Spring Security Advisories

CVE-2023-34053: Spring Framework server Web Observations DoS Vulnerability

MEDIUM | NOVEMBER 27, 2023 | CVE-2023-34053

In Spring Framework versions 6.0.0 - 6.0.13, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service (DoS) condition.

Specifically, an application is vulnerable when all of the following are true:

  • the application uses Spring MVC or Spring WebFlux
  • io.micrometer:micrometer-core is on the classpath
  • an ObservationRegistry is configured in the application to record observations

CVE-2023-34050 Spring AMQP Deserialization Vulnerability

MEDIUM | OCTOBER 18, 2023 | CVE-2023-34050

In 2016, allowed list patterns for deserializable class names were added to Spring AMQP, allowing users to lock down deserialization of data in messages from untrusted sources; however by default, when no allowed list was provided, all classes could…

CVE-2023-34040: Java Deserialization vulnerability in Spring-Kafka When Improperly Configured

MEDIUM | AUGUST 23, 2023 | CVE-2023-34040

In Spring for Apache Kafka 3.0.9 and earlier and versions 2.9.10 and earlier, a possible deserialization attack vector existed, but only if unusual configuration was applied. An attacker would have to construct a malicious serialized object in one of the deserialization exception record headers.

Specifically, an application is vulnerable when all of the following are true:

  • The user does not configure an ErrorHandlingDeserializer for the key and/or value of the record
  • The user explicitly sets container properties checkDeserExWhenKeyNull and/or checkDeserExWhenValueNull container properties to true.
  • The user allows untrusted sources to publish to a Kafka topic

By default, these properties are false, and the container only attempts to deserialize the headers if an ErrorHandlingDeserializer is configured. The ErrorHandlingDeserializer prevents the vulnerability by removing any such malicious headers before…

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