ESB-2020.3418 – [Ubuntu] Gon gem: Cross-site scripting – Remote with user interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3418
                     USN-4560-1: Gon gem vulnerability
                              1 October 2020

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

Product:           Gon gem
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-25739  

Reference:         ESB-2020.3315

Original Bulletin: 
   https://usn.ubuntu.com/4560-1/

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USN-4560-1: Gon gem vulnerability
30 September 2020

Gon gem could be made to run programs if it received specially crafted network
traffic.
Releases

  o Ubuntu 18.04 LTS

Packages

  o ruby-gon - Ruby library to send data to JavaScript from a Ruby application

Details

It was discovered that Gon gem did not properly escape certain input. An
attacker could use this vulnerability to execute a cross-site scripting
(XSS) attack.

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 18.04

  o ruby-gon - 6.1.0-1+deb9u1build0.18.04.1

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

References

  o CVE-2020-25739

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