CVE-2022-21283: Oracle GraalVM DOS Vulnerability

CVE-2022-21283 Overview

CVE-2022-21283 is a denial of service vulnerability in the Libraries component of Oracle Java SE and Oracle GraalVM Enterprise Edition. This easily exploitable vulnerability allows unauthenticated attackers with network access to compromise affected Java deployments via multiple protocols, resulting in a partial denial of service condition.

The vulnerability is particularly concerning for Java deployments running sandboxed Java Web Start applications or sandboxed Java applets that load and execute untrusted code from the internet while relying on the Java sandbox for security. Additionally, the vulnerability can be exploited through APIs in the affected component, such as web services that supply data to these APIs.

Critical Impact

Unauthenticated remote attackers can cause partial denial of service in affected Oracle Java SE and GraalVM Enterprise Edition deployments through network-accessible protocols without user interaction.

Affected Products

• Oracle Java SE: 11.0.13, 17.0.1
• Oracle GraalVM Enterprise Edition: 20.3.4, 21.3.0
• Oracle OpenJDK: Multiple versions including 7.x, 8.x, 11.x, and 17.x series
• 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 SAN tricity products, HCI Management Node, OnCommand Insight, OnCommand Workflow Automation, Santricity products, SnapManager, SolidFire

Discovery Timeline

• January 19, 2022 - CVE-2022-21283 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-21283

Vulnerability Analysis

This vulnerability resides in the Libraries component of Oracle Java SE and Oracle GraalVM Enterprise Edition. The flaw enables remote attackers to trigger a partial denial of service condition without requiring any privileges or user interaction. The vulnerability affects the availability of the system while confidentiality and integrity remain unaffected.

The ease of exploitation combined with network accessibility makes this vulnerability exploitable in client-side scenarios where sandboxed Java applications process untrusted content, as well as server-side scenarios where Java APIs receive data from external sources such as web services.

Root Cause

The root cause relates to improper handling within the Java Libraries component. When processing specially crafted input through network protocols, the affected component fails to properly manage resources or validate input, leading to a denial of service condition. The exact technical details are classified as "NVD-CWE-noinfo," indicating the specific weakness type was not disclosed by Oracle.

Attack Vector

The attack vector is network-based, requiring no authentication and no user interaction. An attacker can exploit this vulnerability through multiple network protocols by:

1. Client-side exploitation: Targeting sandboxed Java Web Start applications or Java applets that process untrusted code from the internet
2. Server-side exploitation: Sending malicious data to web services or APIs that utilize the vulnerable Libraries component

The vulnerability can be triggered remotely by any unauthenticated attacker with network access to the target system running affected Java versions.

The vulnerability manifests in the Java Libraries component when processing network-accessible data. Exploitation involves sending specially crafted requests through network protocols that trigger resource exhaustion or improper exception handling within the Libraries component. For detailed technical analysis, refer to the Oracle CPU January 2022 Alert.

Detection Methods for CVE-2022-21283

Indicators of Compromise

• Unusual spikes in Java process CPU or memory consumption without corresponding legitimate workload increases
• Java application crashes or service interruptions correlating with external network traffic patterns
• Abnormal network connections to Java-based services from untrusted sources
• Application logs showing repeated exceptions or errors in the Java Libraries component

Detection Strategies

• Monitor Java process resource utilization for anomalous patterns indicating potential DoS attacks
• Implement network traffic analysis to detect malformed or suspicious requests targeting Java-based services
• Deploy application performance monitoring to identify degradation in Java application responsiveness
• Configure logging to capture detailed information about library operations and network data processing

Monitoring Recommendations

• Enable verbose garbage collection logging to detect memory exhaustion patterns
• Implement alerting on Java application availability and response time thresholds
• Monitor inbound network traffic to Java web services for volume anomalies or suspicious payloads
• Review Java application logs for recurring exceptions in the Libraries component

How to Mitigate CVE-2022-21283

Immediate Actions Required

• Update Oracle Java SE to version 11.0.14 or 17.0.2 or later as applicable
• Update Oracle GraalVM Enterprise Edition to versions newer than 20.3.4 and 21.3.0
• Apply vendor-specific patches for Linux distributions (Debian, Fedora) and NetApp products
• Restrict network access to Java-based services to trusted sources where possible

Patch Information

Oracle addressed this vulnerability in the January 2022 Critical Patch Update. Patches are available through the Oracle CPU January 2022 Alert. Additional patches are available from Linux distributions:

• Debian Security Advisory DSA-5057
• Debian Security Advisory DSA-5058
• Debian LTS Announcement
• NetApp Security Advisory
• Gentoo GLSA 2022-09-05

Workarounds

• Disable Java Web Start and Java applets if not required for business operations
• Implement network-level filtering to block untrusted traffic to Java-based services
• Configure web application firewalls to inspect and filter traffic destined for Java endpoints
• Apply principle of least privilege to Java applications and restrict their network exposure

# Example: Verify Java version and check if patched
java -version
# Ensure version is 11.0.14+, 17.0.2+, or apply appropriate vendor patches

# Example: Restrict Java network access using firewall rules (iptables)
# Limit access to Java application port (example: 8080) to trusted networks
iptables -A INPUT -p tcp --dport 8080 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP