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Ubuntu 20.04 LTS: USN-4596-1 Moderate: Tomcat Denial of Service

ubuntu
Calendar Grey October 21, 2020
Dist Ubuntu Esm H88
Several security flaws in Tomcat highlighted in Ubuntu security advisory USN-4596-1, affecting operational stability.
Several security issues were fixed in Tomcat.

Summary

Several security issues were fixed in Tomcat.

Software Description:

- 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)

Topics%20covered

Topics Covered

security advisory denial of service code execution Ubuntu tomcat out of memory http stream

Update Instructions

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

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

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

References

https://ubuntu.com/security/notices/USN-4596-1

CVE-2020-11996, CVE-2020-13934, CVE-2020-13935, CVE-2020-9484

October 21, 2020

Topics%20covered

Topics Covered

security advisory denial of service code execution Ubuntu tomcat out of memory http stream

Package Information

https://launchpad.net/ubuntu/+source/tomcat9/9.0.31-1ubuntu0.1

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