CVE-2018-1256 Issuer validation regression in Spring Cloud SSO Connector
Attackers can bypass authentication on unbound resource servers by using tokens from different SSO service plans in multi-plan PCF deployments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-1256?
CVE-2018-1256 is a high-severity authentication bypass vulnerability in Pivotal Spring Cloud SSO Connector, published on 7 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2018-1256?
2 open source packages ship an affected version, including io.pivotal.spring.cloud:spring-cloud-sso-connector. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
io.pivotal.spring.cloud:spring-cloud-sso-connector Maven | From 2.1.2.RELEASE | 2.1.3.RELEASE |
io.pivotal.spring.cloud:spring-cloud-sso-connector Maven | From 2.1.2.RELEASE | 2.1.3.RELEASE |
Products include Vmware Spring Cloud Sso Connector.
How do I fix CVE-2018-1256?
Upgrade io.pivotal.spring.cloud:spring-cloud-sso-connector to 2.1.3.RELEASE or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2018-1256 being exploited?
There is no known exploitation of CVE-2018-1256 in the wild and no public exploit code.
Sources
Also known as GHSA-q4q2-93pw-qwgf.