Severity

Medium

Vendor

Spring by VMware

Description

Spring Security versions 5.2.x prior to 5.2.4 and 5.3.x prior to 5.3.2 contain a signature wrapping vulnerability during SAML response validation. When using the spring-security-saml2-service-provider component, a malicious user can carefully modify an otherwise valid SAML response and append an arbitrary assertion that Spring Security will accept as valid.

Affected VMware Products and Versions

Severity is medium unless otherwise noted.

• Spring Security
  • 5.2.x prior to 5.2.4
  • 5.3.x prior to 5.3.2

Mitigation

• Spring Security
  • 5.2.4
  • 5.3.2

Credit

This issue was identified and responsibly reported by Sam Tinklenberg.

References

• https://github.com/spring-projects/spring-security/tree/5.2.3.RELEASE/samples/boot/saml2login
• https://docs.spring.io/spring-security/site/docs/5.2.3.RELEASE/reference/html5/#saml2

History

2020-05-07: Initial vulnerability report published.