Security readout for executives and security teams
Plain-English summary
This flaw can let a remote user access a Spring Cloud SSO-protected resource server with a token issued for a different SSO service plan. The risk is concentrated in PCF deployments using Spring Cloud SSO Connector 2.1.2, multiple SSO service plans, and resource servers not bound to the SSO service.
Executive priority
Prioritize review if PCF hosts sensitive internal or customer-facing services using Spring Cloud SSO. The issue affects authentication boundaries, but urgency depends on the presence of version 2.1.2, unbound resource servers, and multiple SSO service plans.
Technical view
Spring Cloud SSO Connector 2.1.2 has a regression that disables issuer validation for resource servers not bound to the SSO service. In affected PCF environments, tokens from another SSO service plan may be accepted by an unbound resource server, creating an authentication boundary failure.
Likely exposure
Exposure appears limited to Pivotal Cloud Foundry deployments using Spring Cloud SSO Connector 2.1.2 with multiple SSO service plans and unbound resource servers. Organizations not using this connector version or deployment pattern are less likely to be affected based on the provided sources.
Exploitation context
The CVE describes remote authentication using tokens from another service plan. The source bundle does not cite public exploitation, and the CVE is not listed as KEV. Treat exploit status as unconfirmed, not actively exploited.
Researcher notes
Evidence is limited to the CVE description and Pivotal advisory reference. No CVSS, CWE, patch version, or exploitation evidence is included in the supplied bundle. Focus validation on issuer checking behavior, binding state, and SSO plan separation.
Mitigation direction
- Inventory applications using Spring Cloud SSO Connector 2.1.2.
- Review Pivotal advisory for fixed versions or vendor mitigation guidance.
- Bind resource servers to the intended SSO service where applicable.
- Prioritize affected PCF environments with multiple SSO service plans.
- Retire or replace vulnerable connector usage once vendor guidance is confirmed.
Validation and detection
- Confirm whether any PCF applications use Spring Cloud SSO Connector 2.1.2.
- Identify resource servers not bound to the SSO service.
- Check whether multiple SSO service plans exist in the deployment.
- Review authentication logs for cross-plan token acceptance indicators.
- Document affected apps, owners, and remediation status.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-1256 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://pivotal.io/security/cve-2018-1256CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.