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Ubuntu Security Notice USN-4480-1
September 01, 2020

keystone vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in OpenStack Keystone.

Software Description:
- keystone: OpenStack identity service

Details:

It was discovered that OpenStack Keystone incorrectly handled EC2
credentials. An authenticated attacker with a limited scope could possibly
create EC2 credentials with escalated permissions. (CVE-2020-12689,
CVE-2020-12691)

It was discovered that OpenStack Keystone incorrectly handled the list of
roles provided with OAuth1 access tokens. An authenticated user could
possibly end up with more role assignments than intended. (CVE-2020-12690)

It was discovered that OpenStack Keystone incorrectly handled EC2 signature
TTL checks. A remote attacker could possibly use this issue to reuse
Authorization headers. (CVE-2020-12692)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  keystone                        2:13.0.4-0ubuntu1
  python-keystone                 2:13.0.4-0ubuntu1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4480-1
  CVE-2020-12689, CVE-2020-12690, CVE-2020-12691, CVE-2020-12692

Package Information:
  https://launchpad.net/ubuntu/+source/keystone/2:13.0.4-0ubuntu1