Exposure of Sensitive Information to an Unauthorized Actor
The package etcd is a distributed key-value store for the data of a distributed system. In versions prior to 3.4.26, 3.5.x prior to 3.5.9, and 3.6.0-alpha.0 the "LeaseTimeToLive" API allows access to key names (not value) associated with a lease when "Keys" parameter is true, even a user doesn't have read permission to the keys. The impact is limited to a cluster that enables auth (RBAC).
CWE-200 - Information Exposure
An information exposure vulnerability is categorized as an information flow (IF) weakness, which can potentially allow unauthorized access to otherwise classified information in the application, such as confidential personal information (demographics, financials, health records, etc.), business secrets, and the application's internal environment.