Ubuntu 3758-2: libx11 vulnerabilities

    Date 30 Aug 2018
    3020
    Posted By Anthony Pell
    Several security issues were fixed in libx11.
    ==========================================================================
    Ubuntu Security Notice USN-3758-2
    August 30, 2018
    
    libx11 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in libx11.
    
    Software Description:
    - libx11: X11 client-side library
    
    Details:
    
    USN-3758-1 fixed several vulnerabilities in libx11. This update
    provides the corresponding update for Ubuntu 12.04 ESM.
    
    Original advisory details:
    
     Tobias Stoeckmann discovered that libx11 incorrectly handled certain
     images. An attacker could possibly use this issue to access sensitive
     information (CVE-2016-7942)
    
     Tobias Stoeckmann discovered that libx11 incorrectly handled certain
     inputs. An attacker could possibly use this issue to access sensitive
     information. (CVE-2016-7943)
    
     It was discovered that libx11 incorrectly handled certain inputs.
     An attacker could possibly use this issue to cause a denial of
     service. (CVE-2018-14598, CVE-2018-14599, CVE-2018-14600)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      libx11-6                        2:1.4.99.1-0ubuntu2.4
      libx11-dev                      2:1.4.99.1-0ubuntu2.4
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      https://usn.ubuntu.com/usn/usn-3758-2
      https://usn.ubuntu.com/usn/usn-3758-1
      CVE-2016-7942, CVE-2016-7943, CVE-2018-14598, CVE-2018-14599,
      CVE-2018-14600
    

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