵġ1. 
ǽӵûZSYN 
2. ǽһ⴦SYN/ACKͻZ֤ӵĺϷԣ 
3. ʱǷϷ: 
a ǽյԿͻZACKӦϷת4 
b ǽûнյԿͻZACKӦǷд 
4. ǽڱؽӵļرSYNA 
5. ǽӵԷASYN/ACKӦ 
6. ǽACKԽһTCPӣ 
7. ǽACKͻZʾԿʼTCP̡ 
Уڵ2/3/4/7Уǽڲ²: 
1. ڵ2УΪ֤ӵĺϷԣǽصSYN/ACKǾ⴦ģʾͻZʱҪЧݣ
2.ڵ3УǽյԿͻZACKϷԡ 
3. ڵ4УǽڱؽӵļرͬʱصSYNA 
4. ڵ7УǽͨTCPݴرбȶԣкźʹʹ֮ƥ䡣ʼTCPݴ䡣 
ǽͨЧ㷨64KλHashṩ˳30ϵͬʱΪݴĸЧͿɿṩǿر.
ʵʻУӦΪ漰ķΧ̫㷺÷޷ʵʩһǼ⡣
() .SmurfԲ
(1).Smurf 
SmurfֹĳSmurfֹʹIPƭICMPظʹ紫ĿϵͳĿϵͳܾΪϵͳз
(2).Smurf ԭ
ĹģWoodlly AttackerһдӵĹ㲥ַһƭPing飨echo 
󣩣Ŀ类Ϊվ㣬ƭPingԴַWoollyϣϵͳ
ֹǰǣ·յ͸IP㲥ַ206.121.73.255ķ󣬻Ϊǹ㲥飬Ұ̫㲥ַFF:FF:FF:FF:FF:FF:ӳ·Ͻյ÷飬Աей㲥
߿϶ܹ뵽ᷢʲôеƭԷIPַechoӦϢһܴ̫ΣԻ500ϵյechoлظ
ڶϵͳᾡشICMPϢWoodlly 
AttackerѷԴַΪĿϵͳЩĿϵͳܿͻᱻechoϢû׾ٵؾֹܹϵͳκ紫䣬ӶܾΪϵͳ
ֹӰĿϵͳӰĿ깫˾ӡվT3ӣ45MbpsĿϵͳڵĹ˾ʹõ·56Kbpsнù˾ͨѶֹͣ
ôηֹ͵ĹûԷֱԴվ㡢վĿվȡ裬SmurfӰ졣
(3).취

1.SmurfԴͷ
SmurfߵʹƭԴַechoûʹ··ķʱ֤ڲздϢкϷԴַԷֹֹʹƭԷ޷ҵվ㡣

2.Smurfķվ
ûѡSmurfķվ㡣һַԼ򵥵վechoǿԷֹЩ鵽Լ硣
վechoûҪԼ·㲥ַӳΪLAN㲥ַֹӳ̣ԼϵͳͲյЩecho
ʹCisco··ֹ㲥ӳΪLAN㲥ķLANӿڵģʽno ip directed-broadcast

ע⣺·LANӿڶʹøֻĳЩΧ·ʹá

(4).ֹSmurfĿվ
ûISPԸṩûԼѷֹSmurfԼWAN·ɵӰ졣ȻûԼ豸ִ䣬ڷֹSmurfеWANѾ̫ˡû԰SmurfӰΧ豸ϡͨʹö̬˼ʹ÷ǽûֹЩԼ硣ǽ״̬ЩỰǱзģ״̬¼ûecho¼ЩԴƭԹΪϢ
() .һЩDOS
: 
(1).Teardrop
TeardropIPķƬпܴڵ⣬ 
ˣڷǽϣͨرģ⡣ͬʱŲϵͳķչԽԽĲϵͳѾ𲽱ˡ 
(2)Land
LandһֱȽϾɵĹĿǰ󲿷ֲϵͳѾܹˡͨرնκĻӦҲֱӱֹķ 
(3)UDPˮ
UDPˮָʹUDPģʹæݱĵĻӦͬʱùռôʹ緱æ޷ 

