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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1410
                      USN-4922-2: Ruby vulnerability
                               27 April 2021

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

Product:           ruby2.7
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Create Arbitrary Files -- Remote with User Interaction
                   Reduced Security       -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-28965  

Reference:         ESB-2021.1347
                   ESB-2021.1334

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4922-2

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USN-4922-2: Ruby vulnerability
26 April 2021

Ruby incorrectly handled XML documents.
Releases

  o Ubuntu 21.04

Packages

  o ruby2.7 - Object-oriented scripting language

Details

USN-4922-1 fixed a vulnerability in Ruby. This update provides the
corresponding update for Ubuntu 21.04.

Original advisory details:

Juho Nurminen discovered that the REXML gem bundled with Ruby incorrectly
parsed and serialized XML documents. A remote attacker could possibly use
this issue to perform an XML round-trip attack.

Update instructions

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

Ubuntu 21.04

  o ruby2.7 - 2.7.2-4ubuntu1.1
  o libruby2.7 - 2.7.2-4ubuntu1.1

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

References

  o CVE-2021-28965

Related notices

  o USN-4922-1 : ruby2.3, libruby2.5, libruby2.7, libruby2.3, ruby2.7, ruby2.5

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