CVE-2022-24818: GeoTools JNDI RCE Vulnerability

CVE-2022-24818 Overview

CVE-2022-24818 is an Insecure Deserialization and Code Injection vulnerability affecting GeoTools, an open source Java library that provides tools for geospatial data. The GeoTools library contains multiple data sources that perform unchecked JNDI (Java Naming and Directory Interface) lookups. When exploited, these unchecked lookups can be leveraged to trigger class deserialization, ultimately resulting in arbitrary code execution on vulnerable systems.

Similar to the well-known Log4Shell (Log4J) vulnerability, this flaw can be triggered when JNDI names are user-provided. However, exploitation requires admin-level authentication, which reduces the immediate attack surface. The vulnerability has been addressed in GeoTools versions 26.4, 25.6, and 24.6 through the implementation of restricted JNDI lookups.

Critical Impact

Successful exploitation allows authenticated administrators to execute arbitrary code through malicious JNDI lookup strings, potentially leading to complete system compromise.

Affected Products

• GeoTools versions prior to 26.4
• GeoTools versions prior to 25.6
• GeoTools versions prior to 24.6

Discovery Timeline

• 2022-04-13 - CVE-2022-24818 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-24818

Vulnerability Analysis

This vulnerability stems from improper input validation (CWE-20) and expression language injection (CWE-917) in GeoTools' JNDI lookup functionality. The library's data sources perform JNDI lookups without adequate validation of the lookup names, creating an injection point for malicious payloads.

When an attacker with administrative access provides a crafted JNDI lookup string, the vulnerable code path executes the lookup without proper sanitization. This allows the attacker to direct the lookup to an attacker-controlled server, which can then return a malicious serialized object. Upon deserialization, this object can execute arbitrary code within the context of the GeoTools application.

The attack requires network access and administrative privileges, making it a post-authentication vulnerability. However, the potential for complete system compromise through arbitrary code execution makes this a significant security concern for organizations using affected GeoTools versions.

Root Cause

The root cause lies in the unsafe handling of JNDI lookup operations within GeoTools. The library's original implementation allowed direct JNDI lookups with user-supplied names through methods like GeoTools.getInitialContext().lookup(name). Without validation, these lookup names could include malicious schemas (such as ldap://, rmi://, or dns://) pointing to attacker-controlled infrastructure. The absence of a name validation mechanism permitted attackers to bypass intended security boundaries and inject arbitrary JNDI references that trigger remote class loading and deserialization.

Attack Vector

The attack exploits the network-accessible JNDI lookup functionality. An authenticated administrator can supply a malicious JNDI name containing a reference to an external server. The vulnerable code performs the lookup, connecting to the attacker's server, which responds with a malicious serialized Java object. When GeoTools deserializes this object, the attacker's payload executes with the privileges of the Java application.

The attack flow involves:

1. Attacker obtains administrative access to the GeoTools application
2. Attacker crafts a malicious JNDI name pointing to their controlled LDAP/RMI server
3. The application performs an unchecked JNDI lookup
4. The attacker's server returns a malicious serialized object
5. Deserialization triggers arbitrary code execution

The security patch introduces a validation mechanism through GeoTools.jndiLookup(name) with DEFAULT_JNDI_VALIDATOR that restricts lookups to safe schemas:

GeoTools
^^^^^^^^

In GeoTools 25.7 ``GeoTools.getInitialContext().look(name)`` and related methods have been deprecated, with ``GeoTools.jndiLookup(name)``. We have also taken an opportunity to remove ``GeoTools.fixName( context, name )`` 

The use of ``GeoTools.jndiLookup(name)`` is subject to validation with the default ``GeoTools.DEFAULT_JNDI_VALIDATOR`` validator used limit name lookup.

BEFORE

.. code-block:: java

   context = GeoTools.getInitialContext();
   String fixedName = GeoTools.fixName( context, name );
   return (DataSource) context.lookup(fixedName);

AFTER

.. code-block:: java

   return (DataSource) GeoTools.jndiLookup(name);

Source: GitHub Commit

Detection Methods for CVE-2022-24818

Indicators of Compromise

• Unusual outbound connections from GeoTools applications to external LDAP, RMI, or DNS servers
• JNDI lookup strings containing suspicious schemas such as ldap://, rmi://, or dns:// in application logs
• Unexpected Java class loading or deserialization activity in application runtime
• Administrative access logs showing unusual JNDI configuration changes

Detection Strategies

• Monitor application logs for JNDI lookup patterns containing external URLs or IP addresses
• Implement network-level detection for outbound connections to non-standard LDAP/RMI ports
• Deploy runtime application security monitoring to detect suspicious deserialization behavior
• Review administrative action audit logs for unauthorized JNDI configuration modifications

Monitoring Recommendations

• Enable verbose logging for GeoTools JNDI operations to capture all lookup attempts
• Configure network intrusion detection systems (IDS) to alert on JNDI-related traffic patterns
• Implement security information and event management (SIEM) rules correlating admin logins with JNDI activity
• Establish baseline behavior for legitimate JNDI lookups to identify anomalous patterns

How to Mitigate CVE-2022-24818

Immediate Actions Required

• Upgrade GeoTools to version 26.4, 25.6, or 24.6 or later immediately
• Audit administrative access and ensure only trusted personnel have admin-level privileges
• Review application configurations for any remotely provided JNDI strings
• Implement network segmentation to restrict outbound connections from GeoTools applications

Patch Information

The vulnerability has been addressed in GeoTools versions 26.4, 25.6, and 24.6. The fix introduces the GeoTools.jndiLookup(name) method with built-in validation through DEFAULT_JNDI_VALIDATOR, which ensures only no-schema and java schema lookups are permitted by default. Organizations should upgrade to the patched versions as the primary remediation strategy. The security fix is detailed in the GitHub Security Advisory and the commit changes.

Workarounds

• If upgrading is not immediately possible, ensure downstream applications do not allow usage of remotely provided JNDI strings
• Implement strict input validation for any JNDI name parameters at the application level
• Restrict network egress to prevent connections to external LDAP/RMI servers
• Consider implementing a custom JNDI name validator using GeoTools.setJNDINameValidator(Predicate<String>) to limit allowed lookups

# Network-level mitigation: Block outbound LDAP/RMI connections
# Example iptables rules to restrict outbound JNDI-related traffic
iptables -A OUTPUT -p tcp --dport 389 -j DROP   # LDAP
iptables -A OUTPUT -p tcp --dport 636 -j DROP   # LDAPS
iptables -A OUTPUT -p tcp --dport 1099 -j DROP  # RMI