OpenStack Keystone EC2-style tokens security bypass

keystone-cve20136391-sec-bypass (89657) The risk level is classified as MediumMedium Risk

Description:

OpenStack Keystone could allow a remote attacker to bypass security restrictions, caused by an error within the ec2tokens API when generating EC2 credentials. An attacker could exploit this vulnerability to gain access to otherwise restricted trustor's roles.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Upgrade to the latest version of OpenStack Keystone (2013.2.1 or later), available from the OpenStack Keystone Web site. See References.

References:

  • OpenStack Keystone Web Site: OpenStack Keystone.
  • oss-sec Mailing List, Wed, 11 Dec 2013 15:43:15 +0000: Keystone trust circumvention through EC2-style tokens (CVE-2013-6391).
  • OSSA 2013-032: Keystone trust circumvention through EC2-style tokens (CVE-2013-6391).
  • BID-64253: OpenStack Keystone EC2-style Tokens Validation Privilage Escalation Vulnerability
  • CVE-2013-6391: The ec2tokens API in OpenStack Identity (Keystone) before Havana 2013.2.1 and Icehouse before icehouse-2 does not return a trust-scoped token when one is received, which allows remote trust users to gain privileges by generating EC2 credentials from a trust-scoped token and using them in an ec2tokens API request.
  • SA56079: OpenStack Keystone EC2 Tokens Security Bypass Security Issue

Platforms Affected:

  • OpenStack Keystone 2013.2

Reported:

Dec 11, 2013

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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