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

USN-4607-1: OpenJDK vulnerabilities

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Ubuntu Security Notice USN-4607-1
October 27, 2020

openjdk-8, openjdk-lts vulnerabilities
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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:

Several security issues were fixed in OpenJDK.

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

Details:

It was discovered that OpenJDK incorrectly handled deserializing Proxy
class objects with many interfaces. A remote attacker could possibly use
this issue to cause a denial of service (memory consumption) via a
specially crafted input. (CVE-2020-14779)

Sergey Ostanin discovered that OpenJDK incorrectly restricted
authentication mechanisms. A remote attacker could possibly use this
issue to obtain sensitive information over an unencrypted connection.
(CVE-2020-14781)

It was discovered that OpenJDK incorrectly handled untrusted certificates.
An attacker could possibly use this issue to read or write sensitive
information. (CVE-2020-14782)

Zhiqiang Zang discovered that OpenJDK incorrectly checked for integer
overflows. An attacker could possibly use this issue to bypass certain
Java sandbox restrictions. (CVE-2020-14792)

Markus Loewe discovered that OpenJDK incorrectly checked permissions when
converting a file system path to an URI. An attacker could possibly use
this issue to bypass certain Java sandbox restrictions. (CVE-2020-14796)

Markus Loewe discovered that OpenJDK incorrectly checked for invalid
characters when converting an URI to a path. An attacker could possibly
use this issue to read or write sensitive information. (CVE-2020-14797)

Markus Loewe discovered that OpenJDK incorrectly checked the length of
input strings. An attacker could possibly use this issue to bypass certain
Java sandbox restrictions. (CVE-2020-14798)

It was discovered that OpenJDK incorrectly handled boundary checks. An
attacker could possibly use this issue to bypass certain Java sandbox
restrictions. (CVE-2020-14803)

Update instructions:

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

Ubuntu 20.10:
openjdk-11-jdk 11.0.9+11-0ubuntu1
openjdk-11-jre 11.0.9+11-0ubuntu1
openjdk-11-jre-headless 11.0.9+11-0ubuntu1
openjdk-11-jre-zero 11.0.9+11-0ubuntu1
openjdk-8-jdk 8u272-b10-0ubuntu1~20.10
openjdk-8-jre 8u272-b10-0ubuntu1~20.10
openjdk-8-jre-headless 8u272-b10-0ubuntu1~20.10
openjdk-8-jre-zero 8u272-b10-0ubuntu1~20.10

Ubuntu 20.04 LTS:
openjdk-11-jdk 11.0.9+11-0ubuntu1~20.04
openjdk-11-jre 11.0.9+11-0ubuntu1~20.04
openjdk-11-jre-headless 11.0.9+11-0ubuntu1~20.04
openjdk-11-jre-zero 11.0.9+11-0ubuntu1~20.04
openjdk-8-jdk 8u272-b10-0ubuntu1~20.04
openjdk-8-jre 8u272-b10-0ubuntu1~20.04
openjdk-8-jre-headless 8u272-b10-0ubuntu1~20.04
openjdk-8-jre-zero 8u272-b10-0ubuntu1~20.04

Ubuntu 18.04 LTS:
openjdk-11-jdk 11.0.9+11-0ubuntu1~18.04.1
openjdk-11-jre 11.0.9+11-0ubuntu1~18.04.1
openjdk-11-jre-headless 11.0.9+11-0ubuntu1~18.04.1
openjdk-11-jre-zero 11.0.9+11-0ubuntu1~18.04.1
openjdk-8-jdk 8u272-b10-0ubuntu1~18.04
openjdk-8-jre 8u272-b10-0ubuntu1~18.04
openjdk-8-jre-headless 8u272-b10-0ubuntu1~18.04
openjdk-8-jre-zero 8u272-b10-0ubuntu1~18.04

Ubuntu 16.04 LTS:
openjdk-8-jdk 8u272-b10-0ubuntu1~16.04
openjdk-8-jre 8u272-b10-0ubuntu1~16.04
openjdk-8-jre-headless 8u272-b10-0ubuntu1~16.04
openjdk-8-jre-zero 8u272-b10-0ubuntu1~16.04

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://usn.ubuntu.com/4607-1
CVE-2020-14779, CVE-2020-14781, CVE-2020-14782, CVE-2020-14792,
CVE-2020-14796, CVE-2020-14797, CVE-2020-14798, CVE-2020-14803

Package Information:
  https://launchpad.net/ubuntu/+source/openjdk-8/8u272-b10-0ubuntu1~20.10
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.9+11-0ubuntu1
  https://launchpad.net/ubuntu/+source/openjdk-8/8u272-b10-0ubuntu1~20.04
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.9+11-0ubuntu1~20.04
  https://launchpad.net/ubuntu/+source/openjdk-8/8u272-b10-0ubuntu1~18.04
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.9+11-0ubuntu1~18.04.1
  https://launchpad.net/ubuntu/+source/openjdk-8/8u272-b10-0ubuntu1~16.04