CVE-2019-2818: Low severity Oracle JDK vulnerability
It was discovered that the ChaCha20Cipher implementation in the Security component of OpenJDK used non-constant time comparison for comparing tags. A remote attacker could possible use the flaw to leak information about decryption state using the timing information.
Other sources
Vulnerability in the Java SE component of Oracle Java SE (subcomponent: Security). Supported versions that are affected are Java SE: 11.0.3 and 12.0.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Java SE accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets (in Java SE 8), that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.0 Base Score 3.1 (Confidentiality impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N).
— Launchpad
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/openjdk-11to a version that resolves this vulnerability.Fixed in 11.0.32.1+1-1 - Upgrade
Upgrade
Oracle Java SE (subcomponent: Security)to a version that resolves this vulnerability.Fixed in 11.0.3 - Upgrade
Upgrade
Oracle Java SE (subcomponent: Security)to a version that resolves this vulnerability.Fixed in 12.0.1 - Compensating control
Because successful exploitation requires human interaction, restrict access to untrusted Java code that requires user interaction (for example, prevent or tightly control Java Web Start/applet execution from internet/untrusted sources on client systems relying on the Java sandbox).
Event History
Frequently Asked Questions
What is the severity of CVE-2019-2818?
The severity of CVE-2019-2818 is low with a CVSS score of 3.1.
Which versions of Java SE are affected by CVE-2019-2818?
Java SE versions 11.0.3 and 12.0.1 are affected by CVE-2019-2818.
How can an attacker exploit CVE-2019-2818?
An unauthenticated attacker with network access can exploit CVE-2019-2818 through multiple protocols to compromise Java SE.
What is the recommended remedy for openjdk-11 on Debian to address CVE-2019-2818?
The recommended remedy for openjdk-11 on Debian is to upgrade to version 11.0.16+8-1~deb10u1 or higher.
What is the recommended remedy for openjdk-12 on Ubuntu to address CVE-2019-2818?
The recommended remedy for openjdk-12 on Ubuntu is to upgrade to version 12.0.2+9-1 or higher.