Improperly configured #HDFS -based servers, mostly #Hadoop installs, are exposing over five petabytes of information, according to John Matherly, founder of Shodan, a search engine for discovering Internet-connected devices. The expert says he discovered 4,487 instances of HDFS-based servers available via public IP addresses and without authentication, which in total exposed over 5,120 TB of data. According to Matherly, 47,820 #MongoDB servers exposed only 25 TB of data. To put things in perspective, HDFS servers leak 200 times more data compared to MongoDB servers, which are ten times more prevalent. A report from Binary Edge from 2015 revealed that at the time, Redis, MongoDB, Memcached, and ElasticSearch servers put together exposed a tota of only 1.1 PB of data.
https://www.bleepingcomputer.com/news/security/hadoop-servers-expose-over-5-petabytes-of-data/
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