Bug 1379630 (CVE-2016-7543)

Summary:	CVE-2016-7543 bash: Specially crafted SHELLOPTS+PS4 variables allows command substitution
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	admiller, carnil, fhirtz, kdudka, mkyral, sardella, slawomir, svashisht
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	bash 4.4	Doc Type:	If docs needed, set a value
Doc Text:	An arbitrary command injection flaw was found in the way bash processed the SHELLOPTS and PS4 environment variables. A local, authenticated attacker could use this flaw to exploit poorly written setuid programs to elevate their privileges under certain circumstances.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:59:08 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1379634, 1400793, 1426026
Bug Blocks:	1379635, 1386080, 1415638

Description Adam Mariš 2016-09-27 09:23:42 UTC

Shells running as root inherited PS4 from the environment, allowing PS4 expansion performing command substitution. Local attacker could gain arbitrary code execution via bogus setuid binaries using system()/popen() by specially crafting SHELLOPTS+PS4 environment variables.

Public announcement:

http://seclists.org/oss-sec/2016/q3/617

Comment 1 Adam Mariš 2016-09-27 09:24:44 UTC

Created bash tracking bugs for this issue:

Affects: fedora-all [bug 1379634]

Comment 4 Dhiru Kholia 2016-10-05 07:34:05 UTC

Upstream patch (for bash-4.3):

http://lists.gnu.org/archive/html/bug-bash/2016-10/msg00009.html

Comment 11 errata-xmlrpc 2017-03-21 11:14:32 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:0725 https://rhn.redhat.com/errata/RHSA-2017-0725.html

Comment 12 errata-xmlrpc 2017-08-01 20:33:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1931 https://access.redhat.com/errata/RHSA-2017:1931