.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
.. use this file except in compliance with the License. You may obtain a copy of
.. the License at
..
..   http://www.apache.org/licenses/LICENSE-2.0
..
.. Unless required by applicable law or agreed to in writing, software
.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
.. License for the specific language governing permissions and limitations under
.. the License.

.. _cve/2023-26268:

=========================================================================
CVE-2023-26268: Apache CouchDB: Information sharing via couchjs processes
=========================================================================

:Date: 02.05.2023

:Affected: 3.3.1 and below, 3.2.2 and below

:Severity: Medium

:Vendor: The Apache Software Foundation

Description
===========

Design documents with matching document IDs, from databases on the same
cluster, may share a mutable Javascript environment when using these design
document functions:

  * validate_doc_update
  * list
  * filter
  * filter views (using view functions as filters)
  * rewrite
  * update

This doesn't affect map/reduce or search (Dreyfus) index functions.

Mitigation
==========

CouchDB :ref:`3.3.2 <release/3.3.2>` and :ref:`3.2.3 <release/3.2.3>` and
onwards matches Javascript execution processes by database names in addition to
design document IDs when processing the affected design document functions.

Workarounds
===========

Avoid using design documents from untrusted sources which may attempt to cache
or store data in the Javascript environment.

Credit
======

This issue was identified by `Nick Vatamaniuc`_

.. _Nick Vatamaniuc: https://home.apache.org/phonebook.html?uid=vatamane