Linux Security
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    Ubuntu 4571-1: rack-cors vulnerability

    Date 05 Oct 2020
    102
    Posted By LinuxSecurity Advisories
    rack-cors would allow unintended access to files over the network.
    ==========================================================================
    Ubuntu Security Notice USN-4571-1
    October 05, 2020
    
    ruby-rack-cors vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    rack-cors would allow unintended access to files over the network.
    
    Software Description:
    - ruby-rack-cors: provides support for Cross-Origin Resource Sharing (CORS) for
    Rack compatible web applications
    
    Details:
    
    It was discovered that rack-cors did not properly handle relative file
    paths. An attacker could use this vulnerability to access arbitrary files.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      ruby-rack-cors                  0.4.0-1+deb9u2build0.16.04.1
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4571-1
      CVE-2019-18978
    
    Package Information:
      https://launchpad.net/ubuntu/+source/ruby-rack-cors/0.4.0-1+deb9u2build0.16.04.1
    
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