CVE-2024-20922: Oracle GraalVM Auth Bypass Vulnerability

CVE-2024-20922 Overview

CVE-2024-20922 is a vulnerability in the Oracle Java SE and Oracle GraalVM Enterprise Edition products, specifically affecting the JavaFX component. This vulnerability allows an unauthenticated attacker with local access to the infrastructure where these products execute to potentially compromise the integrity of data processed by affected Java deployments.

Critical Impact

Successful exploitation can result in unauthorized update, insert, or delete access to some Oracle Java SE and Oracle GraalVM Enterprise Edition accessible data, affecting sandboxed Java Web Start applications and Java applets that load untrusted code from the internet.

Affected Products

• Oracle Java SE: 8u391 (JDK and JRE)
• Oracle GraalVM Enterprise Edition: 20.3.12 and 21.3.8
• NetApp Cloud Insights Acquisition Unit
• NetApp Cloud Insights Storage Workload Security Agent
• NetApp OnCommand Insight

Discovery Timeline

• 2024-01-16 - CVE-2024-20922 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-20922

Vulnerability Analysis

This vulnerability resides in the JavaFX component of Oracle Java SE and Oracle GraalVM Enterprise Edition. The flaw specifically impacts client-side Java deployments that run sandboxed Java Web Start applications or sandboxed Java applets designed to execute untrusted code from external sources such as the internet. These deployments rely on the Java sandbox security model for protection.

The vulnerability requires local access to the infrastructure where the affected Java products execute, making it necessary for an attacker to have logon capabilities to the target system. Additionally, successful exploitation requires human interaction from a person other than the attacker, adding complexity to the attack scenario. Server-side Java deployments that only load and run trusted code (such as code installed by an administrator) are not affected by this vulnerability.

Root Cause

The root cause of CVE-2024-20922 stems from a security weakness in the JavaFX component's handling of certain operations within the Java sandbox environment. While Oracle has not disclosed specific technical details about the underlying flaw, the vulnerability classification indicates an integrity-related issue that could allow unauthorized data modification within the scope of affected Java applications.

Attack Vector

Exploitation of this vulnerability requires a local attack vector, meaning the attacker must have direct access to the system running the vulnerable Java software. The attack complexity is high, requiring specific conditions to be met for successful exploitation. The attacker must be unauthenticated but needs logon access to the target infrastructure.

The attack scenario typically involves:

1. The attacker gains local access to a system running a vulnerable Oracle Java SE or GraalVM Enterprise Edition version
2. The attacker crafts or deploys malicious code designed to exploit the JavaFX component weakness
3. A legitimate user must interact with the system in a way that triggers the vulnerability
4. Upon successful exploitation, the attacker can modify accessible data within the scope of the Java application

This vulnerability primarily impacts environments where users regularly execute Java Web Start applications or Java applets that load untrusted code from the internet.

Detection Methods for CVE-2024-20922

Indicators of Compromise

• Unexpected data modifications in Java applications that process sensitive information
• Anomalous behavior in JavaFX-based applications, particularly those running sandboxed code
• Suspicious local user activity involving Java Web Start applications or Java applets

Detection Strategies

• Monitor for execution of Java Web Start applications (javaws) and Java applets from untrusted sources
• Implement application whitelisting to control which Java applications can run in the environment
• Deploy endpoint detection solutions capable of monitoring Java process behavior and sandbox escape attempts

Monitoring Recommendations

• Enable verbose Java logging to capture detailed execution information for forensic analysis
• Monitor file system changes associated with Java application data directories
• Review authentication logs for unusual local logon activity preceding Java application execution
• Implement runtime application self-protection (RASP) for critical Java deployments

How to Mitigate CVE-2024-20922

Immediate Actions Required

• Update Oracle Java SE 8 to a version newer than 8u391
• Upgrade Oracle GraalVM Enterprise Edition from versions 20.3.12 and 21.3.8 to the latest patched releases
• Review and restrict the use of Java Web Start applications and Java applets that load untrusted code
• Apply the Oracle January 2024 Critical Patch Update (CPU) to all affected systems

Patch Information

Oracle has addressed this vulnerability in the January 2024 Critical Patch Update (CPU). Administrators should review the Oracle Security Alert CPU January 2024 for detailed patching instructions and download links.

For NetApp products, consult the NetApp Security Advisory NTAP-20240201-0002 for specific guidance on updating Cloud Insights Acquisition Unit, Cloud Insights Storage Workload Security Agent, and OnCommand Insight.

Workarounds

• Disable Java Web Start and Java applet functionality if not required for business operations
• Configure Java security settings to prevent execution of untrusted code by setting the security level to "Very High" in the Java Control Panel
• Implement network segmentation to limit local access to systems running critical Java applications
• Use application control policies to restrict which Java applications can execute in the environment

# Example: Disable Java Web Start associations (Windows)
# Remove JNLP file associations to prevent automatic execution
assoc .jnlp=

# Example: Verify installed Java version
java -version

# Example: Check for vulnerable GraalVM version
$GRAALVM_HOME/bin/java -version