Linux Security
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    Linux Security

    Ubuntu 4246-1: zlib vulnerabilities

    Date 22 Jan 2020
    397
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in zlib
    ==========================================================================
    Ubuntu Security Notice USN-4246-1
    January 22, 2020
    
    zlib vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in zlib
    
    Software Description:
    - zlib: Lossless data-compression library
    
    Details:
    
    It was discovered that zlib incorrectly handled pointer arithmetic. An
    attacker
    could use this issue to cause zlib to crash, resulting in a denial of
    service, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)
    
    It was discovered that zlib incorrectly handled vectors involving left
    shifts of
    negative integers. An attacker could use this issue to cause zlib to
    crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2016-9842)
    
    It was discovered that zlib incorrectly handled vectors involving
    big-endian CRC
    calculation. An attacker could use this issue to cause zlib to crash,
    resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2016-9843)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
    lib32z1 1:1.2.8.dfsg-2ubuntu4.3
    lib64z1 1:1.2.8.dfsg-2ubuntu4.3
    libn32z1 1:1.2.8.dfsg-2ubuntu4.3
    libx32z1 1:1.2.8.dfsg-2ubuntu4.3
    zlib1g 1:1.2.8.dfsg-2ubuntu4.3
    
    In general, a standard system update will make all the necessary changes.
    
    References:
    https://usn.ubuntu.com/4246-1
    CVE-2016-9840, CVE-2016-9841, CVE-2016-9842, CVE-2016-9843
    
    Package Information:
    https://launchpad.net/ubuntu/+source/zlib/1:1.2.8.dfsg-2ubuntu4.3
    
    
    
    

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