CVE-2024-29131: Apache Commons Configuration Overflow Flaw

CVE-2024-29131 Overview

CVE-2024-29131 is an out-of-bounds write vulnerability affecting Apache Commons Configuration, a widely-used Java library for reading configuration data from various sources. This vulnerability exists in versions 2.0 through 2.10.0 and allows attackers to potentially write data beyond allocated memory boundaries, which could lead to data corruption, application crashes, or potentially arbitrary code execution.

Critical Impact

This out-of-bounds write vulnerability in Apache Commons Configuration could allow network-based attackers to compromise application integrity and availability without requiring authentication or user interaction.

Affected Products

• Apache Commons Configuration versions 2.0 to 2.10.0
• Fedora 39 and 40 (bundled packages)
• NetApp ONTAP Tools 10 for VMware vSphere
• NetApp SnapCenter

Discovery Timeline

• 2024-03-21 - CVE-2024-29131 published to NVD
• 2025-05-01 - Last updated in NVD database

Technical Details for CVE-2024-29131

Vulnerability Analysis

The vulnerability is classified as CWE-787 (Out-of-bounds Write), a memory corruption flaw that occurs when software writes data outside the intended buffer boundaries. In the context of Apache Commons Configuration, this can occur during configuration data processing operations where insufficient bounds checking allows write operations to exceed allocated memory regions.

Apache Commons Configuration provides a unified API for reading configuration data from various sources including properties files, XML files, INI files, and more. The library's parsing and data handling routines contain the vulnerable code path that fails to properly validate array or buffer indices before performing write operations.

The network attack vector indicates the vulnerability can be triggered through processing maliciously crafted configuration data received over the network, making applications that parse untrusted configuration inputs particularly susceptible to exploitation.

Root Cause

The root cause stems from insufficient boundary validation when handling configuration data structures. When the library processes configuration entries, it fails to properly verify that write operations remain within the bounds of allocated memory regions. This allows an attacker to supply specially crafted input that causes the library to write data beyond the expected boundaries, potentially corrupting adjacent memory structures.

Attack Vector

An attacker can exploit this vulnerability by supplying maliciously crafted configuration data to an application using a vulnerable version of Apache Commons Configuration. The attack can be conducted remotely over the network without requiring authentication or user interaction.

The exploitation scenario typically involves:

1. Identifying an application that uses Apache Commons Configuration to parse external or user-supplied configuration data
2. Crafting configuration input designed to trigger the out-of-bounds write condition
3. Submitting the malicious configuration through any input vector the application accepts
4. The vulnerability triggers during configuration parsing, potentially allowing memory corruption that could lead to denial of service or code execution

For technical details on the vulnerability mechanism, refer to the Apache Mailing List Discussion and the Openwall OSS Security Update.

Detection Methods for CVE-2024-29131

Indicators of Compromise

• Unexpected application crashes or segmentation faults during configuration file parsing
• Anomalous memory access patterns in Java applications using Commons Configuration
• Application errors or exceptions related to array index or buffer operations during configuration loading
• Unusual configuration file submissions containing malformed or oversized entries

Detection Strategies

• Implement Software Composition Analysis (SCA) to identify applications using vulnerable versions of commons-configuration2 (versions 2.0 to 2.10.0)
• Monitor application logs for parsing errors or exceptions from the Apache Commons Configuration library
• Deploy runtime application self-protection (RASP) solutions to detect out-of-bounds memory access attempts
• Use Java security managers or sandboxing to detect and restrict anomalous memory operations

Monitoring Recommendations

• Enable verbose logging for configuration parsing operations to capture potential exploitation attempts
• Monitor for abnormal resource consumption during configuration loading that may indicate exploitation attempts
• Implement file integrity monitoring on configuration file directories to detect suspicious modifications
• Set up alerts for application restarts or crashes that correlate with configuration file access

How to Mitigate CVE-2024-29131

Immediate Actions Required

• Upgrade Apache Commons Configuration to version 2.10.1 or later immediately
• Audit all applications and dependencies for vulnerable Commons Configuration versions using dependency scanning tools
• Restrict network access to applications that parse untrusted configuration data until patches are applied
• Review and validate all configuration input sources, rejecting configuration data from untrusted origins

Patch Information

Apache has released version 2.10.1 of Commons Configuration which addresses this vulnerability. Users should upgrade their dependencies as follows:

For Maven projects, update the dependency in pom.xml:

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-configuration2</artifactId>
    <version>2.10.1</version>
</dependency>

For Gradle projects, update in build.gradle:

implementation 'org.apache.commons:commons-configuration2:2.10.1'

Additional vendor-specific patches are available:

• Fedora users should apply updates from the Fedora Package Announcement
• NetApp customers should refer to the NetApp Security Advisory for ONTAP Tools and SnapCenter updates

Workarounds

• Implement strict input validation on all configuration data before processing with Commons Configuration
• Deploy applications using vulnerable versions in isolated environments with restricted network access
• Use application-level sandboxing to limit the impact of potential memory corruption
• Consider temporarily disabling functionality that parses configuration from untrusted sources

# Example: Check for vulnerable Commons Configuration versions in Maven projects
mvn dependency:tree | grep -i "commons-configuration"

# Example: Force update to patched version in Maven
mvn versions:use-latest-releases -Dincludes=org.apache.commons:commons-configuration2