CVE-2022-21293: Oracle GraalVM DOS Vulnerability

CVE-2022-21293 Overview

CVE-2022-21293 is a denial of service vulnerability affecting the Libraries component in Oracle Java SE and Oracle GraalVM Enterprise Edition. This easily exploitable flaw allows an unauthenticated attacker with network access via multiple protocols to compromise affected systems, resulting in a partial denial of service condition.

The vulnerability is particularly concerning for Java deployments that run sandboxed Java Web Start applications or sandboxed Java applets, which load and execute untrusted code from external sources such as the internet and depend on the Java sandbox for security isolation. Additionally, this vulnerability can be exploited through APIs in the affected component, including scenarios where web services supply data to vulnerable APIs.

Critical Impact
Unauthenticated remote attackers can cause partial denial of service affecting application availability without requiring any user interaction or special privileges.

Affected Products

Oracle Java SE: 7u321, 8u311, 11.0.13, 17.0.1
Oracle GraalVM Enterprise Edition: 20.3.4 and 21.3.0
Oracle OpenJDK: Multiple versions including 7.x through 17.0.1
Debian Linux: 9.0, 10.0, 11.0
Fedora: 34
NetApp Products: 7-Mode Transition Tool, Active IQ Unified Manager, Cloud Insights Acquisition Unit, Cloud Secure Agent, E-Series SANtricity products, HCI Management Node, OnCommand products, SnapManager, SolidFire

Discovery Timeline

2022-01-19 - CVE-2022-21293 published to NVD
2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-21293

Vulnerability Analysis

This vulnerability resides within the Libraries component of Oracle Java SE and Oracle GraalVM Enterprise Edition. The flaw enables remote exploitation without authentication, meaning any attacker with network connectivity to an affected system can potentially trigger the vulnerability. The attack does not require any user interaction, making it suitable for automated exploitation attempts.

The impact is limited to availability, with no effect on confidentiality or integrity of the affected systems. When successfully exploited, attackers can induce a partial denial of service state, potentially disrupting Java-based applications and services.

Root Cause

The vulnerability stems from improper handling within the Libraries component of Java SE. While specific implementation details have not been publicly disclosed by Oracle, the flaw allows processing of malicious input that can degrade service availability. The issue affects the core library functionality that is fundamental to Java runtime operations.

Attack Vector

The attack vector is network-based, allowing exploitation through multiple protocols. An attacker can target this vulnerability in two primary scenarios:

Client-side attacks: Targeting Java Web Start applications or Java applets that execute untrusted code from the internet within a sandboxed environment. Despite the sandbox, this vulnerability can still be triggered.
Server-side attacks: Exploiting web services or APIs that utilize the vulnerable Libraries component to process externally supplied data. This is particularly relevant for enterprise Java applications that accept and process remote input.

The attack requires no authentication or user interaction, and the complexity is low, making it accessible to attackers with minimal technical sophistication.

Detection Methods for CVE-2022-21293

Indicators of Compromise

Unusual spikes in Java process resource consumption without corresponding legitimate workload
Repeated exceptions or errors in Java application logs related to library operations
Degraded performance or partial unavailability of Java-based services
Network traffic patterns indicating automated probing of Java endpoints

Detection Strategies

Monitor Java applications for abnormal memory usage patterns and CPU spikes that could indicate exploitation attempts
Implement application-level logging to capture unusual API calls to Libraries component functions
Deploy network intrusion detection systems with signatures for known Java exploitation patterns
Enable Java security manager logging to identify attempts to bypass sandbox restrictions

Monitoring Recommendations

Configure alerting for Java runtime exceptions that may indicate denial of service attempts
Establish baseline metrics for Java application performance to detect anomalies
Monitor web service endpoints that utilize Java for unusual traffic patterns or request characteristics
Review system logs for evidence of service degradation correlated with external access attempts

How to Mitigate CVE-2022-21293

Immediate Actions Required

Update Oracle Java SE to version 7u331, 8u321, 11.0.14, or 17.0.2 or later
Update Oracle GraalVM Enterprise Edition to version 20.3.5, 21.3.1, or later
Apply patches from Linux distribution repositories for Debian, Fedora, and other affected platforms
If immediate patching is not possible, restrict network access to Java-based services to trusted sources only

Patch Information

Oracle released patches addressing this vulnerability as part of the Oracle January 2022 Critical Patch Update. Organizations should prioritize applying these updates, particularly for internet-facing Java applications and services.

Additional security advisories have been issued by:

Workarounds

Disable Java Web Start and Java applets if not required for business operations
Implement network segmentation to isolate Java-based services from untrusted networks
Configure web application firewalls to filter potentially malicious requests targeting Java endpoints
Restrict execution of untrusted Java code through security policies and sandboxing configurations

bash

# Verify Java version to confirm patching status
java -version

# For systems using alternatives, verify the active Java installation
update-alternatives --display java

# Check for outdated Java installations that may still be present
find /usr -name "java" -type f -exec {} -version \; 2>/dev/null