CVE-2022-21340: Oracle GraalVM DOS Vulnerability

CVE-2022-21340 Overview

CVE-2022-21340 is a denial of service vulnerability in 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 (partial DoS) condition against affected Java deployments. The vulnerability is particularly concerning for environments running sandboxed Java Web Start applications or Java applets that load and execute untrusted code from the internet, as well as web services that supply data to the vulnerable APIs.

Critical Impact

Unauthenticated remote attackers can disrupt availability of Java-based applications and services without any user interaction, affecting enterprise infrastructure running vulnerable Oracle Java SE, OpenJDK, or GraalVM Enterprise Edition versions.

Affected Products

• Oracle Java SE: 7u321, 8u311, 11.0.13, 17.0.1
• Oracle GraalVM Enterprise Edition: 20.3.4, 21.3.0
• Oracle OpenJDK: 7 (through update 321), 8 (through update 312), 11 (through 11.0.13), 17 and 17.0.1
• NetApp Products: Active IQ Unified Manager, OnCommand Insight, Cloud Insights Acquisition Unit, E-Series SANtricity products, SnapManager, SolidFire, and HCI Management Node
• Debian Linux: 9.0, 10.0, 11.0

Discovery Timeline

• January 19, 2022 - CVE-2022-21340 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-21340

Vulnerability Analysis

This vulnerability resides in the Libraries component of Oracle Java SE and GraalVM Enterprise Edition. The flaw allows remote exploitation without authentication, requiring no privileges or user interaction to trigger. When successfully exploited, an attacker can cause resource consumption or processing delays that result in partial service disruption.

The vulnerability affects both client-side and server-side Java deployments. On the client side, it impacts sandboxed Java Web Start applications and Java applets that process untrusted code from external sources. On the server side, the vulnerability can be triggered through APIs that accept external data, making web services and application servers potential targets.

Root Cause

The vulnerability stems from improper handling within the Java Libraries component. While Oracle has not disclosed specific technical details about the underlying flaw, the vulnerability classification indicates insufficient input validation or resource management within library functions that can be triggered through network-accessible protocols. The lack of proper bounds checking or resource limits allows attackers to induce denial of service conditions.

Attack Vector

The attack vector for CVE-2022-21340 is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability through multiple protocols by:

1. Sending specially crafted requests to web services that process data through vulnerable Java Libraries APIs
2. Delivering malicious content to client applications running sandboxed Java applets or Web Start applications
3. Exploiting network-accessible Java applications that rely on the affected Libraries component

The vulnerability does not require the attacker to have any prior access to the target system, and exploitation can occur without any action from legitimate users. While the impact is limited to availability (partial DoS), the ease of exploitation makes this a notable concern for internet-facing Java deployments.

Detection Methods for CVE-2022-21340

Indicators of Compromise

• Unusual resource consumption patterns in Java processes, particularly CPU or memory spikes in the Libraries component
• Increased frequency of partial service outages or slowdowns in Java-based applications
• Network traffic anomalies targeting Java-based web services with malformed or unexpected data patterns
• Application logs showing exceptions or errors originating from Java Libraries functions during processing of external data

Detection Strategies

• Monitor Java application logs for unusual exception patterns in Libraries-related classes
• Implement network monitoring to detect abnormal request patterns targeting Java-based services
• Deploy SentinelOne Singularity platform for real-time behavioral analysis of Java processes and automatic detection of exploitation attempts
• Use application performance monitoring (APM) tools to baseline normal behavior and alert on deviations

Monitoring Recommendations

• Enable verbose logging for Java applications to capture detailed stack traces and error conditions
• Configure alerts for abnormal Java process resource utilization (CPU, memory, thread count)
• Monitor network connections to Java application servers for suspicious patterns or high connection rates
• Implement SentinelOne's runtime protection capabilities to detect and respond to anomalous Java process behavior

How to Mitigate CVE-2022-21340

Immediate Actions Required

• Update Oracle Java SE to versions newer than 7u321, 8u311, 11.0.13, or 17.0.1 as applicable to your environment
• Upgrade Oracle GraalVM Enterprise Edition to versions newer than 20.3.4 or 21.3.0
• Apply operating system vendor patches for Debian Linux and other distributions that package affected Java versions
• Review NetApp product deployments and apply relevant security updates per NetApp Security Advisory

Patch Information

Oracle addressed this vulnerability in the January 2022 Critical Patch Update (CPU). Organizations should obtain patches from the Oracle CPU January 2022 Alert. For OpenJDK users, updated packages are available through standard distribution channels. Debian users should apply updates per DSA-5057 and DSA-5058. Gentoo Linux users should reference GLSA 202209-05 for patch guidance.

Workarounds

• Restrict network access to Java-based services using firewall rules to limit exposure to trusted networks only
• Disable Java Web Start and browser-based Java applets if not required for business operations
• Implement web application firewalls (WAF) to filter malicious requests targeting Java services
• Isolate Java applications in network segments with limited external exposure until patches can be applied

# Example: Restrict network access to Java application server (Linux iptables)
# Allow only trusted networks to access Java application on port 8080
iptables -A INPUT -p tcp --dport 8080 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -s 192.168.0.0/16 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP