Bash before 4.4 allows local users to execute arbitrary commands with root privileges via crafted SHELLOPTS and PS4 environment variables.
rhn.redhat.com/errata/RHSA-2017-0725.html
www.openwall.com/lists/oss-security/2016/09/26/9
www.securityfocus.com/bid/93183
www.securitytracker.com/id/1037812
access.redhat.com/errata/RHSA-2017:1931
h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05388115
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7XOQSHU63Y357NHU5FPTFBM6I3YOCQB/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OU3C756YPHDAAPFX76UGZBAQQQ5UMHS5/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2VRBSIPZDZ75ZQ2DLITHUIDW4W26KVR/
lists.gnu.org/archive/html/bug-bash/2016-09/msg00018.html
security.gentoo.org/glsa/201701-02