. 10Էֲʽܾ񹥻йصĿٲȴʩ
-----------------------------------------------
ȫ©ȣȺ䷢ܾǺܸӵġ仰˵ûʲô򵥵ĵһĴʩԷֹƵĹöְȫͱֶֹĹЩϵͳĿǰܵвǣṩĿټ򵥵ķܻ- 
Mixter

ĿǰǱڵİûܾܺӦ飺
1)FUD
FUD־壨fearȷ(uncertainty)ͷ񶨣doubtĹ˳ΪĿܺĵķŭ벻侲ӦʶǣֻٲֵĹ˾пܳΪܾ񹥻ܺߡЩܻӭվ,еĵ֤ȯ˾IRCԼ־ΪԵĿģ㲻ǰЩģͲõĳΪDoSֱĿꡣ
2)Ļ·Ӧߣǣ
ЭֱҪ·Ӧ߲֮ǺҪġDdoSʹõĴǺܴԼһγԶǲܴġ·ȡϵȷǻʵַʿͬһʱͨĴͲͬԴַ£ӻȷʵڹ¼ػǵ·ɡ
3)Ż·ɺṹ
ӵеĲֹһһĻõ·СDoSвҪֹSYNûTCP鹦ܡļϸڿԴhttp://www.cisco.com·ɹӦ̵߻áЩ粻ҪUDPICMPϢرЩⷢ͵ICMPɵϢذûΣ
4)ŻҪĹʵ
ڿܳΪǱĿͬ顣ܾеķҪеķҪͨһѨһIPɺܴϰҽ㽫Լվ䵽϶ϣЩϵHTMLվֻתڡ
5)ڹڽʱȡʩ
׷ٰ׷ʾ籩ԴǵϵǺҪġҪ϶ЩԴַһDoSѡġܷȷαװ˵DoSԴȡĿٷӦΪ׷ٵ·ڻڴݰڡ
ĿǰѾǱڵıƣǰװЭûĳûӦҪ¡
6)FUD
ΪǱڵıֺߣӦЧĲȡʩǾšעĿǰľܾ񹥻ķ϶ΪLinuxSolarisд氲װġпֲܻ*BSD*ϵͳǸΪȫԲõĻʲô⡣
7)ȷûб
Ŀǰкܶõ©ϵ©ҲٴγˡϢݿ⣬securityfocus.compacketstorm.securify.comȷķİ汾Ƿ©ס߱ʹе©ϵͳװǵĳӦķҰȫ汾ңҲҪģҪҲٵķĳ̶ֳ˵ΪԼǰȫˡ
8)Եļϵͳ
ӦʶӦöԼϵͳͷϵͳе鸺ѧϰ㹻֪ʶ˽ϵͳķеģԵļõİȫԡ鿴ȫŵİȫվµ㽫ҪõĲϵͳͷ©ȱݡ
9)ʹüܼ
һȷûбǿƵϵͳУӦеĶƺϵͳļǩĵϵͳԵļЩļı仯һڲᱻԶ̹߷ʵǿƶýϴ洢ϵͳУ͡tripwirepacketstorm.securify.com͹ŵԴftpҵϲԲҵ;
10)ڱʱرϵͳ
ϵͳм⵽˹رϵͳҲýϵͳ϶ϿƵĹĻϳֵĻζŹ߼ȫĿȨӦжصͬ밲ȫCERT 
(www.cert.org)SANS 
(www.sans.org)ȡϵЩṩڿ㱻ƵµϢͬҪΪǻ¼¹Դ


Ҫ׶žܾ񹥻ֻ׷ԴȥҵڽйĻ͹ߡ 
Ҫ׷ٹ߲һ׵飬һֹͣ˹Ϊѽ䷢֡Ψһеķйʱ򣬸·Ϣ͹ݰһһݵķ乥ԴͷʱҪŵЭͬϲܺܺõɡ 
 뿴DoS Ӧüר⣬ۡ 
-
         ղشġ  Сӡرա
£DOSԭԼ

µ£DoS

Ѹ߳Ӱδɺͽ ͥ UbuntuĲLinuxWorld ӢضHavendale ϱųʷ 
ͼĶƵͼƼ   ѯʱ   ѯר(7ƪ)DoS Ӧü 
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