A keystone security update has been released for Debian GNU/Linux 10.

DSA 4679-1: keystone security update

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Debian Security Advisory DSA-4679-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 06, 2020   https://www.debian.org/security/faq
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Package : keystone
CVE ID : not yet available
Debian Bug : 959900

A vulnerability was found in the EC2 credentials API of Keystone, the
OpenStack identity service: Any user authenticated within a limited
scope (trust/oauth/application credential) could create an EC2 credential
with an escalated permission, such as obtaining "admin" while
the user is on a limited "viewer" role.

For the stable distribution (buster), this problem has been fixed in
version 2:14.2.0-0+deb10u1.

We recommend that you upgrade your keystone packages.

For the detailed security status of keystone please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/keystone

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/