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CSRF attack via CORS preflight requests with Spring MVC or Spring WebFlux

Moderate severity GitHub Reviewed Published Jan 21, 2020 to the GitHub Advisory Database • Updated Mar 25, 2024

Package

maven org.springframework:spring-webflux (Maven)

Affected versions

>= 5.2.0, < 5.2.3

Patched versions

5.2.3
maven org.springframework:spring-webmvc (Maven)
>= 5.2.0, < 5.2.3
5.2.3

Description

Spring Framework, versions 5.2.x prior to 5.2.3 are vulnerable to CSRF attacks through CORS preflight requests that target Spring MVC (spring-webmvc module) or Spring WebFlux (spring-webflux module) endpoints. Only non-authenticated endpoints are vulnerable because preflight requests should not include credentials and therefore requests should fail authentication. However a notable exception to this are Chrome based browsers when using client certificates for authentication since Chrome sends TLS client certificates in CORS preflight requests in violation of spec requirements. No HTTP body can be sent or received as a result of this attack.

References

Published by the National Vulnerability Database Jan 17, 2020
Reviewed Jan 21, 2020
Published to the GitHub Advisory Database Jan 21, 2020
Last updated Mar 25, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS score

0.190%
(57th percentile)

Weaknesses

CVE ID

CVE-2020-5397

GHSA ID

GHSA-7pm4-g2qj-j85x

Source code

Credits

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