ESB-2020.2670 – [Ubuntu] Tomcat: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2670
                    USN-4448-1: Tomcat vulnerabilities
                               5 August 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Tomcat
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account      
                   Denial of Service               -- Remote/Unauthenticated
                   Reduced Security                -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-13935 CVE-2020-9484 CVE-2020-1935

Reference:         ESB-2020.2666
                   ESB-2020.2665

Original Bulletin: 
   https://usn.ubuntu.com/4448-1/

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USN-4448-1: Tomcat vulnerabilities
04 August 2020

Several security issues were fixed in Tomcat.
Releases

  o Ubuntu 16.04 LTS

Packages

  o 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

  o libtomcat8-java - 8.0.32-1ubuntu1.13
  o tomcat8 - 8.0.32-1ubuntu1.13

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

References

  o CVE-2020-13935
  o CVE-2020-1935
  o CVE-2020-9484

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