SB2025121606 - Ubuntu update for keystone 

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Main Vulnerability Database SB2025121606

SB2025121606 - Ubuntu update for keystone

Published: December 16, 2025

Security Bulletin ID SB2025121606
Severity
Critical
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Critical 33% Medium 33% Low 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 secuirty vulnerabilities.


1) Incorrect authorization (CVE-ID: CVE-2025-65073)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to incorrect authorization checks within the ec2tokens and s3tokens API endpoints. A remote non-authenticated attacker can send a valid AWS Signature (e.g., from a presigned S3 URL) and obtain Keystone authorization (ec2tokens can yield a fully scoped token; s3tokens can reveal scope accepted by some services), resulting in unauthorized access and code execution.

Deployments where /v3/ec2tokens or /v3/s3tokens are reachable by unauthenticated clients (e.g., exposed on a public API) are affected.


2) Incorrect authorization (CVE-ID: CVE-2021-3563)

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists due to only the first 72 characters of an application secret are verified. A remote attacker can gain unauthorized access to bypass security restrictions.


3) Insufficient session expiration (CVE-ID: CVE-2022-2447)

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to insufficient session expiration issue. A remote administrator can secretly maintain access for longer than expected.


Remediation

Install update from vendor's website.

References