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    Ubuntu 4353-2: Firefox regression

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    USN-4353-1 caused a regression in Firefox.
    Ubuntu Security Notice USN-4353-2
    May 12, 2020
    firefox regression
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 20.04 LTS
    - Ubuntu 19.10
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    USN-4353-1 caused a regression in Firefox.
    Software Description:
    - firefox: Mozilla Open Source web browser
    USN-4353-1 fixed vulnerabilities in Firefox. The update caused a
    regression that impaired the functionality of some addons. This update
    fixes the problem.
    We apologize for the inconvenience.
    Original advisory details:
     Multiple security issues were discovered in Firefox. If a user were
     tricked in to opening a specially crafted website, an attacker could
     potentially exploit these to cause a denial of service, bypass security
     restrictions, spoof the URL bar, or execute arbitrary code.
     (CVE-2020-6831, CVE-2020-12387, CVE-2020-12390, CVE-2020-12391,
     CVE-2020-12394, CVE-2020-12395, CVE-2020-12396)
      It was discovered that the Devtools’ ‘Copy as cURL’ feature did not
     properly HTTP POST data of a request. If a user were tricked in to using
     the ‘Copy as cURL’ feature to copy and paste a command with specially
     crafted data in to a terminal, an attacker could potentially exploit this
     to obtain sensitive information from local files.
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 20.04 LTS:
      firefox                         76.0.1+build1-0ubuntu0.20.04.1
    Ubuntu 19.10:
      firefox                         76.0.1+build1-0ubuntu0.19.10.1
    Ubuntu 18.04 LTS:
      firefox                         76.0.1+build1-0ubuntu0.18.04.1
    Ubuntu 16.04 LTS:
      firefox                         76.0.1+build1-0ubuntu0.16.04.1
    After a standard system update you need to restart Firefox to make
    all the necessary changes.
    Package Information:


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