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GHSA-crqf-q9fp-hwjw: Spring-Kafka has Java Deserialization vulnerability When Improperly Configured

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 processing the record.

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  1. GitHub Advisory Database
  2. GitHub Reviewed
  3. CVE-2023-34040

Spring-Kafka has Java Deserialization vulnerability When Improperly Configured

Moderate severity GitHub Reviewed Published Aug 24, 2023 to the GitHub Advisory Database • Updated Aug 24, 2023

Package

maven org.springframework.kafka:spring-kafka (Maven)

Affected versions

>= 2.8.0, < 2.9.11

>= 3.0.0, < 3.0.10

Patched versions

2.9.11

3.0.10

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 processing the record.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2023-34040
  • https://spring.io/security/cve-2023-34040
  • spring-projects/spring-kafka@25ac793
  • spring-projects/spring-kafka@eb77967

Published to the GitHub Advisory Database

Aug 24, 2023

Last updated

Aug 24, 2023

Related news

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

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 processing the record.