A rails security update has been released for Debian GNU/Linux 9 LTS to address multiple vulnerabilities in Ruby on Rails.

DLA 2282-1: rails security update

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Debian LTS Advisory DLA-2282-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/
July 20, 2020   https://wiki.debian.org/LTS
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Package : rails
Version : 2:4.2.7.1-1+deb9u3
CVE ID : CVE-2020-8163 CVE-2020-8164 CVE-2020-8165

Multiple vulnerabilities were found in Ruby on Rails, a MVC ruby-based
framework geared for web application development, which could lead to
remote code execution and untrusted user input usage, depending on the
application.

CVE-2020-8163

A code injection vulnerability in Rails would allow an attacker
who controlled the `locals` argument of a `render` call to perform
a RCE.

CVE-2020-8164

A deserialization of untrusted data vulnerability exists in rails
which can allow an attacker to supply information can be
inadvertently leaked from Strong Parameters.

CVE-2020-8165

A deserialization of untrusted data vulnernerability exists in
rails that can allow an attacker to unmarshal user-provided objects
in MemCacheStore and RedisCacheStore potentially resulting in an
RCE.

For Debian 9 stretch, these problems have been fixed in version
2:4.2.7.1-1+deb9u3.

We recommend that you upgrade your rails packages.

For the detailed security status of rails please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/rails

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS