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Ubuntu Security Notice USN-4083-1
July 31, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in OpenJDK 11.

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

Details:

It was discovered that OpenJDK did not sufficiently validate serial streams
before deserializing suppressed exceptions in some situations. An attacker
could use this to specially craft an object that, when deserialized, would
cause a denial of service. (CVE-2019-2762)

It was discovered that in some situations OpenJDK did not properly bound
the amount of memory allocated during object deserialization. An attacker
could use this to specially craft an object that, when deserialized, would
cause a denial of service (excessive memory consumption). (CVE-2019-2769)

It was discovered that OpenJDK did not properly restrict privileges in
certain situations. An attacker could use this to specially construct an
untrusted Java application or applet that could escape sandbox
restrictions. (CVE-2019-2786)

Jonathan Birch discovered that the Networking component of OpenJDK did not
properly validate URLs in some situations. An attacker could use this to
bypass restrictions on characters in URLs. (CVE-2019-2816)

It was discovered that the ChaCha20Cipher implementation in OpenJDK did not
use constant time computations in some situations. An attacker could use
this to expose sensitive information. (CVE-2019-2818)

It was discovered that the Java Secure Socket Extension (JSSE) component in
OpenJDK did not properly handle OCSP stapling messages during TLS handshake
in some situations. An attacker could use this to expose sensitive
information. (CVE-2019-2821)

It was discovered that OpenJDK incorrectly handled certain memory
operations. If a user or automated system were tricked into opening a
specially crafted PNG file, a remote attacker could use this issue to
cause OpenJDK to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2019-7317)

Update instructions:

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

Ubuntu 19.04:
  openjdk-11-jdk                  11.0.4+11-1ubuntu2~19.04
  openjdk-11-jdk-headless         11.0.4+11-1ubuntu2~19.04
  openjdk-11-jre                  11.0.4+11-1ubuntu2~19.04
  openjdk-11-jre-headless         11.0.4+11-1ubuntu2~19.04
  openjdk-11-jre-zero             11.0.4+11-1ubuntu2~19.04

Ubuntu 18.04 LTS:
  openjdk-11-jdk                  11.0.4+11-1ubuntu2~18.04.3
  openjdk-11-jdk-headless         11.0.4+11-1ubuntu2~18.04.3
  openjdk-11-jre                  11.0.4+11-1ubuntu2~18.04.3
  openjdk-11-jre-headless         11.0.4+11-1ubuntu2~18.04.3
  openjdk-11-jre-zero             11.0.4+11-1ubuntu2~18.04.3

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/4083-1
  CVE-2019-2762, CVE-2019-2769, CVE-2019-2786, CVE-2019-2816,
  CVE-2019-2818, CVE-2019-2821, CVE-2019-7317

Package Information:
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.4+11-1ubuntu2~19.04
  https://launchpad.net/ubuntu/+source/openjdk-lts/11.0.4+11-1ubuntu2~18.04.3