CVE-2024-21211: NetApp Bootstrap OS Auth Bypass Flaw

CVE-2024-21211 Overview

CVE-2024-21211 is a vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition products, specifically affecting the Compiler component. This vulnerability allows an unauthenticated attacker with network access via multiple protocols to compromise the integrity of affected systems. While difficult to exploit, successful attacks can result in unauthorized update, insert, or delete access to some accessible data within these Oracle products.

Critical Impact

This vulnerability can be exploited through APIs in the Compiler component, including web services that supply data to these APIs. It also affects Java deployments running sandboxed Java Web Start applications or sandboxed Java applets that load and run untrusted code from the internet and rely on the Java sandbox for security.

Affected Products

• Oracle Java SE 23, Oracle JDK 23, Oracle JRE 23
• Oracle GraalVM for JDK: versions 17.0.12, 21.0.4, 23
• Oracle GraalVM Enterprise Edition: versions 20.3.15 and 21.3.11
• NetApp Bootstrap OS (via HCI Compute Node)
• NetApp HCI Compute Node

Discovery Timeline

• 2024-10-15 - CVE-2024-21211 published to NVD
• 2025-06-23 - Last updated in NVD database

Technical Details for CVE-2024-21211

Vulnerability Analysis

This vulnerability resides in the Compiler component of Oracle's Java runtime environments and GraalVM products. The flaw is classified under CWE-922 (Insecure Storage of Sensitive Information), indicating that the vulnerability relates to improper handling of sensitive data within the compiler subsystem.

The attack requires network access but is difficult to exploit due to high attack complexity. An attacker does not need any privileges or user interaction to attempt exploitation. The vulnerability's impact is limited to integrity, meaning successful exploitation allows unauthorized modification of some accessible data but does not affect confidentiality or availability.

Root Cause

The root cause is related to insecure storage of sensitive information (CWE-922) within the Compiler component. This weakness allows attackers to potentially manipulate data through the compilation process when processing untrusted input. The vulnerability exists in how the JIT (Just-In-Time) compiler handles certain data structures or compilation artifacts.

Attack Vector

The vulnerability is exploitable over the network through multiple protocols. Attack scenarios include:

1. Web Service Exploitation: Attackers can exploit this vulnerability through web services that supply data to the affected Compiler APIs, potentially manipulating the compilation process remotely.

2. Sandboxed Applet/Web Start Attacks: In environments where Java Web Start applications or Java applets run untrusted code within a sandbox, attackers can craft malicious code that exploits the compiler vulnerability to bypass intended data integrity protections.

3. API Manipulation: By supplying specially crafted input to APIs that interact with the Compiler component, attackers can trigger the vulnerability to modify data in an unauthorized manner.

The exploitation requires high complexity conditions to be met, which reduces the likelihood of successful attacks in practice.

Detection Methods for CVE-2024-21211

Indicators of Compromise

• Unexpected modifications to compiled Java bytecode or native code artifacts
• Anomalous network connections to Java-based web services from untrusted sources
• Unusual JIT compilation behavior or compiler-related error messages in application logs
• Evidence of sandboxed applet or Web Start applications processing untrusted content

Detection Strategies

• Monitor Java application logs for compiler-related anomalies or unexpected recompilation events
• Implement network traffic analysis to detect suspicious patterns targeting Java web services
• Deploy runtime application self-protection (RASP) solutions to monitor JVM behavior
• Use SentinelOne's behavioral AI to detect anomalous process behavior in Java applications

Monitoring Recommendations

• Enable verbose JVM logging for compiler operations in production environments
• Configure security information and event management (SIEM) alerts for Java-related security events
• Monitor file integrity of compiled class files and JIT-compiled code caches
• Track network connections to Java-based services for unusual access patterns

How to Mitigate CVE-2024-21211

Immediate Actions Required

• Update Oracle Java SE to the latest patched version beyond version 23
• Upgrade Oracle GraalVM for JDK beyond versions 17.0.12, 21.0.4, and 23
• Update Oracle GraalVM Enterprise Edition beyond versions 20.3.15 and 21.3.11
• Review and restrict network access to Java-based web services
• Disable Java Web Start and applet functionality where not required

Patch Information

Oracle has addressed this vulnerability in their October 2024 Critical Patch Update. Administrators should apply the latest security patches available from Oracle's official channels. Refer to the Oracle Security Alert October 2024 for detailed patch information and download links.

NetApp customers should consult the NetApp Security Advisory NTAP-20241018-0008 for guidance on affected NetApp products including Bootstrap OS and HCI Compute Node systems.

Workarounds

• Restrict network access to affected Java deployments using firewall rules or network segmentation
• Disable the loading of untrusted Java applets and Web Start applications in browser settings
• Implement strict input validation for web services that interact with Java Compiler APIs
• Consider using alternative JVM implementations temporarily until patches can be applied

# Configuration example - Restrict Java Web Start and applet execution
# Add to java.security file or deployment.properties
deployment.security.level=VERY_HIGH
deployment.security.askgrantdialog.show=false
deployment.insecure.jres=NEVER