CVE-2017-12635 : What You Need to Know

Apache CouchDB versions before 1.7.0 and 2.x before 2.1.1 are vulnerable to a security flaw due to discrepancies in JSON parsing mechanisms.

Understanding CVE-2017-12635

This CVE highlights a vulnerability in Apache CouchDB that allows non-admin users to grant themselves administrative privileges.

What is CVE-2017-12635?

The vulnerability arises from differences between the Erlang-based and JavaScript-based JSON parsers, enabling users to manipulate '_users' documents to gain unauthorized access.

The Impact of CVE-2017-12635

Non-admin users can execute arbitrary shell commands on the server under the guise of the database system user.
Unauthorized users can assign themselves administrative roles, compromising database security.

Technical Details of CVE-2017-12635

Apache CouchDB's vulnerability can have severe consequences due to the exploitation of JSON parsing discrepancies.

Vulnerability Description

Users can insert duplicate keys for 'roles' in '_users' documents, granting unauthorized access.

Affected Systems and Versions

Apache CouchDB versions 1.2.0 to 1.6.1 and 2.0.0 to 2.1.0 are impacted.

Exploitation Mechanism

The second occurrence of the 'roles' key is used for document write authorization, allowing non-admin users to assign themselves admin privileges.

Mitigation and Prevention

To address CVE-2017-12635, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Update Apache CouchDB to versions 1.7.0 or 2.1.1 to mitigate the vulnerability.
Monitor and restrict user access to prevent unauthorized role assignments.

Long-Term Security Practices

Regularly review and update access control policies within Apache CouchDB.
Educate users on secure document management practices to prevent unauthorized access.

Patching and Updates

Apply security patches provided by Apache Software Foundation to address the JSON parsing vulnerability.