An OpenJDK security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.

USN-4892-1: OpenJDK vulnerability

=========================================================================
Ubuntu Security Notice USN-4892-1
April 27, 2021

openjdk-8, openjdk-lts vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

OpenJDK's security restriction could be bypassed when verifying Jar
signatures.

Software Description:
- openjdk-8: Open Source Java implementation
- openjdk-lts: Open Source Java implementation

Details:

It was discovered that OpenJDK incorrectly verified Jar signatures. An
attacker could possibly use this issue to bypass intended security
restrictions when using Jar files signed with a disabled algorithm.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
openjdk-11-jdk 11.0.11+9-0ubuntu2~20.10
openjdk-11-jre 11.0.11+9-0ubuntu2~20.10
openjdk-11-jre-headless 11.0.11+9-0ubuntu2~20.10
openjdk-11-jre-zero 11.0.11+9-0ubuntu2~20.10
openjdk-8-jdk 8u292-b10-0ubuntu1~20.10
openjdk-8-jre 8u292-b10-0ubuntu1~20.10
openjdk-8-jre-headless 8u292-b10-0ubuntu1~20.10
openjdk-8-jre-zero 8u292-b10-0ubuntu1~20.10

Ubuntu 20.04 LTS:
openjdk-11-jdk 11.0.11+9-0ubuntu2~20.04
openjdk-11-jre 11.0.11+9-0ubuntu2~20.04
openjdk-11-jre-headless 11.0.11+9-0ubuntu2~20.04
openjdk-11-jre-zero 11.0.11+9-0ubuntu2~20.04
openjdk-8-jdk 8u292-b10-0ubuntu1~20.04
openjdk-8-jre 8u292-b10-0ubuntu1~20.04
openjdk-8-jre-headless 8u292-b10-0ubuntu1~20.04
openjdk-8-jre-zero 8u292-b10-0ubuntu1~20.04

Ubuntu 18.04 LTS:
openjdk-11-jdk 11.0.11+9-0ubuntu2~18.04
openjdk-11-jre 11.0.11+9-0ubuntu2~18.04
openjdk-11-jre-headless 11.0.11+9-0ubuntu2~18.04
openjdk-11-jre-zero 11.0.11+9-0ubuntu2~18.04
openjdk-8-jdk 8u292-b10-0ubuntu1~18.04
openjdk-8-jre 8u292-b10-0ubuntu1~18.04
openjdk-8-jre-headless 8u292-b10-0ubuntu1~18.04
openjdk-8-jre-zero 8u292-b10-0ubuntu1~18.04

Ubuntu 16.04 LTS:
openjdk-8-jdk 8u292-b10-0ubuntu1~16.04.1
openjdk-8-jre 8u292-b10-0ubuntu1~16.04.1
openjdk-8-jre-headless 8u292-b10-0ubuntu1~16.04.1
openjdk-8-jre-zero 8u292-b10-0ubuntu1~16.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any Java
applications or applets to make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4892-1
CVE-2021-2163

Package Information:
  https://launchpad.net/ubuntu/+source/openjdk-8/8u292-b10-0ubuntu1~20.10
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.11+9-0ubuntu2~20.10
  https://launchpad.net/ubuntu/+source/openjdk-8/8u292-b10-0ubuntu1~20.04
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.11+9-0ubuntu2~20.04
  https://launchpad.net/ubuntu/+source/openjdk-8/8u292-b10-0ubuntu1~18.04
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.11+9-0ubuntu2~18.04
  https://launchpad.net/ubuntu/+source/openjdk-8/8u292-b10-0ubuntu1~16.04.1