New ruby packages are available for Slackware 14.2 and -current to fix a security issue.

Here are the details from the Slackware 14.2 ChangeLog:
+--------------------------+
patches/packages/ruby-2.2.9-i586-1_slack14.2.txz: Upgraded.
This update fixes a security issue:
Net::FTP#get, getbinaryfile, gettextfile, put, putbinaryfile, and puttextfile
use Kernel#open to open a local file. If the localfile argument starts with
the pipe character "|", the command following the pipe character is executed.
The default value of localfile is File.basename(remotefile), so malicious FTP
servers could cause arbitrary command execution.
For more information, see:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17405
(* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab
(http://osuosl.org) for donating FTP and rsync hosting
to the Slackware project!

Also see the "Get Slack" section on http://slackware.com for
additional mirror sites near you.

Updated package for Slackware 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware-14.2/patches/packages/ruby-2.2.9-i586-1_slack14.2.txz

Updated package for Slackware x86_64 14.2:
ftp://ftp.slackware.com/pub/slackware/slackware64-14.2/patches/packages/ruby-2.2.9-x86_64-1_slack14.2.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/d/ruby-2.4.3-i586-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/d/ruby-2.4.3-x86_64-1.txz


MD5 signatures:
+-------------+

Slackware 14.2 package:
095fdfa07170e4697d42fe43f3030b81 ruby-2.2.9-i586-1_slack14.2.txz

Slackware x86_64 14.2 package:
e124e967447b3565b0f9baa6e56bdd6b ruby-2.2.9-x86_64-1_slack14.2.txz

Slackware -current package:
f27cc750ef8b400998caf6cde04dc0c0 d/ruby-2.4.3-i586-1.txz

Slackware x86_64 -current package:
d7da38ad9540e469e6fb5710ed5a8b54 d/ruby-2.4.3-x86_64-1.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg ruby-2.2.9-i586-1_slack14.2.txz

  Ruby (SSA:2017-353-01) Update for Slackware