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AUSCERT External Security Bulletin Redistribution
USN-4257-1: OpenJDK vulnerabilities
29 January 2020
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2020-2659 CVE-2020-2655 CVE-2020-2654
CVE-2020-2604 CVE-2020-2601 CVE-2020-2593
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USN-4257-1: OpenJDK vulnerabilities
28 January 2020
openjdk-8, openjdk-lts vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Several security issues were fixed in OpenJDK.
o openjdk-8 - Open Source Java implementation
o openjdk-lts - Open Source Java implementation
It was discovered that OpenJDK incorrectly handled exceptions during
deserialization in BeanContextSupport. An attacker could possibly use this
issue to cause a denial of service or other unspecified impact. (CVE-2020-2583)
It was discovered that OpenJDK incorrectly validated properties of SASL
messages included in Kerberos GSSAPI. An unauthenticated remote attacker with
network access via Kerberos could possibly use this issue to insert, modify or
obtain sensitive information. (CVE-2020-2590)
It was discovered that OpenJDK incorrectly validated URLs. An attacker could
possibly use this issue to insert, edit or obtain sensitive information.
It was discovered that OpenJDK Security component still used MD5 algorithm. A
remote attacker could possibly use this issue to obtain sensitive information.
It was discovered that OpenJDK incorrectly handled the application of
serialization filters. An attacker could possibly use this issue to bypass the
intended filter during serialization. (CVE-2020-2604)
Bo Zhang and Long Kuan discovered that OpenJDK incorrectly handled X.509
certificates. An attacker could possibly use this issue to cause a denial of
Bengt Jonsson, Juraj Somorovsky, Kostis Sagonas, Paul Fiterau Brostean and
Robert Merget discovered that OpenJDK incorrectly handled CertificateVerify TLS
handshake messages. A remote attacker could possibly use this issue to insert,
edit or obtain sensitive information. This issue only affected OpenJDK 11.
It was discovered that OpenJDK incorrectly enforced the limit of datagram
sockets that can be created by a code running within a Java sandbox. An
attacker could possibly use this issue to bypass the sandbox restrictions
causing a denial of service. This issue only affected OpenJDK 8.
The problem can be corrected by updating your system to the following package
openjdk-11-jdk - 11.0.6+10-1ubuntu1~19.10.1
openjdk-11-jre - 11.0.6+10-1ubuntu1~19.10.1
openjdk-11-jre-headless - 11.0.6+10-1ubuntu1~19.10.1
openjdk-11-jre-zero - 11.0.6+10-1ubuntu1~19.10.1
openjdk-8-jdk - 8u242-b08-0ubuntu3~19.10
openjdk-8-jre - 8u242-b08-0ubuntu3~19.10
openjdk-8-jre-headless - 8u242-b08-0ubuntu3~19.10
openjdk-8-jre-zero - 8u242-b08-0ubuntu3~19.10
Ubuntu 18.04 LTS
openjdk-11-jdk - 11.0.6+10-1ubuntu1~18.04.1
openjdk-11-jre - 11.0.6+10-1ubuntu1~18.04.1
openjdk-11-jre-headless - 11.0.6+10-1ubuntu1~18.04.1
openjdk-11-jre-zero - 11.0.6+10-1ubuntu1~18.04.1
openjdk-8-jdk - 8u242-b08-0ubuntu3~18.04
openjdk-8-jre - 8u242-b08-0ubuntu3~18.04
openjdk-8-jre-headless - 8u242-b08-0ubuntu3~18.04
openjdk-8-jre-zero - 8u242-b08-0ubuntu3~18.04
Ubuntu 16.04 LTS
openjdk-8-jdk - 8u242-b08-0ubuntu3~16.04
openjdk-8-jre - 8u242-b08-0ubuntu3~16.04
openjdk-8-jre-headless - 8u242-b08-0ubuntu3~16.04
openjdk-8-jre-jamvm - 8u242-b08-0ubuntu3~16.04
openjdk-8-jre-zero - 8u242-b08-0ubuntu3~16.04
To update your system, please follow these instructions: https://
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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