==========================================================================
Ubuntu Security Notice USN-6662-1
February 27, 2024

openjdk-21 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in OpenJDK 21.

Software Description:
- openjdk-21: Open Source Java implementation

Details:

Yi Yang discovered that the Hotspot component of OpenJDK 21 incorrectly
handled array accesses in the C1 compiler. An attacker could possibly
use this issue to cause a denial of service, execute arbitrary code or
bypass Java sandbox restrictions. (CVE-2024-20918)

It was discovered that the Hotspot component of OpenJDK 21 did not
properly verify bytecode in certain situations. An attacker could
possibly use this issue to bypass Java sandbox restrictions.
(CVE-2024-20919)

It was discovered that the Hotspot component of OpenJDK 21 had an
optimization flaw when generating range check loop predicates. An attacker
could possibly use this issue to cause a denial of service, execute
arbitrary code or bypass Java sandbox restrictions. (CVE-2024-20921)

It was discovered that OpenJDK 21 could produce debug logs that contained
private keys used for digital signatures. An attacker could possibly use
this issue to obtain sensitive information. (CVE-2024-20945)

Hubert Kario discovered that the TLS implementation in OpenJDK 21 had a
timing side-channel and incorrectly handled RSA padding. A remote attacker
could possibly use this issue to recover sensitive information.
(CVE-2024-20952)

Update instructions:

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

Ubuntu 23.10:
   openjdk-21-jdk                  21.0.2+13-1~23.10.1
   openjdk-21-jdk-headless         21.0.2+13-1~23.10.1
   openjdk-21-jre                  21.0.2+13-1~23.10.1
   openjdk-21-jre-headless         21.0.2+13-1~23.10.1
   openjdk-21-jre-zero             21.0.2+13-1~23.10.1

Ubuntu 22.04 LTS:
   openjdk-21-jdk                  21.0.2+13-1~22.04.1
   openjdk-21-jdk-headless         21.0.2+13-1~22.04.1
   openjdk-21-jre                  21.0.2+13-1~22.04.1
   openjdk-21-jre-headless         21.0.2+13-1~22.04.1
   openjdk-21-jre-zero             21.0.2+13-1~22.04.1

Ubuntu 20.04 LTS:
   openjdk-21-jdk                  21.0.2+13-1~20.04.1
   openjdk-21-jdk-headless         21.0.2+13-1~20.04.1
   openjdk-21-jre                  21.0.2+13-1~20.04.1
   openjdk-21-jre-headless         21.0.2+13-1~20.04.1
   openjdk-21-jre-zero             21.0.2+13-1~20.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any Java
applications to make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6662-1
   CVE-2024-20918, CVE-2024-20919, CVE-2024-20921, CVE-2024-20945,
   CVE-2024-20952

Package Information:
   https://launchpad.net/ubuntu/+source/openjdk-21/21.0.2+13-1~23.10.1
   https://launchpad.net/ubuntu/+source/openjdk-21/21.0.2+13-1~22.04.1
   https://launchpad.net/ubuntu/+source/openjdk-21/21.0.2+13-1~20.04.1