REDHAT-BUG-2328637: Medium severity Apache Zookeeper vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of REDHAT-BUG-2328637?
REDHAT-BUG-2328637 is classified as a medium severity vulnerability due to information disclosure risks.
How do I fix REDHAT-BUG-2328637?
To fix REDHAT-BUG-2328637, upgrade Apache ZooKeeper to version 3.9.2 or later to ensure proper ACL checks.
What should I do if I cannot upgrade Apache ZooKeeper for REDHAT-BUG-2328637?
If an upgrade is not possible, restrict access to ZooKeeper instances and monitor logs for suspicious activity as a temporary measure.
What versions of Apache ZooKeeper are affected by REDHAT-BUG-2328637?
REDHAT-BUG-2328637 affects Apache ZooKeeper versions from 3.8.4 up to, but not including, 3.9.2.
Can REDHAT-BUG-2328637 be exploited remotely?
Yes, an attacker with access to a parent znode can exploit REDHAT-BUG-2328637 remotely by adding a persistent watcher.