title: Apache ZooKeeper: Information disclosure in persistent watcher handling
description: Information disclosure in persistent watchers handling in Apache ZooKeeper due to missing ACL check. It allows an attacker to monitor child znodes by attaching a persistent watcher (addWatch command) to a parent which the attacker has already access to. ZooKeeper server doesn't do ACL check when the persistent watcher is triggered and as a consequence, the full path of znodes that a watch event gets triggered upon is exposed to the owner of the watcher. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical.
Users are recommended to upgrade to version 3.9.2, 3.8.4 which fixes the issue.
problem types: CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
affected:
{
collectionURL: https://repo.maven.apache.org/maven2
defaultStatus: unaffected
packageName: org.apache.zookeeper:zookeeper
product: Apache ZooKeeper
vendor: Apache Software Foundation
versions:
lessThanOrEqual: 3.9.1, status: affected, version: 3.9.0, versionType: maven
lessThanOrEqual: 3.8.3, status: affected, version: 3.8.0, versionType: maven
lessThanOrEqual: 3.7.2, status: affected, version: 3.6.0, versionType: maven
}
metrics:
other: [
content: {'text': 'critical'}
type: Textual description of severity
]