Description
An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The EC2 API doesn't have a signature TTL check for AWS Signature V4. An attacker can sniff the Authorization header, and then use it to reissue an OpenStack token an unlimited number of times.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | keystone | 2:17.0.0~rc2-1 | — |
| Debian 13 | keystone | 2:17.0.0~rc2-1 | — |
| Debian 12 | keystone | 2:17.0.0~rc2-1 | — |
| Debian 10 | keystone | 2:14.2.0-0+deb10u1 | DSA-4679-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | keystone | 2:13.0.4-0ubuntu1 | USN-4480-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | keystone | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenStack 16 | python3-keystone +1 | 1:16.0.1-0.20200511063421.40cbb7b.el8ost | RHSA-2020:3105 |
| Red Hat OpenStack 15 | python3-keystone +1 | 1:15.0.1-0.20200512110437.95b2bbe.el8ost | RHSA-2020:3102 |
| Red Hat OpenStack 13 | python-keystone +1 | 1:13.0.4-3.el7ost | RHSA-2020:2732 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | keystone | >= 16.0.0.0rc1, < 16.0.0 | 16.0.0 | GHSA-rqw2-hhrf-7936 |
| PyPI | keystone | < 15.0.1 | 15.0.1 | GHSA-rqw2-hhrf-7936 |
Advisories 5
- RHSA-2020:3102 Red Hat Security Advisory: openstack-keystone security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2020:3105 Red Hat Security Advisory: openstack-keystone security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2020:2732 Red Hat Security Advisory: openstack-keystone security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- USN-4480-1 keystone vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4679-1 keystone - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://security.openstack.org/ossa/OSSA-2020-003.html
- https://bugs.launchpad.net/keystone/+bug/1872737
- https://www.openwall.com/lists/oss-security/2020/05/06/4
- [oss-security] 20200507 Re: [OSSA-2020-003] Keystone: Keystone does not check signature TTL of the EC2 credential auth method (CVE PENDING) mailing-list
- USN-4480-1 vendor-advisory