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1、,1,Cyber-crime investigative techniques,LIN YING,2,Chapter2 Network attack model,3,2.1 Overview,Attacks hidden identity and location Objective information collection system Weaknesses of Information Mining The use of authority to target,Attacks hidden The attack Open up the back door Remove traces o

2、f attacks,Network attacks usually divided into the following stages:,4,2.2 Attacks hidden identity and location,Objective: To hide the identity of network attacks and the host location 1) The mainframe was used as a springboard for the invasion;,5,2) Application telephone adapter technology hidden i

3、dentity of the attacker; 3) Others ACCOUNT Internet piracy; 4) Gateway through the free agent attacks; 5) fake user accounts; 6) forged IP addresses.,6,2.1.1.1 Relations of trust In Unix mainframe, there is a special relationship of trust. Assume that two hosts A and B, above have an account admin,

4、mainframe A and B to admin as two unrelated users, in different host operating need to import the corresponding accounts (although these two accounts are for admin), which is extremely inconvenient. In order to reduce this inconvenience can host mainframe A and B in the two accounts established rela

5、tionship of trust, of the specific steps are as follows:,2.2.1 IP Spoofing,7,1)In the mainframe A and B on the admin console the home directory creation. Rhosts file; 2)host of admin in the home directory using the commands A, B relationship of trust: # echo “B admin” /.rhosts;,8,2.1.1.2 The theoret

6、ical basis for IP Spoofing IP deceive most fundamental theoretical basis: Since A and B is the relationship of trust between the established based on the IP address, then pretending to B if the IP address, they can use rlogin logged on A, without the need for any password verification.,9,IP deceived

7、 by the composition of a number of steps: 1、Trust was host to a standstill: 2、Speculation of sampling and sequencing:,2.1.1.3 The whole process of IP Spoofing,10,2.3 Objective information collection system,Objective: To determine the target and collect the relevant information system goals,11,2.3.1

8、Scanner related knowledge,2.3.1.1 What is scanner Scanner is a system of information through the collection to automatically detect remote or local host security vulnerability procedures. Through the use of scanners, remote server can be found the various TCP port and the distribution of the service

9、s provided and their version of the software, which allows hackers or caretakers indirectly or directly that the existence of long-range mainframe security issues.,12,2.3.1.2 classification The use of scanners in accordance with the different objects can be divided into local and long-range scanners

10、 scanners; In accordance with the purpose to scan classification, can be divided into port scanners and vulnerability scanner.,13,/*包含一些网络调用和系统调用的头文件*/ #include #include #include #include #include #include ,int main(int argc,char *argv) int probeport=0; struct hostent host;/*定义socket主机结构*/ int err,i

11、, net; struct sockaddr_in sa;/*socket地址结构*/ if (argc!=2) printf(“用法:%s hostnamen”,argv0); exit(1); ,for (i:=1;ih_addr,sizeof sa.sin_addr); else herror(argv1); exit(2); ,sa.sin_port=htons(i);/*本次扫描的端口号*/ net=socket(AF_INET,SOCKET_ATREAM,0); /*建立一个socket套接字*/ if(net0) perror(nsocket”); exit(2); err=co

12、nnect(net,(struct sockaddr) /*连接到本端口*/,if (err0) printf(“%s%-5d%sr”,argv1,i,strerror(errno); /*如果端口关闭则显示*/ fflush(stdout); else printf(“%s%-5d accepted.n”,argv1,i); /*开放的端口显示*/,if (shutdown(net,2)0) perror(“shutdown”); exit(2); close(net);/*关闭连接*/ printf(“r”); fflush(stdout); return(0); ,19,2.4 Weak

13、nesses of Information Mining,Objective: The objective of the information collected can be used in the extraction of information loopholes. Commonly used to the weakness of mining methods are as follows: System or application service software vulnerabilities,20,Mainframe relationship of trust loophol

14、e An attacker could exploit the loopholes CGI, read / etc / hosts.allow and other documents through these documents, an attacker can generally understand the relationship of trust between the mainframe and then detecting these trust, what are the loopholes mainframe.,21,2.5 The use of authority to target,Objective: To access the target system privileges ordinary account or competence.,22,2.6 Attacks hidden,Objective: hidden in the target operating system, was found to prevent attacks,23,2.7 Attack,Objective: To attack or target system to other systems as a

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