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AUSCERT External Security Bulletin Redistribution
USN-4433-1: OpenJDK vulnerabilities
24 July 2020
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
CVE Names: CVE-2020-14621 CVE-2020-14593 CVE-2020-14583
CVE-2020-14581 CVE-2020-14577 CVE-2020-14573
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USN-4433-1: OpenJDK vulnerabilities
23 July 2020
Several security issues were fixed in OpenJDK.
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o openjdk-lts - Open Source Java implementation
Johannes Kuhn discovered that OpenJDK incorrectly handled access control
contexts. An attacker could possibly use this issue to execute arbitrary
It was discovered that OpenJDK incorrectly handled memory allocation when
reading TIFF image files. An attacker could possibly use this issue to
cause a denial of service. (CVE-2020-14562)
It was discovered that OpenJDK incorrectly handled input data. An
attacker could possibly use this issue to insert, edit or obtain
sensitive information. (CVE-2020-14573)
Philippe Arteau discovered that OpenJDK incorrectly verified names in
TLS server's X.509 certificates. An attacker could possibly use this
issue to obtain sensitive information. (CVE-2020-14577)
It was discovered that OpenJDK incorrectly handled image files. An
attacker could possibly use this issue to obtain sensitive information.
Markus Loewe discovered that OpenJDK incorrectly handled concurrent
access in java.nio.Buffer class. An attacker could use this issue to
bypass the sandbox restrictions and cause unspecified impact.
It was discovered that OpenJDK incorrectly handled transformation of
images. An attacker could possibly use this issue to bypass sandbox
restrictions and insert, edit or obtain sensitive information.
Roman Shemyakin discovered that OpenJDK incorrectly handled XML files.
An attacker could possibly use this issue to insert, edit or obtain
sensitive information. (CVE-2020-14621)
The problem can be corrected by updating your system to the following package
o openjdk-11-jdk - 11.0.8+10-0ubuntu1~20.04
o openjdk-11-jre - 11.0.8+10-0ubuntu1~20.04
o openjdk-11-jre-headless - 11.0.8+10-0ubuntu1~20.04
o openjdk-11-jre-zero - 11.0.8+10-0ubuntu1~20.04
o openjdk-11-jdk - 11.0.8+10-0ubuntu1~18.04.1
o openjdk-11-jre - 11.0.8+10-0ubuntu1~18.04.1
o openjdk-11-jre-headless - 11.0.8+10-0ubuntu1~18.04.1
o openjdk-11-jre-zero - 11.0.8+10-0ubuntu1~18.04.1
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.
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