SB2025121606 - Ubuntu update for keystone
Published: December 16, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Incorrect authorization (CVE-ID: CVE-2025-65073)
CWE-ID: CWE-863 - Incorrect Authorization
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/U:Red
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)
CWE-ID: CWE-863 - Incorrect Authorization
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
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)
CWE-ID: CWE-613 - Insufficient Session Expiration
CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
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.