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USN-4596-1: Tomcat vulnerabilities

21 October 2020

Several security issues were fixed in Tomcat.

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Releases

Packages

  • tomcat9 - Apache Tomcat 9 - Servlet and JSP engine

Details

It was discovered that Tomcat did not properly manage HTTP/2 streams. An
attacker could possibly use this to cause Tomcat to consume resources,
resulting in a denial of service. (CVE-2020-11996)

It was discovered that Tomcat did not properly release the HTTP/1.1
processor after the upgrade to HTTP/2. An attacker could possibly use this
to generate an OutOfMemoryException, resulting in a denial of service.
(CVE-2020-13934)

It was discovered that Tomcat did not properly validate the payload length
in a WebSocket frame. An attacker could possibly use this to trigger an
infinite loop, resulting in a denial of service. (CVE-2020-13935)

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)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 20.04

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

References

Related notices

  • USN-4448-1: libservlet3.1-java-doc, tomcat8-docs, tomcat8-user, tomcat8-examples, tomcat8-common, libtomcat8-java, tomcat8-admin, tomcat8, libservlet3.1-java
  • USN-5360-1: tomcat9-user, libtomcat9-embed-java, tomcat9-admin, tomcat9, libtomcat9-java, tomcat9-docs, tomcat9-common, tomcat9-examples
  • USN-6908-1: tomcat7, tomcat7-docs, tomcat7-examples, tomcat7-user, libtomcat7-java, libservlet3.0-java-doc, tomcat7-admin, tomcat7-common, libservlet3.0-java
  • USN-6943-1: tomcat9-user, libservlet3.1-java-doc, tomcat8-docs, tomcat8-user, libtomcat9-embed-java, tomcat8-examples, tomcat8-common, libtomcat8-java, libtomcat9-java, tomcat9, libtomcat8-embed-java, tomcat9-admin, tomcat9-docs, tomcat9-common, tomcat8-admin, tomcat9-examples, tomcat8, libservlet3.1-java

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Further reading