hacktracking: md5

Showing posts with label md5. Show all posts

# GynvaelEN mission 018

# curl 'http://gynvael.coldwind.pl/c3459750a432b7449b5619e967e4b82d90cfc971_mission018/admin.php?password1=240610708&password2=10932435112'
Welcome back dear admin.
Your flag: I'm not sure this is how equality is supposed to work.

Now try with <a href='superadmin.php'>superadmin.php</a>!

# curl 'http://gynvael.coldwind.pl/c3459750a432b7449b5619e967e4b82d90cfc971_mission018/superadmin.php'
...
if (hash("sha256", $_GET['password']) ==
'0e12345678901234567890123456789012345678901234567890123456789012')
...
_:)

Source

https://www.youtube.com/watch?v=adHOlKKbFXM (2:00:22)

References

https://www.whitehatsec.com/blog/magic-hashes/

# GynvaelEN mission 001

# wget https://github.com/dwyl/english-words/raw/master/words.txt
# grep '^........$' words.txt > wordlist.txt
# cat mission_001.py
import hashlib

solution = '76fb930fd0dbc6cba6cf5bd85005a92a'.decode('hex')

wh = {}

with open('wordlist.txt') as f:
 for word in f.read().splitlines():
  h = hashlib.md5(word).digest()
  wh[h] = word

for k, v in wh.iteritems():
 result = ''.join([chr(ord(b1)^ord(b2)) for b1,b2 in zip(k, solution)])
 if result in wh:
  print v, wh[result]
  break
# python mission_001.py
ambrosia virology

Source

https://www.youtube.com/watch?v=JhsHGms_7JQ (1:21:51)

# AlexCTF: RE4: unVM me - 250 pts

Decompilation

# uncompyle unvm_me.pyc > source.py
# cat source.py
import md5
md5s = [174282896860968005525213562254350376167L, 137092044126081477479435678296496849608L, 126300127609096051658061491018211963916L, 314989972419727999226545215739316729360L, 256525866025901597224592941642385934114L, 115141138810151571209618282728408211053L, 8705973470942652577929336993839061582L, 256697681645515528548061291580728800189L, 39818552652170274340851144295913091599L, 65313561977812018046200997898904313350L, 230909080238053318105407334248228870753L, 196125799557195268866757688147870815374L, 74874145132345503095307276614727915885L]
print 'Can you turn me back to python ? ...'
flag = raw_input('well as you wish.. what is the flag: ')
if len(flag) > 69:
    print 'nice try'
    exit()
if len(flag) % 5 != 0:
    print 'nice try'
    exit()
for i in range(0, len(flag), 5):
    s = flag[i:i + 5]
    if int('0x' + md5.new(s).hexdigest(), 16) != md5s[i / 5]:
        print 'nice try'
        exit()

print 'Congratz now you have the flag'

Generate the wordlist

# crunch 5 5 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz{} > md5.txt

Get the flag

# cat crack.py
import md5

imd5 = [174282896860968005525213562254350376167L, 137092044126081477479435678296496849608L, 126300127609096051658061491018211963916L, 314989972419727999226545215739316729360L, 256525866025901597224592941642385934114L, 115141138810151571209618282728408211053L, 8705973470942652577929336993839061582L, 256697681645515528548061291580728800189L, 39818552652170274340851144295913091599L, 65313561977812018046200997898904313350L, 230909080238053318105407334248228870753L, 196125799557195268866757688147870815374L, 74874145132345503095307276614727915885L]

hmd5 = []
for i in imd5:
 r = hex(i)[2:-1]
 if len(r) != 32:
  r = '0' + r
 hmd5.append(r)

with open("md5.txt", "r") as ins:
 for line in ins:
  line = line[:-1]
  m = md5.new(line).hexdigest()
  if m in hmd5:
   print line, hmd5.index(m)
for i in hmd5:
 print i

# python crack.py
1n52n 8
28n4b 11
43s8d 4
5d4s2 2
6v3k} 12
81h3d 10
8l6m1 5
ALEXC 0
TF{dv 1
ds9v4 7
n5l67 6
v37j4 9
vj8nk 3
ALEXCTF{dv5d4s2vj8nk43s8d8l6m1n5l67ds9v41n52nv37j481h3d28n4b6v3k}

# Wired 802.1x with MD5

Authentication server (Freeradius)

# apt-get install freeradius
# cat /etc/freeradius/clients.conf
client c2960_switch {
        ipaddr = 192.168.0.200
        secret = MYSECRET
}
# cat /etc/freeradius/users
"user1" Cleartext-Password := "PASSWORD1"
        Filter-Id = "user1_acl.in"

"user2" Cleartext-Password := "PASSWORD2"
        Tunnel-Type = VLAN,
        Tunnel-Medium-Type = IEEE-802,
        Tunnel-Private-Group-Id = 10

