CVE-2020-14782 Overview
CVE-2020-14782 is a security vulnerability affecting the Libraries component of Oracle Java SE and Java SE Embedded products. This vulnerability allows an unauthenticated attacker with network access to compromise Java installations through multiple protocols, potentially resulting in unauthorized modification of accessible data.
The vulnerability applies to both client and server deployments of Java and can be exploited through sandboxed Java Web Start applications, sandboxed Java applets, or by supplying malicious data to APIs in the Libraries component without using sandboxed environments—such as through web services.
Critical Impact
Successful exploitation enables unauthorized update, insert, or delete access to some Java SE and Java SE Embedded accessible data, compromising data integrity across affected systems.
Affected Products
- Oracle JDK 7u271, 8u261, 11.0.8, and 15
- Oracle JRE 7u271, 8u261, 11.0.8, and 15
- Oracle OpenJDK 7 through 7u271, 8 through 8u262, 11 through 11.0.8, 13 through 13.0.4, and 15
- Java SE Embedded 8u261
- Debian Linux 9.0 and 10.0
- NetApp Active IQ Unified Manager, E-Series products, OnCommand Insight, OnCommand Workflow Automation, Santricity Unified Manager, and SteelStore Cloud Integrated Storage
- McAfee ePolicy Orchestrator 5.9.x and 5.10.x
- openSUSE Leap 15.2
Discovery Timeline
- October 21, 2020 - CVE-2020-14782 published to NVD
- May 27, 2025 - Last updated in NVD database
Technical Details for CVE-2020-14782
Vulnerability Analysis
This vulnerability resides in the Libraries component of Java SE, which is a fundamental part of the Java runtime environment responsible for core functionality. The flaw allows network-based attacks that can modify data accessible to the Java application without requiring any privileges or user interaction.
The attack complexity is high, meaning successful exploitation requires specific conditions to be met. While the vulnerability does not impact confidentiality or availability, it enables integrity violations where attackers can insert, update, or delete data within the scope of the affected Java application. This makes it particularly concerning for applications that rely on data integrity for critical business processes.
Root Cause
The root cause stems from an unspecified flaw in the Java SE Libraries component that fails to properly validate or sanitize certain inputs. This improper input handling allows remote attackers to manipulate data through network protocols when specific conditions are met.
The vulnerability's classification as "NVD-CWE-noinfo" indicates that Oracle has not disclosed the specific weakness type, which is common for vulnerabilities where detailed technical information could facilitate exploitation.
Attack Vector
The vulnerability can be exploited through multiple attack vectors:
Sandboxed Java Web Start Applications: Attackers can craft malicious Java Web Start applications that, when executed by a victim, exploit the vulnerability despite sandbox restrictions.
Sandboxed Java Applets: Similarly, malicious Java applets embedded in web pages can exploit this flaw within the browser's sandbox environment.
Direct API Access: The vulnerability can also be triggered by supplying crafted data directly to vulnerable APIs in the Libraries component, such as through web services or other network-accessible interfaces.
The exploitation is network-based and requires no authentication or user interaction, though the high attack complexity means successful attacks depend on specific environmental conditions being present.
Detection Methods for CVE-2020-14782
Indicators of Compromise
- Unexpected data modifications in Java-based applications without corresponding authorized user actions
- Anomalous network traffic patterns targeting Java application endpoints with unusual API calls to Libraries component functions
- Java process behavior indicating sandbox escape attempts or unusual memory access patterns
Detection Strategies
- Deploy application-level monitoring to track data modification events in Java applications, correlating changes with authenticated user sessions
- Implement network intrusion detection rules to identify suspicious traffic patterns targeting Java RMI, JNDI, or other Java network protocols
- Monitor Java Web Start and applet execution for unusual behavior, particularly applications from untrusted sources
Monitoring Recommendations
- Enable verbose Java security logging to capture detailed information about security manager decisions and sandbox operations
- Configure SentinelOne agents to monitor Java process behavior for indicators of exploitation attempts
- Establish baseline network behavior for Java applications and alert on deviations that may indicate exploitation
How to Mitigate CVE-2020-14782
Immediate Actions Required
- Update all Java SE installations to the latest patched versions beyond 7u271, 8u261, 11.0.8, and 15
- Review and restrict Java Web Start and applet execution policies in enterprise environments
- Disable Java browser plugins if not required for business operations
- Audit applications using Java SE Libraries component for exposure to network-based attacks
Patch Information
Oracle addressed this vulnerability in the October 2020 Critical Patch Update (CPU). Organizations should apply the appropriate updates for their Java versions:
- Java SE 7: Update to versions newer than 7u271
- Java SE 8: Update to versions newer than 8u261
- Java SE 11: Update to versions newer than 11.0.8
- Java SE 15: Apply the latest security patches
For detailed patch information, refer to the Oracle Security Alert CPU October 2020. Additional vendor-specific patches are available from Debian Security Advisory DSA-4779, NetApp Security Advisory, and Gentoo GLSA 202101-19.
Workarounds
- Restrict network access to Java applications by implementing firewall rules that limit inbound connections to trusted sources only
- Configure Java security policies to run untrusted code with minimal permissions using the Java Security Manager
- Disable Java Web Start and browser-based applet execution in environments where these features are not required
- Implement network segmentation to isolate Java-based services from general network traffic
# Example: Restrict Java Web Start execution via deployment.properties
echo "deployment.webjava.enabled=false" >> /etc/.java/deployment/deployment.properties
echo "deployment.insecure.jres=NEVER" >> /etc/.java/deployment/deployment.properties
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
