Cloudanix VulnDB

CVE-2017-12635

Critical · 9.8

CVSS

9.8

EPSS

99.8%

Published

Nov 14, 2017

CISA due date

—

The record

Due to differences in the Erlang-based JSON parser and JavaScript-based JSON parser, it is possible in Apache CouchDB before 1.7.0 and 2.x before 2.1.1 to submit _users documents with duplicate keys for 'roles' used for access control within the database, including the special case '_admin' role, that denotes administrative users. In combination with CVE-2017-12636 (Remote Code Execution), this can be used to give non-admin users access to arbitrary shell commands on the server as the database system user. The JSON parser differences result in behaviour that if two 'roles' keys are available in the JSON, the second one will be used for authorising the document write, but the first 'roles' key is used for subsequent authorization for the newly created user. By design, users can not assign themselves roles. The vulnerability allows non-admin users to give themselves admin privileges.

Affected packages

Ecosystem Package Introduced Fixed
Debian:7 couchdb 0 1.2.0-5+deb7u1
Ubuntu:16.04:LTS couchdb 0 No fix
Ubuntu:Pro:16.04:LTS couchdb 0 No fix

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