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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3441
                    USN-4571-1: rack-cors vulnerability
                              6 October 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           rack-cors
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-18978  

Reference:         ESB-2020.3428
                   ESB-2020.0444
                   ESB-2020.0376

Original Bulletin: 
   https://usn.ubuntu.com/4571-1/

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USN-4571-1: rack-cors vulnerability
05 October 2020

rack-cors would allow unintended access to files over the network.
Releases

  o Ubuntu 16.04 LTS

Packages

  o 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

  o ruby-rack-cors - 0.4.0-1+deb9u2build0.16.04.1

In general, a standard system update will make all the necessary changes.

References

  o CVE-2019-18978

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