CVE-2022-21349: Oracle GraalVM DoS Vulnerability

CVE-2022-21349 Overview

CVE-2022-21349 is a denial of service vulnerability affecting Oracle Java SE and Oracle GraalVM Enterprise Edition in the 2D component. This easily exploitable vulnerability allows an unauthenticated attacker with network access via multiple protocols to cause a partial denial of service (partial DoS) against affected systems. The vulnerability impacts Java deployments that run untrusted code, particularly in sandboxed Java Web Start applications and Java applets that load code from the internet and depend on the Java sandbox for security. Additionally, the vulnerability can be exploited through web services that supply data to the affected 2D component APIs.

Critical Impact

Unauthenticated remote attackers can cause service degradation by exploiting the Java 2D component, affecting availability of Java-based applications and services across enterprise environments.

Affected Products

• Oracle Java SE: 7u321, 8u311
• Oracle GraalVM Enterprise Edition: 20.3.4, 21.3.0
• Oracle OpenJDK 7 (through update 321) and OpenJDK 8 (through update 312)
• NetApp products: 7-Mode Transition Tool, Cloud Insights, E-Series SANtricity OS Controller, E-Series SANtricity Storage Manager, E-Series SANtricity Web Services, HCI Management Node, OnCommand Insight, OnCommand Workflow Automation, SANtricity Unified Manager, SnapManager, SolidFire
• Debian Linux 9.0

Discovery Timeline

• January 19, 2022 - CVE-2022-21349 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-21349

Vulnerability Analysis

The vulnerability resides in the 2D graphics component of Oracle Java SE and Oracle GraalVM Enterprise Edition. The 2D component handles rendering operations including image processing, font management, and graphical output. When processing specially crafted input, the component fails to properly validate or handle certain data, allowing an attacker to trigger conditions that degrade service availability.

This vulnerability is particularly concerning because it can be triggered remotely without authentication and does not require user interaction. Attackers can exploit this flaw either through sandboxed Java applications (applets, Web Start) that process untrusted content, or directly through API calls in web services that expose the vulnerable 2D component functionality.

Root Cause

The root cause involves improper handling within the Java 2D graphics subsystem. While Oracle has not disclosed specific technical details (classified as NVD-CWE-noinfo), the vulnerability appears to stem from inadequate input validation or resource management in the 2D rendering pipeline. When the component processes malicious input, it can enter a state that consumes excessive resources or becomes partially unresponsive, resulting in degraded availability.

Attack Vector

The attack vector is network-based and can be exploited through multiple protocols. An attacker does not need authentication or privileges to exploit this vulnerability. The attack works in two primary scenarios:

Client-Side Attack: An attacker hosts malicious content that triggers the vulnerability when a victim loads it in a Java applet or Web Start application. The sandboxed environment is bypassed because the vulnerability exists in the underlying Java runtime.

Server-Side Attack: An attacker sends crafted requests to a web service or application server that processes the malicious data using the vulnerable 2D APIs. This could include image processing services, PDF generators, or any application that renders graphics using Java's 2D libraries.

The exploitation does not result in code execution or data exfiltration—it specifically targets availability by causing partial denial of service conditions.

Detection Methods for CVE-2022-21349

Indicators of Compromise

• Unusual CPU or memory consumption by Java processes, particularly those handling graphics rendering operations
• Increased frequency of partial application hangs or timeouts in Java-based services
• Error logs showing 2D component exceptions or failures during image/graphics processing
• Network traffic containing malformed image data or unusual API calls to graphics-related endpoints

Detection Strategies

• Deploy application performance monitoring (APM) to detect anomalous resource consumption in Java processes
• Implement logging for Java 2D component operations to identify patterns consistent with exploitation attempts
• Use SentinelOne's runtime protection to monitor Java application behavior and detect deviation from baseline performance metrics
• Configure intrusion detection systems to flag unusual network patterns targeting Java-based web services

Monitoring Recommendations

• Monitor Java heap usage and garbage collection patterns for signs of resource exhaustion attacks
• Track application response times and set alerts for degradation thresholds
• Review Java process logs for repeated 2D rendering failures that could indicate exploitation attempts
• Implement network-level monitoring for services that expose Java graphics processing capabilities

How to Mitigate CVE-2022-21349

Immediate Actions Required

• Update Oracle Java SE to versions newer than 7u321 and 8u311 as specified in Oracle's January 2022 Critical Patch Update
• Upgrade Oracle GraalVM Enterprise Edition to versions newer than 20.3.4 and 21.3.0
• Apply vendor-specific patches for affected NetApp products as detailed in NetApp Security Advisory NTAP-20220121-0007
• For Debian systems, apply updates as described in the Debian LTS Announcement

Patch Information

Oracle addressed this vulnerability in the January 2022 Critical Patch Update (CPU). The patch is available through Oracle's standard software update mechanisms. For detailed patch information and download links, refer to the Oracle CPU January 2022 Alert.

Organizations using OpenJDK should update to versions that incorporate the fix. Gentoo Linux users should follow the guidance in Gentoo GLSA 202209-05.

Workarounds

• Restrict network access to Java-based services that process untrusted graphics content
• Disable Java applets and Web Start functionality in environments where they are not required
• Implement strict input validation for any external data processed by Java 2D APIs
• Consider using web application firewalls to filter potentially malicious requests to Java graphics services
• Isolate Java applications that must process untrusted content in sandboxed network segments

# Verify installed Java version to determine vulnerability status
java -version

# Check for affected versions and update accordingly
# For RHEL/CentOS systems:
yum update java-1.8.0-openjdk

# For Debian/Ubuntu systems:
apt update && apt upgrade openjdk-8-jdk