CVE-2016-4911 OpenStack Identity Keystone Improper Access Control
Remote authenticated users can bypass access restrictions and prevent token revocation by rescoping tokens in OpenStack Keystone.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-4911?
CVE-2016-4911 is a medium-severity authentication bypass vulnerability in n/a, published on 13 Jun 2016. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Fernet Token Provider in OpenStack Identity (Keystone) 9.0.x before 9.0.1 (mitaka) allows remote authenticated users to prevent revocation of a chain of tokens and bypass intended access restrictions by rescoping a token.
Weakness: CWE-284
Which versions are affected by CVE-2016-4911?
3 open source packages ship an affected version, including keystone. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
keystone PyPI | From 9.0.0 | 9.0.1 |
keystone PyPI | From 9.0.0 | 9.0.1 |
keystone PyPI | From 9.0.0 | 9.0.1 |
Products include Keystone Openstack Identity.
How do I fix CVE-2016-4911?
Upgrade keystone to 9.0.1 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2016-4911 being exploited?
There is no known exploitation of CVE-2016-4911 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2016-4911, GHSA-f82m-w3p3-cgp3, PYSEC-2016-38.