A rails security update has been released for Debian GNU/Linux 8 LTS to address two vulnerabilities in Ruby on Rails.

DLA 2251-1: rails security update

Package : rails
Version : 2:4.1.8-1+deb8u7
CVE ID : CVE-2020-8164 CVE-2020-8165

Two 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-2020-8164

Strong parameters bypass vector in ActionPack. In some cases user
supplied information can be inadvertently leaked from Strong
Parameters. Specifically the return value of `each`, or
`each_value`, or `each_pair` will return the underlying
"untrusted" hash of data that was read from the parameters.
Applications that use this return value may be inadvertently use
untrusted user input.

CVE-2020-8165

Potentially unintended unmarshalling of user-provided objects in
MemCacheStore. There is potentially unexpected behaviour in the
MemCacheStore where, when untrusted user input is written to the
cache store using the `raw: true` parameter, re-reading the result
from the cache can evaluate the user input as a Marshalled object
instead of plain text. Unmarshalling of untrusted user input can
have impact up to and including RCE. At a minimum, this
vulnerability allows an attacker to inject untrusted Ruby objects
into a web application.

In addition to upgrading to the latest versions of Rails,
developers should ensure that whenever they are calling
`Rails.cache.fetch` they are using consistent values of the `raw`
parameter for both reading and writing.

For Debian 8 "Jessie", these problems have been fixed in version
2:4.1.8-1+deb8u7.

We recommend that you upgrade your rails packages.

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