[USN-7926-1] OpenStack Keystone vulnerabilities

[noreply+usn-bot at canonical.com]

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Ubuntu Security Notice USN-7926-1
December 11, 2025

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

- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in OpenStack Keystone.

Software Description:
- keystone: OpenStack identity service

Details:

Kay discovered that OpenStack Keystone incorrectly handled the ec2tokens
and s3tokens APIs. A remote attacker could possibly use this issue to
obtain unauthorized access and escalate privileges. (CVE-2025-65073)

It was discovered that OpenStack Keystone only validated the first 72
bytes of an application secret. An attacker could possibly use this issue
to bypass password complexity. (CVE-2021-3563)

It was discovered that OpenStack Keystone had a time lag before a token
should be revoked by the security policy. A remote administrator could use
this issue to maintain access for longer than expected. (CVE-2022-2447)

Update instructions:

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

Ubuntu 22.04 LTS
  keystone                        2:21.0.1-0ubuntu2.1
  python3-keystone                2:21.0.1-0ubuntu2.1

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

References:
  https://ubuntu.com/security/notices/USN-7926-1
  CVE-2021-3563, CVE-2022-2447, CVE-2025-65073

Package Information:
  https://launchpad.net/ubuntu/+source/keystone/2:21.0.1-0ubuntu2.1
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