The Basic authentication code in WEBrick library in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.
www.securityfocus.com/bid/100853
www.securitytracker.com/id/1039363
www.securitytracker.com/id/1042004
access.redhat.com/errata/RHSA-2017:3485
access.redhat.com/errata/RHSA-2018:0378
access.redhat.com/errata/RHSA-2018:0583
access.redhat.com/errata/RHSA-2018:0585
lists.debian.org/debian-lts-announce/2018/07/msg00012.html
security.gentoo.org/glsa/201710-18
usn.ubuntu.com/3528-1/
usn.ubuntu.com/3685-1/
www.debian.org/security/2017/dsa-4031
www.ruby-lang.org/en/news/2017/09/14/ruby-2-2-8-released/
www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released/
www.ruby-lang.org/en/news/2017/09/14/webrick-basic-auth-escape-sequence-injection-cve-2017-10784/