Bash before 4.4 allows local users to execute arbitrary commands with root privileges via crafted SHELLOPTS and PS4 environment variables.
http://rhn.redhat.com/errata/RHSA-2017-0725.html
http://www.openwall.com/lists/oss-security/2016/09/26/9
http://www.securityfocus.com/bid/93183
http://www.securitytracker.com/id/1037812
https://access.redhat.com/errata/RHSA-2017:1931
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05388115
https://lists.gnu.org/archive/html/bug-bash/2016-09/msg00018.html
Source: MITRE
Published: 2017-01-19
Updated: 2018-01-05
Type: CWE-20
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
Base Score: 8.4
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.5
Severity: HIGH