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Spring-AMQP Remote Denial of Service - Deserialization of a Maliciously Constructed java.util.Dictionary Object

MEDIUM | OCTOBER 26, 2021 | CVE-2021-22097

Description

The Spring AMQP Message object, in its toString() method, will deserialize a body for a message with content type application/x-java-serialized-object. Classes in the java.lang and java.util packages are trusted.

It is possible to construct a malicious java.util.Dictionary object that can cause 100% CPU usage in the application if the toString() method is called.

This requires the attacker to have privileges to directly publish messages with such a body to the RabbitMQ server.

Affected Spring Products and Versions

Spring AMQP:

  • 2.3.0 - 2.3.10
  • 2.2.0.RELEASE - 2.2.18.RELEASE

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
2.3.11OSS
2.2.19.RELEASEOSS

Do not allow untrustworthy actors to publish arbitrary data to RabbitMQ. No other steps are necessary.

Credit

This issue was identified and responsibly reported by r00t4dm Cloud-Penetrating Arrow Lab of Meituan Corp Information Security Department.

References

History

  • 2021-10-26: 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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