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.
Metrics
Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: apache
Published: 2017-11-14T20:00:00Z
Updated: 2024-09-17T01:31:53.828Z
Reserved: 2017-08-07T00:00:00
Link: CVE-2017-12635
Vulnrichment
No data.
NVD
Status : Modified
Published: 2017-11-14T20:29:00.200
Modified: 2024-11-21T03:09:56.480
Link: CVE-2017-12635
Redhat
No data.