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    Ubuntu 4522-1: noVNC vulnerability

    Date
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    noVNC could be made to execute arbitrary code.
    ==========================================================================
    Ubuntu Security Notice USN-4522-1
    September 21, 2020
    
    novnc vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    noVNC could be made to execute arbitrary code.
    
    Software Description:
    - novnc: HTML5 VNC client - daemon and programs
    
    Details:
    
    It was discovered that noVNC did not properly manage certain messages,
    resulting in the remote VNC server injecting arbitrary HTML into the
    noVNC web page. An attacker could use this issue to conduct cross-site
    scripting (XSS) attacks. (CVE-2017-18635)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      novnc
    1:0.4+dfsg+1+20131010+gitf68af8af3d-4+deb8u1build0.16.04.1
      python-novnc
    1:0.4+dfsg+1+20131010+gitf68af8af3d-4+deb8u1build0.16.04.1
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4522-1
      CVE-2017-18635
    
    Package Information:
    
    https://launchpad.net/ubuntu/+source/novnc/1:0.4+dfsg+1+20131010+gitf68af8af3d-4+deb8u1build0.16.04.1
    
    

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