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Hacking Attacks on Elasticsearch and MongoDB

Ongoing hacking attack has deleted all data from over 4,000 unsecure databases. Threat is called the Meow Attack.

Image of a cat scratching a persons face, a metaphor for the "meow" database hacking attacks

Unsecured Elasticsearch and MongoDB databases have been targeted in hacking attacks that erase all data. There are no ransom demands.

These are being called Meow Attacks because they leave a telltale meow signature on server log files.

Close up of a screenshot of a log file of a server that was attacked by the Meow

Security researcher Bob Diachenko (@MayhemDayOne)  linked to a tweet by Anthr@X (@anthrax0) that was said to represent a screenshot of a log file showing details of a meow attack.

Screenshot of a log file posted on twitterClose up of a screenshot of a log file from an attacked server that was posted on Twitter.

Meow Hacking Attacks

The attacks are targeting unsecured installations of Elasticsearch and MongoDB.

That may mean installations that are not protected by a firewall and are exposed to the public.

That also could be installations that do not have SSL encyrpted communications.

The Elasticsearch hacking attack was noted by security research Bob Chiachenko on July 20, 2020. He noted there were no ransom requests or warnings.

It was an attack designed solely to delete all data.

The latest high level attack victim is an African online payment service.

Automated Hacking Attacks

In general, hacking attacks are automated. A bot script attacks a site by probing for known vulnerabilities such as unsecured ports and vulnerable files. The process is similar to a thief walking down a street checking door handles for unlocked vehicles.

The meow attack is also an automated attack.

What is Being Attacked

Right now, it is unsecured Elasticsearch and MongoDB databases that are being attacked.

Elasticsearch is being attacked the most, followed by MongoDB.

As of July 24, 2020, there were 1,779 Elasticsearch and 701 MongoDB attacks.

Elasticsearch is an open source search and analytics service that is used by companies such as Uber, Shopify and Udemy.

MongoDB states on their website that it is used by companies such as eBay, Adobe, SquareSpace, Verizon and the UK government.

Attacks Alleged to be Hidden by a VPN

Someone on Twitter posted log file screenshots of a Mongo database attack that showed the attacks on that server were going through a VPN IP address in order to hide the true origin of the attack.

ProtonVPN is a virtual private network (VPN). A VPN is a service that masks a users true IP address for security purposes. In some countries they are used to mask their Internet activities from prying governments.

ProtonVPN responded via Twitter by pledging to review the activity and block malicious users who are violating their terms and conditions.

Action Recommended

There are security plugins for Elasticsearch:

It may be prudent for publishers running Elasticsearch or MongoDB to consider reviewing their installations to ascertain they are secure and not exposed to the public Internet.


New ‘Meow’ attack has Deleted Almost 4,000 Unsecured Databases

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SEJ STAFF Roger Montti Owner - at

I have 25 years hands-on experience in SEO and have kept on  top of the evolution of search every step ...

Hacking Attacks on Elasticsearch and MongoDB

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