"000f1f8ce650" Cleartext-Password := "000f1f8ce650" # Supplicant's MAC address
        Tunnel-Type = VLAN,
        Tunnel-Medium-Type = IEEE-802,
        Tunnel-Private-Group-Id = 11
# cat /etc/freeradius/radiusd.conf
prefix = /usr
exec_prefix = /usr
sysconfdir = /etc
localstatedir = /var
sbindir = ${exec_prefix}/sbin
logdir = /var/log/freeradius
raddbdir = /etc/freeradius
radacctdir = ${logdir}/radacct
name = freeradius
confdir = ${raddbdir}
run_dir = ${localstatedir}/run/${name}
db_dir = ${raddbdir}
libdir = /usr/lib/freeradius
pidfile = ${run_dir}/${name}.pid
user = freerad
group = freerad
max_request_time = 30
cleanup_delay = 5
max_requests = 1024
listen {
        type = auth
        ipaddr = *
        port = 0
}
listen {
        ipaddr = *
        port = 0
        type = acct
}
hostname_lookups = no
allow_core_dumps = no
regular_expressions     = yes
extended_expressions    = yes
log {
        destination = files
        file = ${logdir}/radius.log
        syslog_facility = daemon
        stripped_names = no
        auth = no
        auth_badpass = no
        auth_goodpass = no
}
checkrad = ${sbindir}/checkrad
security {
        max_attributes = 200
        reject_delay = 1
        status_server = yes
}
proxy_requests  = yes
$INCLUDE proxy.conf
$INCLUDE clients.conf
thread pool {
        start_servers = 5
        max_servers = 32
        min_spare_servers = 3
        max_spare_servers = 10
        max_requests_per_server = 0
}
modules {
        $INCLUDE ${confdir}/modules/
        $INCLUDE eap.conf
}
instantiate {
        exec
        expr
        expiration
        logintime
}
$INCLUDE policy.conf
$INCLUDE sites-enabled/
# mkdir /var/log/freeradius/radacct
# chown freerad:freerad /var/log/freeradius/radacct
# cat /etc/freeradius/sites-enabled/default
authorize {
        preprocess
        chap
        mschap
        digest
        suffix
        eap {
                ok = return
        }
        files
        expiration
        logintime
        pap
}
authenticate {
        Auth-Type PAP {
                pap
        }
        Auth-Type CHAP {
                chap
        }
        Auth-Type MS-CHAP {
                mschap
        }
        digest
        unix
        eap
}
preacct {
        preprocess
        acct_unique
        suffix
        files
}
accounting {
        detail
        unix
        radutmp
        exec
        attr_filter.accounting_response
}
session {
        radutmp
}
post-auth {
        exec
        Post-Auth-Type REJECT {
                attr_filter.access_reject
        }
}
pre-proxy {
}
post-proxy {
        eap
}

# /etc/init.d/freeradius stop
# freeradius -X

Authenticator/NAS (Cisco Catalyst 2960)

Switch(config)# aaa new-model
Switch(config)# radius server freeradius
Switch(config-radius-server)# address ipv4 192.168.0.100 auth-port 1812 acct-port 1813
Switch(config-radius-server)# key MYSECRET
Switch(config)# aaa authentication dot1x default group radius
Switch(config)# aaa authorization network default group radius
Switch(config)# aaa accounting dot1x default start-stop group radius
Switch(config)# radius-server vsa send accounting
Switch(config)# radius-server vsa send authentication
Switch(config)# interface FastEthernet0/10
Switch(config-if)# switchport mode access
Switch(config-if)# authentication event fail retry 0 action authorize vlan 30
Switch(config-if)# authentication event no-response action authorize vlan 20
Switch(config-if)# authentication port-control auto
Switch(config-if)# mab eap
Switch(config-if)# dot1x pae authenticator
Switch(config-if)# dot1x timeout tx-period 1
Switch(config-if)# spanning-tree portfast
Switch(config)# ip access-list extended user1_acl
Switch(config-ext-nacl)#  permit icmp any host 192.168.0.100
Switch# test aaa group radius user1 PASSWORD1 legacy
Switch# !debug dot1x

Supplicant (Windows XP)

C:\> net start "Wired Autoconfig"

NIC > Properties > Authentication
- Enable IEEE 802.1x authentication for this network
- EAP type: MD5-Challenge

References

http://en.wikipedia.org/wiki/IEEE_802.1X
http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/Dot1X_Deployment/Dot1x_Dep_Guide.html

# Reto contraseñas postgres (md5, salt)

Introducción

En el reto 'networking 3' del wargame de sbd 2011 proporcionan un pcap con el proceso de autenticación contra una base de datos postgres.
Usuario: postgres
Salt: 0e5da2d1
Contraseña: 6fcd671f668c3c8efca3308f6f41bd17

Ejecución

# cat diccionario.txt
hack
tracking
Jixi
wargame
# cat postgres_md5_salt.sh
#!/bin/bash

function hex2ascii {
 printf %s $1 | xxd -r -p
}
function md5 {
 printf %s $1 | md5sum | cut -d ' ' -f1
}

user=$1
salt=`hex2ascii $2`
password_file=$3
captured_password=$4

while read secret
do
 hash_stage_1=`md5 $secret$user`
 #echo $hash_stage_1
 generated_password=`md5 $hash_stage_1$salt`
 #echo $generated_password
 if [ $generated_password == $captured_password ]
 then
  echo "$secret --> $captured_password"
 fi
done < $password_file
# ./postgres_md5_salt.sh postgres 0e5da2d1 \
diccionario.txt \
6fcd671f668c3c8efca3308f6f41bd17
Jixi --> 6fcd671f668c3c8efca3308f6f41bd17