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    Ubuntu 4407-1: LibVNCServer vulnerabilities

    Date
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    Several security issues were fixed in LibVNCServer.
    ==========================================================================
    Ubuntu Security Notice USN-4407-1
    July 01, 2020
    
    libvncserver vulnerabilities
    ==========================================================================
    
    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
    
    Summary:
    
    Several security issues were fixed in LibVNCServer.
    
    Software Description:
    - libvncserver: vnc server library
    
    Details:
    
    It was discovered that LibVNCServer incorrectly handled decompressing
    data. An
    attacker could possibly use this issue to cause LibVNCServer to crash,
    resulting in a denial of service. (CVE-2019-15680)
    
    It was discovered that an information disclosure vulnerability existed in
    LibVNCServer when sending a ServerCutText message. An attacker could
    possibly
    use this issue to expose sensitive information. This issue only affected
    Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15681)
    
    It was discovered that LibVNCServer incorrectly handled cursor shape
    updates.
    If a user were tricked in to connecting to a malicious server, an attacker
    could possibly use this issue to cause LibVNCServer to crash, resulting in a
    denial of service, or possibly execute arbitrary code. This issue only
    affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS.
    (CVE-2019-15690, CVE-2019-20788)
    
    It was discovered that LibVNCServer incorrectly handled decoding WebSocket
    frames. An attacker could possibly use this issue to cause LibVNCServer to
    crash, resulting in a denial of service, or possibly execute arbitrary code.
    This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu
    16.04 LTS.
    (CVE-2017-18922)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.04 LTS:
    libvncclient1 0.9.12+dfsg-9ubuntu0.1
    libvncserver1 0.9.12+dfsg-9ubuntu0.1
    
    Ubuntu 19.10:
    libvncclient1 0.9.11+dfsg-1.3ubuntu0.1
    libvncserver1 0.9.11+dfsg-1.3ubuntu0.1
    
    Ubuntu 18.04 LTS:
    libvncclient1 0.9.11+dfsg-1ubuntu1.2
    libvncserver1 0.9.11+dfsg-1ubuntu1.2
    
    Ubuntu 16.04 LTS:
    libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.4
    libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.4
    
    After a standard system update you need to restart LibVNCServer to make
    all the necessary changes.
    
    References:
    https://usn.ubuntu.com/4407-1
    CVE-2017-18922, CVE-2019-15680, CVE-2019-15681, CVE-2019-15690,
    CVE-2019-20788
    
    Package Information:
    https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.1
    https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1.3ubuntu0.1
    https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.2
    https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.4
    
    
    

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