CVE-2022-21294: Oracle GraalVM DoS Vulnerability

CVE-2022-21294 Overview

CVE-2022-21294 is a denial of service vulnerability affecting the Libraries component of Oracle Java SE and Oracle GraalVM Enterprise Edition. This easily exploitable vulnerability allows an unauthenticated attacker with network access via multiple protocols to cause a partial denial of service condition against affected Java deployments.

The vulnerability impacts both client-side Java applications (such as sandboxed Java Web Start applications and Java applets that load untrusted code from the internet) as well as server-side deployments where APIs in the Libraries component process externally-supplied data, including web services.

Critical Impact

Unauthenticated attackers can remotely trigger partial denial of service conditions against Java applications through network-accessible protocols without user interaction.

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, 8, 11, and 17 branches
• NetApp Products: 7-Mode Transition Tool, Active IQ Unified Manager, Cloud Insights Acquisition Unit, E-Series SAN products, OnCommand products, SnapManager, and SolidFire
• Debian Linux: 9.0, 10.0, and 11.0

Discovery Timeline

• January 19, 2022 - CVE-2022-21294 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-21294

Vulnerability Analysis

This vulnerability exists within the Libraries component of Oracle Java SE and Oracle GraalVM Enterprise Edition. The flaw allows remote attackers to negatively impact the availability of affected Java applications without requiring authentication or user interaction.

The vulnerability specifically affects Java deployments that process untrusted input, whether through sandboxed client applications running code from the internet or through server-side APIs that handle external data. The attack can be launched over multiple network protocols, making it accessible from various network vantage points.

While the vulnerability only enables partial denial of service (meaning it degrades but may not completely halt service), the ease of exploitation and lack of authentication requirements make it a concern for publicly accessible Java applications.

Root Cause

The vulnerability stems from improper handling within the Libraries component of Java SE. While Oracle has not disclosed specific technical details about the root cause, the vulnerability classification indicates an issue with how the Libraries component processes certain inputs, leading to resource consumption or service degradation that can be triggered remotely.

The "NVD-CWE-noinfo" classification indicates that detailed weakness enumeration information has not been publicly disclosed, which is typical for Oracle Java vulnerabilities to prevent exploitation before patches are widely deployed.

Attack Vector

The attack can be executed remotely over the network without requiring any user interaction or authentication. An attacker can exploit this vulnerability through:

1. Client-side attacks: Targeting sandboxed Java Web Start applications or Java applets that load and execute untrusted code from the internet
2. Server-side attacks: Supplying malicious data to web services or APIs that utilize the affected Libraries component

The network-based attack vector with no prerequisites makes this vulnerability accessible to a wide range of potential attackers. The lack of authentication requirements means any network-adjacent or internet-facing Java deployment could potentially be targeted.

Detection Methods for CVE-2022-21294

Indicators of Compromise

• Unusual resource consumption patterns in Java processes, particularly related to Libraries component operations
• Increased network traffic to Java-based web services from unknown or suspicious sources
• Application performance degradation or partial service outages affecting Java deployments
• Log entries indicating exceptions or errors within Java SE Libraries component

Detection Strategies

• Monitor Java application logs for unusual exceptions or errors in the Libraries component that could indicate exploitation attempts
• Implement network-level monitoring to detect abnormal traffic patterns targeting Java-based services
• Use application performance monitoring (APM) tools to identify sudden degradation in Java application responsiveness
• Deploy SentinelOne Singularity Platform for real-time threat detection and behavioral analysis of Java processes

Monitoring Recommendations

• Enable verbose logging for Java applications to capture detailed information about Libraries component operations
• Configure alerts for sudden increases in Java process resource utilization (CPU, memory)
• Monitor web service endpoints that accept external data for unusual request patterns
• Implement rate limiting on publicly accessible Java APIs to mitigate potential DoS attempts

How to Mitigate CVE-2022-21294

Immediate Actions Required

• Upgrade Oracle Java SE to versions newer than 7u321, 8u311, 11.0.13, or 17.0.1 that contain the security fix
• Update Oracle GraalVM Enterprise Edition beyond versions 20.3.4 and 21.3.0
• Apply vendor-specific patches for NetApp products as detailed in NetApp Security Advisory NTAP-20220121-0007
• Update Debian systems using the packages referenced in DSA-5057 and DSA-5058

Patch Information

Oracle addressed this vulnerability in the January 2022 Critical Patch Update (CPU). The official security advisory is available at the Oracle January 2022 CPU Advisory. Organizations should apply the appropriate patch based on their Java SE version:

• Java SE 7: Update to a version newer than 7u321
• Java SE 8: Update to a version newer than 8u311
• Java SE 11: Update to a version newer than 11.0.13
• Java SE 17: Update to a version newer than 17.0.1
• GraalVM Enterprise Edition: Update beyond 20.3.4 or 21.3.0

Linux distributions have released their own security updates. Debian users should consult Debian LTS Announcement and Gentoo users should refer to GLSA 202209-05.

Workarounds

• Disable Java Web Start and browser-based Java applets in environments where they are not required
• Implement network segmentation to limit exposure of Java-based services to untrusted networks
• Configure web application firewalls (WAF) to filter suspicious requests to Java-based APIs
• Apply rate limiting on network endpoints that interface with Java applications to mitigate DoS impact

# Example: Check current Java version to determine if patching is required
java -version

# Example: Update Java on Debian-based systems
sudo apt update
sudo apt upgrade openjdk-11-jdk

# Example: Disable Java plugin in browsers (if applicable)
# Remove or rename the Java plugin files in browser plugin directories