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Vulnerability of Elasticsearch: Cross Site Scripting via X-Pack Machine Learning

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting via X-Pack Machine Learning of Elasticsearch, in order to run JavaScript code in the context of the web site.
Vulnerable products: Elasticsearch.
Severity of this weakness: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 18/04/2018.
Références of this bulletin: CVE-2018-3823, CVE-2018-3824, VIGILANCE-VUL-25908.

Description of the vulnerability 

The Elasticsearch product offers a web service.

However, it does not filter received data via X-Pack Machine Learning before inserting them in generated HTML documents.

An attacker can therefore trigger a Cross Site Scripting via X-Pack Machine Learning of Elasticsearch, in order to run JavaScript code in the context of the web site.
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This security bulletin impacts software or systems such as Elasticsearch.

Our Vigil@nce team determined that the severity of this cybersecurity announce is medium.

The trust level is of type confirmed by the editor, with an origin of document.

This bulletin is about 2 vulnerabilities.

An attacker with a expert ability can exploit this vulnerability alert.

Solutions for this threat 

Elasticsearch: version 6.2.4.
The version 6.2.4 is fixed:
  https://www.elastic.co/downloads/past-releases

Elasticsearch: version 5.6.9.
The version 5.6.9 is fixed:
  https://www.elastic.co/downloads/past-releases
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