Linux Security
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    Ubuntu 4616-1: AccountsService vulnerabilities

    Date 03 Nov 2020
    388
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in AccountsService.
    ==========================================================================
    Ubuntu Security Notice USN-4616-1
    November 03, 2020
    
    accountsservice vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 20.10
    - Ubuntu 20.04 LTS
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in AccountsService.
    
    Software Description:
    - accountsservice: query and manipulate user account information
    
    Details:
    
    Kevin Backhouse discovered that AccountsService incorrectly dropped
    privileges. A local user could possibly use this issue to cause
    AccountsService to crash or hang, resulting in a denial of service.
    (CVE-2020-16126)
    
    Kevin Backhouse discovered that AccountsService incorrectly handled reading
    .pam_environment files. A local user could possibly use this issue to cause
    AccountsService to crash or hang, resulting in a denial of service. This
    issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2020-16127)
    
    Matthias Gerstner discovered that AccountsService incorrectly handled
    certain path checks. A local attacker could possibly use this issue to
    read arbitrary files. This issue only affected Ubuntu 16.04 LTS and Ubuntu
    18.04 LTS. (CVE-2018-14036)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.10:
      accountsservice                 0.6.55-0ubuntu13.2
      libaccountsservice0             0.6.55-0ubuntu13.2
    
    Ubuntu 20.04 LTS:
      accountsservice                 0.6.55-0ubuntu12~20.04.4
      libaccountsservice0             0.6.55-0ubuntu12~20.04.4
    
    Ubuntu 18.04 LTS:
      accountsservice                 0.6.45-1ubuntu1.3
      libaccountsservice0             0.6.45-1ubuntu1.3
    
    Ubuntu 16.04 LTS:
      accountsservice                 0.6.40-2ubuntu11.6
      libaccountsservice0             0.6.40-2ubuntu11.6
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4616-1
      CVE-2018-14036, CVE-2020-16126, CVE-2020-16127
    
    Package Information:
      https://launchpad.net/ubuntu/+source/accountsservice/0.6.55-0ubuntu13.2
      https://launchpad.net/ubuntu/+source/accountsservice/0.6.55-0ubuntu12~20.04.4
      https://launchpad.net/ubuntu/+source/accountsservice/0.6.45-1ubuntu1.3
      https://launchpad.net/ubuntu/+source/accountsservice/0.6.40-2ubuntu11.6
    
    

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