Spring Security Advisories

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Data Binding Expression Vulnerability in Spring Web Flow

MEDIUM | MAY 31, 2017 | CVE-2017-4971

Description

Applications that do not change the value of the MvcViewFactoryCreator useSpringBinding property which is disabled by default (i.e. set to “false”) can be vulnerable to malicious EL expressions in view states that process form submissions but do not have a sub-element to declare explicit data binding property mappings.

Affected Spring Products and Versions

Spring Web Flow:

  • 2.4.4 and earlier

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
2.4.5OSS
  • Note that generally it is a good practice and recommended to always use explicit data binding declarations in view states in order to prevent form submissions from setting fields on the target object that should not be set.
  • Spring Web Flow with JSF users are not impacted by this report.

Credit

The issue was identified by Stefano Ciccone of Gotham Digital Science

References

History

  • 2017-05-31: Initial vulnerability report published.

Reporting a vulnerability

To report a security vulnerability for a project within the Spring portfolio, see the Security Policy

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