An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The EC2 API doesnt 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.
Weakness
A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Keystone | Openstack | * | 15.0.1 (excluding) |
| Keystone | Openstack | 16.0.0 (including) | 16.0.0 (including) |
| Red Hat OpenStack Platform 13.0 (Queens) | RedHat | openstack-keystone-1:13.0.4-3.el7ost | * |
| Red Hat OpenStack Platform 13.0 (Queens) for RHEL 7.6 EUS | RedHat | openstack-keystone-1:13.0.4-3.el7ost | * |
| Red Hat OpenStack Platform 15.0 (Stein) | RedHat | openstack-keystone-1:15.0.1-0.20200512110437.95b2bbe.el8ost | * |
| Red Hat OpenStack Platform 16.0 (Train) | RedHat | openstack-keystone-1:16.0.1-0.20200511063421.40cbb7b.el8ost | * |
| Keystone | Ubuntu | bionic | * |
| Keystone | Ubuntu | eoan | * |
| Keystone | Ubuntu | esm-infra/bionic | * |
| Keystone | Ubuntu | esm-infra/xenial | * |
| Keystone | Ubuntu | trusty | * |
| Keystone | Ubuntu | upstream | * |
| Keystone | Ubuntu | xenial | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/102.html
- https://cwe.mitre.org/data/definitions/509.html
- https://cwe.mitre.org/data/definitions/555.html
- https://cwe.mitre.org/data/definitions/561.html
- https://cwe.mitre.org/data/definitions/60.html
- https://cwe.mitre.org/data/definitions/644.html
- https://cwe.mitre.org/data/definitions/645.html
- https://cwe.mitre.org/data/definitions/652.html
- https://cwe.mitre.org/data/definitions/701.html
- https://cwe.mitre.org/data/definitions/94.html
References
- http://www.openwall.com/lists/oss-security/2020/05/07/1
- https://bugs.launchpad.net/keystone/+bug/1872737
- https://security.openstack.org/ossa/OSSA-2020-003.html
- https://usn.ubuntu.com/4480-1/
- https://www.openwall.com/lists/oss-security/2020/05/06/4
- http://www.openwall.com/lists/oss-security/2020/05/07/1
- https://bugs.launchpad.net/keystone/+bug/1872737
- https://security.openstack.org/ossa/OSSA-2020-003.html
- https://usn.ubuntu.com/4480-1/
- https://www.openwall.com/lists/oss-security/2020/05/06/4