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AUSCERT External Security Bulletin Redistribution
USN-4083-1: OpenJDK 11 vulnerabilities
1 August 2019
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Modify Arbitrary Files -- Remote with User Interaction
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote with User Interaction
CVE Names: CVE-2019-7317 CVE-2019-2821 CVE-2019-2818
CVE-2019-2816 CVE-2019-2786 CVE-2019-2769
Revision History: August 1 2019: Operating system added.
August 1 2019: Initial Release
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USN-4083-1: OpenJDK 11 vulnerabilities
31 July 2019
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.04
o Ubuntu 18.04 LTS
Several security issues were fixed in OpenJDK 11.
o openjdk-lts - Open Source Java implementation
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.
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.
The problem can be corrected by updating your system to the following package
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
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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