CVE-2017-12635

Summary

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 Software

VendorProductVersion RangeStatus
Apache Software FoundationApache CouchDB1.2.0 to 1.6.1affected
Apache Software FoundationApache CouchDB2.0.0 to 2.1.0affected

Weaknesses

  • Information Disclosure

ADP Enrichment

CVE Program Container

Additional References

References