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GHSA-xf96-w227-r7c4

HighCVSS 7.5 / 10
Published May 26, 2023·Last modified Feb 21, 2024
Affected Components(0)

No affected components available

Description

In Spring Boot versions 3.0.0 - 3.0.6, 2.7.0 - 2.7.11, 2.6.0 - 2.6.14, 2.5.0 - 2.5.14 and older unsupported versions, there is potential for a denial-of-service (DoS) attack if Spring MVC is used together with a reverse proxy cache.

Specifically, an application is vulnerable if all of the conditions are true:

  • The application has Spring MVC auto-configuration enabled. This is the case by default if Spring MVC is on the classpath.
  • The application makes use of Spring Boot's welcome page support, either static or templated.
  • Your application is deployed behind a proxy which caches 404 responses.

Your application is NOT vulnerable if any of the following are true:

  • Spring MVC auto-configuration is disabled. This is true if WebMvcAutoConfiguration is explicitly excluded, if Spring MVC is not on the classpath, or if spring.main.web-application-type is set to a value other than SERVLET.
  • The application does not use Spring Boot's welcome page support.
  • You do not have a proxy which caches 404 responses.

Affected Spring Products and Versions

Spring Boot

3.0.0 to 3.0.6 2.7.0 to 2.7.11 2.6.0 to 2.6.14 2.5.0 to 2.5.14

Older, unsupported versions are also affected Mitigation

Users of affected versions should apply the following mitigations:

  • 3.0.x users should upgrade to 3.0.7+
  • 2.7.x users should upgrade to 2.7.12+
  • 2.6.x users should upgrade to 2.6.15+
  • 2.5.x users should upgrade to 2.5.15+

Users of older, unsupported versions should upgrade to 3.0.7+ or 2.7.12+.

Workarounds: configure the reverse proxy not to cache 404 responses and/or not to cache responses to requests to the root (/) of the application.

Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.90%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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