Common Weakness Enumeration

CWE-639

Allowed

Authorization Bypass Through User-Controlled Key

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

2771 vulnerabilities reference this CWE, most recent first.

CVE-2012-5571 (GCVE-0-2012-5571)

Vulnerability from cvelistv5 – Published: 2012-12-18 01:00 – Updated: 2026-10-30 18:03
VLAI
Title
Openstack keystone: openstack keystone: authorization bypass via improper ec2 token handling
Summary
A flaw was found in OpenStack Keystone. This vulnerability allows remote authenticated users to bypass intended authorization restrictions. This occurs because OpenStack Keystone does not properly handle EC2 (Elastic Compute Cloud) tokens when a user's role has been removed from a tenant. An attacker can leverage a token associated with a removed user role to gain unauthorized access.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
redhat CNA
References
Impacted products
Vendor Product Version
Red Hat OpenStack Essex for RHEL 6 Unaffected: 0:2012.1.3-3.el6 , < * (rpm)
    cpe:/a:redhat:openstack:1::el6
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Red Hat OpenStack Folsom for RHEL 6 Unaffected: 0:2012.2.1-1.el6ost , < * (rpm)
    cpe:/a:redhat:openstack:2::el6
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Red Hat Red Hat OpenStack Platform 13 (Queens)     cpe:/a:redhat:openstack:13
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Red Hat Red Hat OpenStack Platform 16.2     cpe:/a:redhat:openstack:16.2
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Red Hat Red Hat OpenStack Platform 17.1     cpe:/a:redhat:openstack:17.1
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Red Hat Red Hat OpenStack Platform 18.0     cpe:/a:redhat:openstack:18.0
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Date Public
2012-12-18 01:00
Show details on NVD website
To clipboard 

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Mitigation
Architecture and Design

For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.

Mitigation
Architecture and Design Implementation

Make sure that the key that is used in the lookup of a specific user's record is not controllable externally by the user or that any tampering can be detected.

Mitigation
Architecture and Design

Use encryption in order to make it more difficult to guess other legitimate values of the key or associate a digital signature with the key so that the server can verify that there has been no tampering.

No CAPEC attack patterns related to this CWE.

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