A Tomcat security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

USN-5360-1: Tomcat vulnerabilities

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Ubuntu Security Notice USN-5360-1
March 31, 2022

tomcat9 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Tomcat.

Software Description:
- tomcat9: Apache Tomcat 9 - Servlet and JSP engine

Details:

It was discovered that Tomcat incorrectly performed input verification.
A remote attacker could possibly use this issue to intercept sensitive
information. (CVE-2020-13943, CVE-2020-17527, CVE-2021-25122, CVE-2021-30640)

It was discovered that Tomcat did not properly deserialize untrusted data.
An attacker could possibly use this issue to execute arbitrary code.
(CVE-2020-9484, CVE-2021-33037)

It was discovered that Tomcat did not properly validate the input length. An
attacker could possibly use this to trigger an infinite loop, resulting in a
denial of service. (CVE-2020-9494, CVE-2021-25329, CVE-2021-41079)

Update instructions:

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

Ubuntu 20.04 LTS:
libtomcat9-embed-java 9.0.31-1ubuntu0.2
libtomcat9-java 9.0.31-1ubuntu0.2
tomcat9 9.0.31-1ubuntu0.2
tomcat9-common 9.0.31-1ubuntu0.2

Ubuntu 18.04 LTS:
libtomcat9-embed-java 9.0.16-3ubuntu0.18.04.2
libtomcat9-java 9.0.16-3ubuntu0.18.04.2
tomcat9 9.0.16-3ubuntu0.18.04.2
tomcat9-common 9.0.16-3ubuntu0.18.04.2

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5360-1
CVE-2020-13943, CVE-2020-17527, CVE-2020-9484, CVE-2020-9494,
CVE-2021-25122, CVE-2021-25329, CVE-2021-30640, CVE-2021-33037,
CVE-2021-41079,   https://bugs.launchpad.net/ubuntu/+source/tomcat9/+bug/1915911

Package Information:
  https://launchpad.net/ubuntu/+source/tomcat9/9.0.31-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/tomcat9/9.0.16-3ubuntu0.18.04.2