Package Instance

etcd Key name can be accessed via LeaseTimeToLive API
### Impact
LeaseTimeToLive API allows access to key names (not value) associated to 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 which enables auth (RBAC).

### Patches
< v3.4.26 and < v3.5.9 are affected.

### Workarounds
No.

### Reporter
Yoni Rozenshein

Etcd-io Improper Authentication vulnerability
Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.

This has been fixed in v.[3.5.8](https://github.com/etcd-io/etcd/blob/main/CHANGELOG/CHANGELOG-3.5.md#etcd-server) and was also backported to [3.4](https://github.com/etcd-io/etcd/pull/15655) and [3.5](https://github.com/etcd-io/etcd/pull/15653).

DNS Rebinding in etcd
DNS rebinding vulnerability found in etcd 3.3.1 and earlier. An attacker can control his DNS records to direct to localhost, and trick the browser into sending requests to localhost (or any other address).

etcd Cross-site Request Forgery (CSRF)
A cross-site request forgery flaw was found in etcd 3.3.1 and earlier. An attacker can set up a website that tries to send a POST request to the etcd server and modify a key. Adding a key is done with PUT so it is theoretically safe (can't PUT from an HTML form or such) but POST allows creating in-order keys that an attacker can send.