CVE-2018-1256
Issuer validation regression in Spring Cloud SSO Connector
Description
Spring Cloud SSO Connector, version 2.1.2, contains a regression which disables issuer validation in resource servers that are not bound to the SSO service. In PCF deployments with multiple SSO service plans, a remote attacker can authenticate to unbound resource servers which use this version of the SSO Connector with tokens generated from another service plan. ### Mitigation Users of affected versions should apply the following mitigation: * Releases that have fixed this issue include:</p><ul><li>Spring Cloud SSO Connector: 2.1.3</li></ul> * Alternatively, you can perform <u>one</u> of the following workarounds:</p><ul><li>Bind your resource server to the SSO service plan via a service instance binding</li><li>Set “sso.connector.cloud.available=true” within your Spring application properties</li></ul>
How to fix CVE-2018-1256
To remediate CVE-2018-1256, upgrade the affected package to a fixed version below.
- —upgrade to 2.1.3.RELEASE or later
Is CVE-2018-1256 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 2.1.2.RELEASE, < 2.1.3.RELEASE
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |