A ruby-actionpack-page-caching security update has been released for Debian GNU/Linux 9 LTS to address an issue that allowed an attacker to write arbitrary files.

DLA 2719-1: ruby-actionpack-page-caching security update

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Debian LTS Advisory DLA-2719-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
July 23, 2021   https://wiki.debian.org/LTS
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Package : ruby-actionpack-page-caching
Version : 1.0.2-4+deb9u1
CVE ID : CVE-2020-8159
Debian Bug : 960680

ooooooo_q discovered that the actionpack_page-caching Ruby gem, a
static page caching module for Rails, allows an attacker to write
arbitrary files to a web server, potentially resulting in remote code
execution if the attacker can write unescaped ERB to a view.

For Debian 9 stretch, this problem has been fixed in version
1.0.2-4+deb9u1.

We recommend that you upgrade your ruby-actionpack-page-caching packages.

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

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