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A possible security vulnerability has been identified in Apache Kafka Connect. This requires access to a Kafka Connect worker, and the ability to create/modify connectors on it with an arbitrary Kafka client SASL JAAS config and a SASL-based security protocol, which has been possible on Kafka Connect clusters since Apache Kafka 2.3.0. When configuring the connector via the Kafka Connect REST API, an authenticated operator can set the sasl.jaas.config property for any of the connector's Kafka clients to "com.sun.security.auth.module.JndiLoginModule", which can be done via the producer.override.sasl.jaas.config, consumer.override.sasl.jaas.config, or admin.override.sasl.jaas.config properties. This will allow the server to connect to the attacker's LDAP server and deserialize the LDAP response, which the attacker can use to execute java deserialization gadget chains on the Kafka connect server. Attacker can cause unrestricted deserialization of untrusted data (or) RCE vulnerability when there are gadgets in the classpath. Since Apache Kafka 3.0.0, users are allowed to specify these properties in connector configurations for Kafka Connect clusters running with out-of-the-box configurations. Before Apache Kafka 3.0.0, users may not specify these properties unless the Kafka Connect cluster has been reconfigured with a connector client override policy that permits them. Since Apache Kafka 3.4.0, we have added a system property ("-Dorg.apache.kafka.disallowed.login.modules") to disable the problematic login modules usage in SASL JAAS configuration. Also by default "com.sun.security.auth.module.JndiLoginModule" is disabled in Apache Kafka 3.4.0. We advise the Kafka Connect users to validate connector configurations and only allow trusted JNDI configurations. Also examine connector dependencies for vulnerable versions and either upgrade their connectors, upgrading that specific dependency, or removing the connectors as options for remediation. Finally, in addition to leveraging the "org.apache.kafka.disallowed.login.modules" system property, Kafka Connect users can also implement their own connector client config override policy, which can be used to control which Kafka client properties can be overridden directly in a connector config and which cannot.
Some components in Apache Kafka use Arrays.equals to validate a password or key, which is vulnerable to timing attacks that make brute force attacks for such credentials more likely to be successful. Users should upgrade to 2.8.1 or higher, or 3.0.0 or higher where this vulnerability has been fixed. The affected versions include Apache Kafka 2.0.0, 2.0.1, 2.1.0, 2.1.1, 2.2.0, 2.2.1, 2.2.2, 2.3.0, 2.3.1, 2.4.0, 2.4.1, 2.5.0, 2.5.1, 2.6.0, 2.6.1, 2.6.2, 2.7.0, 2.7.1, and 2.8.0.
Vulnerable Library - kafka-clients-2.4.0.jar
Library home page: https://kafka.apache.org
Path to dependency file: /server/plugins/kafka-event-sink/pom.xml
Path to vulnerable library: /home/wss-scanner/.m2/repository/org/apache/kafka/kafka-clients/2.4.0/kafka-clients-2.4.0.jar
Found in HEAD commit: 97d18a56dfc9d482e0ac2ae24230edd85457b90b
Vulnerabilities
Details
CVE-2023-25194
Vulnerable Library - kafka-clients-2.4.0.jar
Library home page: https://kafka.apache.org
Path to dependency file: /server/plugins/kafka-event-sink/pom.xml
Path to vulnerable library: /home/wss-scanner/.m2/repository/org/apache/kafka/kafka-clients/2.4.0/kafka-clients-2.4.0.jar
Dependency Hierarchy:
Found in HEAD commit: 97d18a56dfc9d482e0ac2ae24230edd85457b90b
Found in base branch: master
Vulnerability Details
A possible security vulnerability has been identified in Apache Kafka Connect. This requires access to a Kafka Connect worker, and the ability to create/modify connectors on it with an arbitrary Kafka client SASL JAAS config and a SASL-based security protocol, which has been possible on Kafka Connect clusters since Apache Kafka 2.3.0. When configuring the connector via the Kafka Connect REST API, an authenticated operator can set the
sasl.jaas.config
property for any of the connector's Kafka clients to "com.sun.security.auth.module.JndiLoginModule", which can be done via theproducer.override.sasl.jaas.config
,consumer.override.sasl.jaas.config
, oradmin.override.sasl.jaas.config
properties. This will allow the server to connect to the attacker's LDAP server and deserialize the LDAP response, which the attacker can use to execute java deserialization gadget chains on the Kafka connect server. Attacker can cause unrestricted deserialization of untrusted data (or) RCE vulnerability when there are gadgets in the classpath. Since Apache Kafka 3.0.0, users are allowed to specify these properties in connector configurations for Kafka Connect clusters running with out-of-the-box configurations. Before Apache Kafka 3.0.0, users may not specify these properties unless the Kafka Connect cluster has been reconfigured with a connector client override policy that permits them. Since Apache Kafka 3.4.0, we have added a system property ("-Dorg.apache.kafka.disallowed.login.modules") to disable the problematic login modules usage in SASL JAAS configuration. Also by default "com.sun.security.auth.module.JndiLoginModule" is disabled in Apache Kafka 3.4.0. We advise the Kafka Connect users to validate connector configurations and only allow trusted JNDI configurations. Also examine connector dependencies for vulnerable versions and either upgrade their connectors, upgrading that specific dependency, or removing the connectors as options for remediation. Finally, in addition to leveraging the "org.apache.kafka.disallowed.login.modules" system property, Kafka Connect users can also implement their own connector client config override policy, which can be used to control which Kafka client properties can be overridden directly in a connector config and which cannot.Publish Date: 2023-02-07
URL: CVE-2023-25194
CVSS 3 Score Details (6.6)
Base Score Metrics:
Suggested Fix
Type: Upgrade version
Origin: https://kafka.apache.org/cve-list
Release Date: 2023-02-07
Fix Resolution: 3.4.0
⛑️ Automatic Remediation is available for this issue
CVE-2021-38153
Vulnerable Library - kafka-clients-2.4.0.jar
Library home page: https://kafka.apache.org
Path to dependency file: /server/plugins/kafka-event-sink/pom.xml
Path to vulnerable library: /home/wss-scanner/.m2/repository/org/apache/kafka/kafka-clients/2.4.0/kafka-clients-2.4.0.jar
Dependency Hierarchy:
Found in HEAD commit: 97d18a56dfc9d482e0ac2ae24230edd85457b90b
Found in base branch: master
Vulnerability Details
Some components in Apache Kafka use
Arrays.equals
to validate a password or key, which is vulnerable to timing attacks that make brute force attacks for such credentials more likely to be successful. Users should upgrade to 2.8.1 or higher, or 3.0.0 or higher where this vulnerability has been fixed. The affected versions include Apache Kafka 2.0.0, 2.0.1, 2.1.0, 2.1.1, 2.2.0, 2.2.1, 2.2.2, 2.3.0, 2.3.1, 2.4.0, 2.4.1, 2.5.0, 2.5.1, 2.6.0, 2.6.1, 2.6.2, 2.7.0, 2.7.1, and 2.8.0.Publish Date: 2021-09-22
URL: CVE-2021-38153
CVSS 3 Score Details (5.9)
Base Score Metrics:
Suggested Fix
Type: Upgrade version
Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38153
Release Date: 2021-09-22
Fix Resolution: 2.6.3
⛑️ Automatic Remediation is available for this issue
⛑️ Automatic Remediation is available for this issue.
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