An important security vulnerability has been discovered in Apache Jackrabbit, a popular open-source content repository used in enterprise content management systems and web applications.

This flaw could allow unauthenticated attackers to achieve arbitrary code execution (RCE) on servers running vulnerable versions, presenting a critical risk to system security and data confidentiality.

The vulnerability, tracked as JCR-5135, is classified as a “Deserialization of Untrusted Data” issue. It resides in how certain Apache Jackrabbit components handle Java Naming and Directory Interface (JNDI) lookups.

Specifically, if a deployment is configured to accept JNDI URIs for Java Content Repository (JCR) lookups from untrusted or public-facing sources, an attacker can exploit this pathway.

By submitting a specially crafted, malicious JNDI reference, an attacker can trick the application into processing it.

This action triggers the deserialization of untrusted data from an attacker-controlled source, which can result in the execution of arbitrary commands on the underlying server with the privileges of the application.

A successful exploit could allow an attacker to install malware, steal sensitive data, or take complete control of the affected system. Security researcher James John reported the issue.

Affected Versions

The vulnerability is widespread, affecting over two decades of releases for two of the project’s foundational components. All users running the following versions are considered at risk and should review their systems immediately.

Apache Jackrabbit Core (org.apache.jackrabbit:jackrabbit-core): Versions 1.0.0 through 2.22.1
Apache Jackrabbit JCR Commons (org.apache.jackrabbit:jackrabbit-jcr-commons): Versions 1.0.0 through 2.22.1

Mitigation And Recommendations

To address this significant security risk, the Apache Jackrabbit project team has released a patch. Administrators are strongly urged to upgrade all affected deployments to version 2.22.2 or later.

The primary security fix in the new version is the default disabling of JCR lookups through JNDI, which closes the attack vector for most users.

For those who require this specific functionality for their operations, it must now be enabled explicitly through a system property.

Developers advise that anyone re-enabling this feature must perform a careful security review of its use, ensuring that no unvalidated, user-supplied data can influence the JNDI URI being processed.

Applying the update is the most effective way to mitigate the threat.

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