#VU118095 Incorrect authorization in OpenStack Keystone

Vulnerability identifier: #VU118095

Vulnerability risk: Critical

CVSSv4.0: 8.1 [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]

CVE-ID: N/A

CWE-ID: CWE-863

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenStack Keystone
Client/Desktop applications / Other client software

Vendor: Openstack

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenStack Keystone: - - 2015.1.4

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External links
https://security.openstack.org/ossa/OSSA-2025-002.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.