CVE-2016-4911 : The Fernet Token Provider in OpenStack Identity (Keystone) 9.0.x before 9.0.1 (m

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.

Published 2016-06-13 14:59:07

Updated 2025-04-12 10:46:41

Source MITRE

View at NVD, CVE.org

Products affected by CVE-2016-4911

Keystone » Openstack Identity » Version: 9.0.0.0 Update RC2
cpe:2.3:a:keystone:openstack_identity:9.0.0.0:rc2:*:*:*:*:*:*
Matching versions
Keystone » Openstack Identity » Version: 9.0.0.0 Update RC3
cpe:2.3:a:keystone:openstack_identity:9.0.0.0:rc3:*:*:*:*:*:*
Matching versions
Keystone » Openstack Identity » Version: 9.0.0.0 Update RC1
cpe:2.3:a:keystone:openstack_identity:9.0.0.0:rc1:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2016-4911

EPSS FAQ

0.21%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 40 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2016-4911

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.0	MEDIUM	AV:N/AC:L/Au:S/C:N/I:P/A:N	8.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
4.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	2.8	1.4	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: Low Availability: None

CWE ids for CVE-2016-4911

CWE-284 Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2016-4911

https://security.openstack.org/ossa/OSSA-2016-008.html

OpenStack Docs: OSSA-2016-008: Incorrect Audit IDs in Keystone Fernet Tokens can result in revocation bypass
Patch;Vendor Advisory
http://www.securityfocus.com/bid/90728

OpenStack Keystone CVE-2016-4911 Security Bypass Vulnerability
Third Party Advisory;VDB Entry
https://bugs.launchpad.net/keystone/+bug/1577558

Bug #1577558 “[OSSA 2016-008] v2.0 fernet tokens audit ids are i...” : Bugs : OpenStack Identity (keystone)
Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/05/17/10

oss-security - CVE request for vulnerability in OpenStack Keystone
Mailing List
http://www.openwall.com/lists/oss-security/2016/05/17/11

oss-security - Re: CVE request for vulnerability in OpenStack Keystone
Mailing List
https://review.openstack.org/#/c/311886/

Change Iffbaf505: Fix fernet audit ids for v2.0 | review.opendev Code Review
Vendor Advisory

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Vulnerability Details : CVE-2016-4911

Products affected by CVE-2016-4911

Exploit prediction scoring system (EPSS) score for CVE-2016-4911

CVSS scores for CVE-2016-4911

CWE ids for CVE-2016-4911

References for CVE-2016-4911