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    Ubuntu 4458-1: Apache HTTP Server vulnerabilities

    Date
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    Several security issues were fixed in Apache HTTP Server.
    ==========================================================================
    Ubuntu Security Notice USN-4458-1
    August 13, 2020
    
    apache2 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 20.04 LTS
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in Apache HTTP Server.
    
    Software Description:
    - apache2: Apache HTTP server
    
    Details:
    
    Fabrice Perez discovered that the Apache mod_rewrite module incorrectly
    handled certain redirects. A remote attacker could possibly use this issue
    to perform redirects to an unexpected URL. (CVE-2020-1927)
    
    Chamal De Silva discovered that the Apache mod_proxy_ftp module incorrectly
    handled memory when proxying to a malicious FTP server. A remote attacker
    could possibly use this issue to obtain sensitive information.
    (CVE-2020-1934)
    
    Felix Wilhelm discovered that the HTTP/2 implementation in Apache did not
    properly handle certain Cache-Digest headers. A remote attacker could
    possibly use this issue to cause Apache to crash, resulting in a denial of
    service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
    (CVE-2020-9490)
    
    Felix Wilhelm discovered that the Apache mod_proxy_uwsgi module incorrectly
    handled large headers. A remote attacker could use this issue to obtain
    sensitive information or possibly execute arbitrary code. This issue only
    affected Ubuntu 20.04 LTS. (CVE-2020-11984)
    
    Felix Wilhelm discovered that the HTTP/2 implementation in Apache did not
    properly handle certain logging statements. A remote attacker could
    possibly use this issue to cause Apache to crash, resulting in a denial of
    service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
    (CVE-2020-11993)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.04 LTS:
      apache2                         2.4.41-4ubuntu3.1
      apache2-bin                     2.4.41-4ubuntu3.1
      libapache2-mod-proxy-uwsgi      2.4.41-4ubuntu3.1
    
    Ubuntu 18.04 LTS:
      apache2                         2.4.29-1ubuntu4.14
      apache2-bin                     2.4.29-1ubuntu4.14
    
    Ubuntu 16.04 LTS:
      apache2                         2.4.18-2ubuntu3.17
      apache2-bin                     2.4.18-2ubuntu3.17
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4458-1
      CVE-2020-11984, CVE-2020-11993, CVE-2020-1927, CVE-2020-1934,
      CVE-2020-9490
    
    Package Information:
      https://launchpad.net/ubuntu/+source/apache2/2.4.41-4ubuntu3.1
      https://launchpad.net/ubuntu/+source/apache2/2.4.29-1ubuntu4.14
      https://launchpad.net/ubuntu/+source/apache2/2.4.18-2ubuntu3.17
    
    

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