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From Jihoon Son <jihoon...@apache.org>
Subject CVE-2021-26920: Apache Druid: The HTTP inputSource allows authenticated users to read data from other sources than intended
Date Fri, 02 Jul 2021 03:22:35 GMT
Severity: low


In the Druid ingestion system, the InputSource is used for reading data from a certain data
source. However, the HTTP InputSource allows authenticated users to read data from other sources
than intended, such as the local file system, with the privileges of the Druid server process.
This is not an elevation of privilege when users access Druid directly, since Druid also provides
the Local InputSource, which allows the same level of access. But it is problematic when users
interact with Druid indirectly through an application that allows users to specify the HTTP
InputSource, but not the Local InputSource. In this case, users could bypass the application-level
restriction by passing a file URL to the HTTP InputSource.


Users can avoid the issue by upgrading to 0.21.0 or a higher version.

In an earlier version than 0.21.0, when the user application wants to restrict the access
to the local file system, it should disallow all InputSources that can read local files, that
is the Local, HTTP, and HDFS InputSources.


This issue was discovered by chybeta from the Security Team of Alibaba Cloud.

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