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CVE-2023-25194

Status Candidate

Overview

A possible security vulnerability has been identified in Apache Kafka Connect API. 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 Connect 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 Connect 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.

Related Files

Apache Druid JNDI Injection Remote Code Execution
Posted Jun 27, 2023
Authored by RedWay Security, Jari Jaaskela | Site metasploit.com

This Metasploit module is designed to exploit the JNDI injection vulnerability in Druid. The vulnerability specifically affects the indexer/v1/sampler interface of Druid, enabling an attacker to execute arbitrary commands on the targeted server. The vulnerability is found in Apache Kafka clients versions ranging from 2.3.0 to 3.3.2. If an attacker can manipulate the sasl.jaas.config property of any of the connector's Kafka clients to com.sun.security.auth.module.JndiLoginModule, it allows the server to establish a connection with the attacker's LDAP server and deserialize the LDAP response. This provides the attacker with the capability to execute java deserialization gadget chains on the Kafka connect server, potentially leading to unrestricted deserialization of untrusted data or even remote code execution (RCE) if there are relevant gadgets in the classpath. To facilitate the exploitation process, this module will initiate an LDAP server that the target server needs to connect to in order to carry out the attack.

tags | exploit, java, remote, arbitrary, code execution
advisories | CVE-2023-25194
SHA-256 | f66b350948de8d0c6e468d03fb8436dd9af78149309b8e72facbdb3d5300a0ea
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