Vulnerability CVE-2016-4911
Published: 2016-06-13

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.

CVSS2 => (AV:N/AC:L/Au:S/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4/10
2.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Openstack project -> Openstack identity 

 References:
https://security.openstack.org/ossa/OSSA-2016-008.html
https://review.openstack.org/#/c/311886/
https://bugs.launchpad.net/keystone/+bug/1577558
http://www.openwall.com/lists/oss-security/2016/05/17/11
http://www.openwall.com/lists/oss-security/2016/05/17/10
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