9200 - Pentesting Elasticsearch
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Elasticsearch is a distributed, open source search and analytics engine for all types of data. It is known for its speed, scalability, and simple REST APIs. Built on Apache Lucene, it was first released in 2010 by Elasticsearch N.V. (now known as Elastic). Elasticsearch is the core component of the Elastic Stack, a collection of open source tools for data ingestion, enrichment, storage, analysis, and visualization. This stack, commonly referred to as the ELK Stack, also includes Logstash and Kibana, and now has lightweight data shipping agents called Beats.
An Elasticsearch index is a collection of related documents stored as JSON. Each document consists of keys and their corresponding values (strings, numbers, booleans, dates, arrays, geolocations, etc.).
Elasticsearch uses an efficient data structure called an inverted index to facilitate fast full-text searches. This index lists every unique word in the documents and identifies the documents in which each word appears.
During the indexing process, Elasticsearch stores the documents and constructs the inverted index, allowing for near real-time searching. The index API is used to add or update JSON documents within a specific index.
Default port: 9200/tcp
The protocol used to access Elasticsearch is HTTP. When you access it via HTTP you will find some interesting information: http://10.10.10.115:9200/
If you don't see that response accessing / see the following section.
By default Elasticsearch doesn't have authentication enabled, so by default you can access everything inside the database without using any credentials.
You can verify that authentication is disabled with a request to:
However, if you send a request to / and receives a response like the following one:
That will means that authentication is configured an you need valid credentials to obtain any info from elasticserach. Then, you can try to bruteforce it (it uses HTTP basic auth, so anything that BF HTTP basic auth can be used). Here you have a list default usernames: elastic (superuser), remote_monitoring_user, beats_system, logstash_system, kibana, kibana_system, apm_system, _anonymous_._ Older versions of Elasticsearch have the default password changeme for this user
Here are some endpoints that you can access via GET to obtain some information about elasticsearch:
/_cat/segments
/_cluster/allocation/explain
/_security/user
/_cat/shards
/_cluster/settings
/_security/privilege
/_cat/repositories
/_cluster/health
/_security/role_mapping
/_cat/recovery
/_cluster/state
/_security/role
/_cat/plugins
/_cluster/stats
/_security/api_key
/_cat/pending_tasks
/_cluster/pending_tasks
/_cat/nodes
/_nodes
/_cat/tasks
/_nodes/usage
/_cat/templates
/_nodes/hot_threads
/_cat/thread_pool
/_nodes/stats
/_cat/ml/trained_models
/_tasks
/_cat/transforms/_all
/_remote/info
/_cat/aliases
/_cat/allocation
/_cat/ml/anomaly_detectors
/_cat/count
/_cat/ml/data_frame/analytics
/_cat/ml/datafeeds
/_cat/fielddata
/_cat/health
/_cat/indices
/_cat/master
/_cat/nodeattrs
/_cat/nodes
These endpoints were taken from the documentation where you can find more.
Also, if you access /_cat the response will contain the /_cat/* endpoints supported by the instance.
In /_security/user (if auth enabled) you can see which user has role superuser.
You can gather all the indices accessing http://10.10.10.115:9200/_cat/indices?v
To obtain information about which kind of data is saved inside an index you can access: http://host:9200/<index> from example in this case http://10.10.10.115:9200/bank
If you want to dump all the contents of an index you can access: http://host:9200/<index>/_search?pretty=true like http://10.10.10.115:9200/bank/_search?pretty=true
Take a moment to compare the contents of the each document (entry) inside the bank index and the fields of this index that we saw in the previous section.
So, at this point you may notice that there is a field called "total" inside "hits" that indicates that 1000 documents were found inside this index but only 10 were retried. This is because by default there is a limit of 10 documents.
But, now that you know that this index contains 1000 documents, you can dump all of them indicating the number of entries you want to dump in the size parameter: http://10.10.10.115:9200/quotes/_search?pretty=true&size=1000asd
Note: If you indicate bigger number all the entries will be dumped anyway, for example you could indicate size=9999 and it will be weird if there were more entries (but you should check).
In order to dump all you can just go to the same path as before but without indicating any indexhttp://host:9200/_search?pretty=true like http://10.10.10.115:9200/_search?pretty=true
Remember that in this case the default limit of 10 results will be applied. You can use the size parameter to dump a bigger amount of results. Read the previous section for more information.
If you are looking for some information you can do a raw search on all the indices going to http://host:9200/_search?pretty=true&q=<search_term> like in http://10.10.10.115:9200/_search?pretty=true&q=Rockwell
If you want just to search on an index you can just specify it on the path: http://host:9200/<index>/_search?pretty=true&q=<search_term>
Note that the q parameter used to search content supports regular expressions
You can also use something like https://github.com/misalabs/horuz to fuzz an elasticsearch service.
You can check your write permissions trying to create a new document inside a new index running something like the following:
That cmd will create a new index called bookindex with a document of type books that has the attributes "bookId", "author", "publisher" and "name"
Notice how the new index appears now in the list:
And note the automatically created properties:
Some tools will obtain some of the data presented before:
port:9200 elasticsearch
Get a hacker's perspective on your web apps, network, and cloud
Find and report critical, exploitable vulnerabilities with real business impact. Use our 20+ custom tools to map the attack surface, find security issues that let you escalate privileges, and use automated exploits to collect essential evidence, turning your hard work into persuasive reports.
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