CVE-2020-14796 Overview
CVE-2020-14796 is an information disclosure vulnerability in the Libraries component of Oracle Java SE and Java SE Embedded. This vulnerability allows an unauthenticated attacker with network access via multiple protocols to compromise affected Java deployments, potentially resulting in unauthorized read access to a subset of accessible data. The vulnerability is difficult to exploit and requires human interaction from a person other than the attacker, making successful exploitation more complex.
This vulnerability specifically affects Java deployments that run sandboxed Java Web Start applications or sandboxed Java applets that load and execute untrusted code from external sources such as the internet. Organizations relying on the Java sandbox for security in client-side deployments should take note. Server-side Java deployments that only execute trusted, administrator-installed code are not affected by this vulnerability.
Critical Impact
Successful exploitation allows unauthorized read access to sensitive data within affected Java SE and Java SE Embedded environments running untrusted code in sandboxed configurations.
Affected Products
- Oracle JDK 1.7.0 Update 271, 1.8.0 Update 261, 11.0.8, and 15
- Oracle JRE 1.7.0 Update 271, 1.8.0 Update 261, 11.0.8, and 15
- Oracle OpenJDK 7 through Update 271, 8 through Update 262, 11 through 11.0.8, 13 through 13.0.4, and 15
- Java SE Embedded 8u261
- NetApp products including Active IQ Unified Manager, E-Series SANtricity products, HCI Management Node, OnCommand Insight, and SnapManager
- Debian Linux 9.0 and 10.0
- openSUSE Leap 15.2
Discovery Timeline
- October 21, 2020 - CVE-2020-14796 published to NVD
- May 27, 2025 - Last updated in NVD database
Technical Details for CVE-2020-14796
Vulnerability Analysis
This vulnerability resides in the Libraries component of Oracle Java SE and affects how the Java runtime handles certain operations when executing sandboxed applications. The flaw enables an attacker to bypass security restrictions and gain unauthorized read access to data that should be protected by the Java sandbox security model.
The attack requires network access and can be executed via multiple protocols, providing flexibility in the attack vector. However, exploitation is considered difficult due to the high complexity involved. Additionally, successful exploitation requires that a victim user interact with malicious content, adding another layer of difficulty for potential attackers.
The confidentiality impact is limited to a subset of accessible data rather than full system compromise. No integrity or availability impacts have been identified with this vulnerability. The vulnerability applies specifically to client-side Java deployments running untrusted code in sandboxed environments, while server deployments running only trusted code remain unaffected.
Root Cause
The vulnerability stems from improper security controls within the Java SE Libraries component. When sandboxed Java applications process certain operations, the security boundaries enforced by the Java sandbox can be circumvented, allowing unauthorized data access. The specific technical implementation flaw has not been publicly disclosed in detail by Oracle.
Attack Vector
An attacker can exploit this vulnerability by crafting malicious content that, when processed by a sandboxed Java application, bypasses security restrictions to access protected data. The attack requires the following conditions:
- The target system must be running an affected version of Java SE or Java SE Embedded
- The deployment must involve sandboxed Java Web Start applications or Java applets that execute untrusted code
- A user must interact with the malicious content (e.g., visiting a webpage containing a malicious applet)
- The attacker must have network access to deliver the malicious payload
The vulnerability exploits weaknesses in how the Libraries component enforces sandbox security boundaries. When triggered, the attacker gains read access to a subset of data that would normally be protected by sandbox restrictions.
Detection Methods for CVE-2020-14796
Indicators of Compromise
- Unexpected network connections from Java processes to unknown external hosts
- Anomalous Java applet or Web Start application execution patterns in browser logs
- Suspicious access patterns to local files or resources from sandboxed Java applications
- Unusual data exfiltration activity from systems running affected Java versions
Detection Strategies
- Monitor Java process activity for attempts to access resources outside sandbox boundaries
- Implement network traffic analysis to detect suspicious outbound connections from Java applications
- Review browser plugin logs for unexpected Java applet or Web Start application executions
- Deploy endpoint detection rules to identify exploitation attempts targeting Java Libraries component
Monitoring Recommendations
- Enable verbose logging for Java Web Start and applet activity in client environments
- Configure SentinelOne Singularity platform to monitor Java process behaviors and network connections
- Implement file integrity monitoring on systems running affected Java versions
- Establish baseline behavior for Java applications to detect anomalous activity patterns
How to Mitigate CVE-2020-14796
Immediate Actions Required
- Update Java SE installations to the latest patched versions released after October 2020
- For Java SE 7: Upgrade beyond Update 271
- For Java SE 8: Upgrade beyond Update 261
- For Java SE 11: Upgrade beyond version 11.0.8
- For Java SE 15: Apply the latest available patches
- Review and restrict execution of untrusted Java applets and Web Start applications
Patch Information
Oracle addressed this vulnerability in the October 2020 Critical Patch Update (CPU). Organizations should apply the appropriate patches based on their Java version:
- Java SE 7: Update to a version newer than 7u271
- Java SE 8: Update to a version newer than 8u261
- Java SE 11: Update to a version newer than 11.0.8
- Java SE 15: Apply patches from the October 2020 CPU
Additional security advisories are available from Debian Security Advisory DSA-4779, Gentoo GLSA #202101-19, and NetApp Security Advisory NTAP-20201023-0004.
Workarounds
- Disable Java applets and Web Start applications in browser settings if not required for business operations
- Configure network firewalls to restrict outbound connections from Java processes
- Implement application whitelisting to prevent execution of untrusted Java code
- Consider migrating away from Java applets to modern web technologies where feasible
# Disable Java Plugin in browsers by removing or renaming plugin files
# For Linux systems, locate and backup the Java browser plugin
find /usr/lib/jvm -name "libnpjp2.so" -exec mv {} {}.disabled \;
# Configure Java deployment.properties to disable web start
echo "deployment.webjava.enabled=false" >> ~/.java/deployment/deployment.properties
echo "deployment.javaws.autodownload=NEVER" >> ~/.java/deployment/deployment.properties
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
