CVE-2020-5397

Public Exploit
CSRF Attack via CORS Preflight Requests with Spring MVC or Spring WebFlux

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.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.89% Top 30%
Vendor Advisory pivotal.io
Affected: Spring Spring Framework
Published at:
Updated at:

References

Frequently Asked Questions

What is the severity of CVE-2020-5397?
CVE-2020-5397 has been scored as a medium severity vulnerability.
How to fix CVE-2020-5397?
To fix CVE-2020-5397, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-5397 being actively exploited in the wild?
It is possible that CVE-2020-5397 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-5397?
CVE-2020-5397 affects Spring Spring Framework.
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