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AUSCERT External Security Bulletin Redistribution
ESB-2021.1429
USN-4892-1: OpenJDK vulnerability
28 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: OpenJDK
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Modify Arbitrary Files -- Remote with User Interaction
Create Arbitrary Files -- Remote with User Interaction
Delete Arbitrary Files -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-2163
Reference: ASB-2021.0076
ESB-2021.1414
ESB-2021.1394
Original Bulletin:
https://ubuntu.com/security/notices/USN-4892-1
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USN-4892-1: OpenJDK vulnerability
27 April 2021
OpenJDK's security restriction could be bypassed when verifying Jar
signatures.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o openjdk-8 - Open Source Java implementation
o openjdk-lts - Open Source Java implementation
Details
It was discovered that OpenJDK incorrectly verified Jar signatures. An
attacker could possibly use this issue to bypass intended security
restrictions when using Jar files signed with a disabled algorithm.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o openjdk-8-jdk - 8u292-b10-0ubuntu1~20.10
o openjdk-8-jre-headless - 8u292-b10-0ubuntu1~20.10
o openjdk-11-jre-zero - 11.0.11+9-0ubuntu2~20.10
o openjdk-8-jre - 8u292-b10-0ubuntu1~20.10
o openjdk-11-jre-headless - 11.0.11+9-0ubuntu2~20.10
o openjdk-11-jdk - 11.0.11+9-0ubuntu2~20.10
o openjdk-8-jre-zero - 8u292-b10-0ubuntu1~20.10
o openjdk-11-jre - 11.0.11+9-0ubuntu2~20.10
Ubuntu 20.04
o openjdk-8-jdk - 8u292-b10-0ubuntu1~20.04
o openjdk-8-jre-headless - 8u292-b10-0ubuntu1~20.04
o openjdk-11-jre-zero - 11.0.11+9-0ubuntu2~20.04
o openjdk-8-jre - 8u292-b10-0ubuntu1~20.04
o openjdk-11-jre-headless - 11.0.11+9-0ubuntu2~20.04
o openjdk-11-jdk - 11.0.11+9-0ubuntu2~20.04
o openjdk-8-jre-zero - 8u292-b10-0ubuntu1~20.04
o openjdk-11-jre - 11.0.11+9-0ubuntu2~20.04
Ubuntu 18.04
o openjdk-8-jdk - 8u292-b10-0ubuntu1~18.04
o openjdk-8-jre-headless - 8u292-b10-0ubuntu1~18.04
o openjdk-11-jre-zero - 11.0.11+9-0ubuntu2~18.04
o openjdk-8-jre - 8u292-b10-0ubuntu1~18.04
o openjdk-11-jre-headless - 11.0.11+9-0ubuntu2~18.04
o openjdk-11-jdk - 11.0.11+9-0ubuntu2~18.04
o openjdk-8-jre-zero - 8u292-b10-0ubuntu1~18.04
o openjdk-11-jre - 11.0.11+9-0ubuntu2~18.04
Ubuntu 16.04
o openjdk-8-jre-zero - 8u292-b10-0ubuntu1~16.04.1
o openjdk-8-jdk - 8u292-b10-0ubuntu1~16.04.1
o openjdk-8-jre-headless - 8u292-b10-0ubuntu1~16.04.1
o openjdk-8-jre - 8u292-b10-0ubuntu1~16.04.1
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.
References
o CVE-2021-2163
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