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    ArchLinux: 202006-16: tomcat8: denial of service

    Date
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    The package tomcat8 before version 8.5.56-1 is vulnerable to denial of service.
    Arch Linux Security Advisory ASA-202006-16
    ==========================================
    
    Severity: Medium
    Date    : 2020-06-28
    CVE-ID  : CVE-2020-11996
    Package : tomcat8
    Type    : denial of service
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1197
    
    Summary
    =======
    
    The package tomcat8 before version 8.5.56-1 is vulnerable to denial of
    service.
    
    Resolution
    ==========
    
    Upgrade to 8.5.56-1.
    
    # pacman -Syu "tomcat8>=8.5.56-1"
    
    The problem has been fixed upstream in version 8.5.56.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    A denial of service has been found in Apache Tomcat before 9.0.36 and
    8.5.56, where a specially crafted sequence of HTTP/2 requests could
    trigger high CPU usage for several seconds. If a sufficient number of
    such requests were made on concurrent HTTP/2 connections, the server
    could become unresponsive.
    
    Impact
    ======
    
    A remote attacker might be able to cause a denial of service via a
    specially crafted sequence of HTTP/2 requests.
    
    References
    ==========
    
    https://www.openwall.com/lists/oss-security/2020/06/25/6
    https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.36
    https://github.com/apache/tomcat/commit/9a0231683a77e2957cea0fdee88b193b30b0c976
    https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.56
    https://github.com/apache/tomcat/commit/c8acd2ab7371e39aeca7c306f3b5380f00afe552
    https://security.archlinux.org/CVE-2020-11996
    

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