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Ubuntu Security Notice USN-4448-1

Ubuntu Security Notice USN-4448-1
Posted Aug 5, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4448-1 - It was discovered that Tomcat incorrectly validated the payload length in a WebSocket frame. A remote attacker could possibly use this issue to cause Tomcat to hang, resulting in a denial of service. It was discovered that Tomcat incorrectly handled HTTP header parsing. In certain environments where Tomcat is located behind a reverse proxy, a remote attacker could possibly use this issue to perform HTTP Request Smuggling. Various other issues were also addressed.

tags | advisory, remote, web, denial of service
systems | linux, ubuntu
advisories | CVE-2020-13935, CVE-2020-1935, CVE-2020-9484
SHA-256 | 724049f922fdcaed76bab946a48ccfcb9b0e1d275e3effd77f8cf41f47d39f4a

Ubuntu Security Notice USN-4448-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4448-1
August 04, 2020

tomcat8 vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Tomcat.

Software Description:
- tomcat8: Servlet and JSP engine

Details:

It was discovered that Tomcat incorrectly validated the payload length in
a WebSocket frame. A remote attacker could possibly use this issue to cause
Tomcat to hang, resulting in a denial of service. (CVE-2020-13935)

It was discovered that Tomcat incorrectly handled HTTP header parsing. In
certain environments where Tomcat is located behind a reverse proxy, a
remote attacker could possibly use this issue to perform HTTP Reqest
Smuggling. (CVE-2020-1935)

It was discovered that Tomcat incorrectly handled certain uncommon
PersistenceManager with FileStore configurations. A remote attacker could
possibly use this issue to execute arbitrary code. (CVE-2020-9484)

Update instructions:

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

Ubuntu 16.04 LTS:
libtomcat8-java 8.0.32-1ubuntu1.13
tomcat8 8.0.32-1ubuntu1.13

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

References:
https://usn.ubuntu.com/4448-1
CVE-2020-13935, CVE-2020-1935, CVE-2020-9484

Package Information:
https://launchpad.net/ubuntu/+source/tomcat8/8.0.32-1ubuntu1.13
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