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    Ubuntu 4448-1: Tomcat vulnerabilities

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    Several security issues were fixed in Tomcat.
    ==========================================================================
    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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