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Elasticsearch Directory Traversal

Elasticsearch Directory Traversal
Posted Apr 27, 2015
Authored by John Heasman

All Elasticsearch versions prior to 1.5.2 and 1.4.5 are vulnerable to a directory traversal attack that allows an attacker to retrieve files from the server running Elasticsearch.

tags | advisory, file inclusion
advisories | CVE-2015-3337
SHA-256 | e14bc9f35bf13a67b98981ea4b74e9432b3624b8a7bccf2d1aad94a07d646fee

Elasticsearch Directory Traversal

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Summary:
All Elasticsearch versions prior to 1.5.2 and 1.4.5 are vulnerable to a directory traversal attack that allows an attacker to retrieve files from the server running Elasticsearch. This vulnerability is not present in the initial installation of Elasticsearch. The vulnerability is exposed when a “site plugin” is installed. Elastic’s Marvel plugin and many community-sponsored plugins (e.g. Kopf, BigDesk, Head) are site plugins. Elastic Shield, Licensing, Cloud-AWS, Cloud-GCE, Cloud-Azure, the analysis plugins, and the river plugins are not site plugins.

We have been assigned CVE-2015-3337 for this issue.


Fixed versions:
Versions 1.5.2 and 1.4.5 have addressed the vulnerability.


Remediation:
Users should upgrade to 1.5.2 or 1.4.5. This will address the vulnerability and preserve site plugin functionality.

Users that do not want to upgrade can address the vulnerability in several ways, but these options will break any site plugin:
- Set “http.disable_sites” to true and restart the Elasticsearch node.
- Use a firewall or proxy to block HTTP requests to /_plugin.
- Uninstall all site plugins from all Elasticsearch nodes.


Credit:
John Heasman of DocuSign reported this issue.


CVSS
Overall CVSS score: 4.3
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