[CVE-2019-0201] Information disclosure vulnerability in Apache ZooKeeper

[Andor Molnar <andor () apache org>]

CVE-2019-0201: Information disclosure vulnerability in Apache ZooKeeper

Severity: Critical

Vendor: The Apache Software Foundation

Versions Affected: ZooKeeper prior to 3.4.14, ZooKeeper 3.5.0-alpha through 3.5.4-beta. The unsupported ZooKeeper 1.x 
through 3.3.x versions may be also affected.

Description: ZooKeeper’s getACL() command doesn’t check any permission when retrieves the ACLs of the requested node 
and returns all information contained in the ACL Id field as plaintext string. DigestAuthenticationProvider overloads 
the Id field with the hash value that is used for user authentication. As a consequence, if Digest Authentication is in 
use, the unsalted hash value will be disclosed by getACL() request for unauthenticated or unprivileged users.

Mitigation: Use an authentication method other than Digest (e.g. Kerberos) or upgrade to 3.4.14 or later (3.5.5 or 
later if on the 3.5 branch).

Credit: This issue was identified by Harrison Neal <harrison () patchadvisor com> PatchAdvisor, Inc.

References: https://issues.apache.org/jira/browse/ZOOKEEPER-1392