openstack-keystone: Incorrect Audit IDs in Keystone Fernet Tokens can result in revocation bypass
Published Jun 13, 2016
5.3
MEDIUMCVSS 4.0
EPSS 1.40%
Description
The Fernet Token Provider in OpenStack Identity (Keystone) 9.0.x before 9.0.1 (mitaka) allows remote authenticated users to prevent revocation of a chain of tokens and bypass intended access restrictions by rescoping a token.
Affected products
No data.
- 9.0.0.0
- 9.0.0.0
- 9.0.0.0
No data.
Red Hat Enterprise Linux OpenStack Platform 5 (Icehouse)
openstack-keystone
Not affected
Red Hat Enterprise Linux OpenStack Platform 6 (Juno)
openstack-keystone
Not affected
Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)
openstack-keystone
Not affected
Red Hat JBoss Fuse 6
openstack-keystone
Not affected
Red Hat OpenShift Enterprise 2
openstack-keystone
Not affected
Red Hat OpenStack Platform 8 (Liberty)
openstack-keystone
Not affected
Red Hat OpenStack Platform 9 (Mitaka)
openstack-keystone
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux OpenStack Platform 5 (Icehouse) | openstack-keystone | Not affected | n/a |
| Red Hat Enterprise Linux OpenStack Platform 6 (Juno) | openstack-keystone | Not affected | n/a |
| Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) | openstack-keystone | Not affected | n/a |
| Red Hat JBoss Fuse 6 | openstack-keystone | Not affected | n/a |
| Red Hat OpenShift Enterprise 2 | openstack-keystone | Not affected | n/a |
| Red Hat OpenStack Platform 8 (Liberty) | openstack-keystone | Not affected | n/a |
| Red Hat OpenStack Platform 9 (Mitaka) | openstack-keystone | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
AV:N/AC:L/Au:S/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.40% (0.01402) | 71.54th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.40% (0.01402) | 68.91th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.21% (0.00207) | 41.07th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.21% (0.00211) | 59.99th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.21% (0.00211) | 59.23th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.21% (0.00211) | 57.23th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.23% (0.01232) | 67.28th | v2 (v2022.01.01) |
| Dec 23, 2022 | 1.23% (0.01232) | 66.86th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.23% (0.01232) | 64.85th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.23% (0.01232) | 41.02th | v2 (v2022.01.01) |
References (14)
- http://www.openwall.com/lists/oss-security/2016/05/17/10 mailing-listx_refsource_MLISTMailing List
- http://www.openwall.com/lists/oss-security/2016/05/17/11 mailing-listx_refsource_MLISTMailing List
- http://www.securityfocus.com/bid/90728 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2016-4911 Vendor Advisory
- https://bugs.launchpad.net/keystone/+bug/1577558 x_refsource_CONFIRMVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1337079 Issue Tracking
- https://github.com/advisories/GHSA-f82m-w3p3-cgp3 Advisory
- https://github.com/openstack/keystone/commit/0d376025bae61bf5ee19d992c7f336b99ac69240
- https://github.com/openstack/keystone/commit/ee1dc941042d1f71699971c5c30566af1b348572
- https://github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2016-38.yaml
- https://nvd.nist.gov/vuln/detail/CVE-2016-4911
- https://review.openstack.org/#/c/311886 x_refsource_CONFIRMVendor Advisory
- https://security.openstack.org/ossa/OSSA-2016-008.html x_refsource_CONFIRMPatchVendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-4911
Change history (0)
No recorded changes yet.