Bug 1379630 – CVE-2016-7543 bash: Specially crafted SHELLOPTS+PS4 variables allows command substitution

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Bug 1379630 - (CVE-2016-7543) CVE-2016-7543 bash: Specially crafted SHELLOPTS+PS4 variables allows command substitution

Summary:	CVE-2016-7543 bash: Specially crafted SHELLOPTS+PS4 variables allows command ...

Status:	NEW

Aliases:	CVE-2016-7543

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20160916,repor...
Keywords:	Security

Depends On:	1379634 1400793 1426026
Blocks:	1379635 1386080 1415638
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Reported:	2016-09-27 05:23 EDT by Adam Mariš
Modified:	2018-03-29 18:01 EDT (History)
CC List:	8 users (show)

See Also:
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:	---
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Last Closed:
Type:	---
Regression:	---
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Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2017:0725	normal	SHIPPED_LIVE	Moderate: bash security and bug fix update	2017-03-21 08:42:42 EDT
Red Hat Product Errata	RHSA-2017:1931	normal	SHIPPED_LIVE	Moderate: bash security and bug fix update	2017-08-01 14:26:59 EDT

Groups: None (edit)

Description Adam Mariš 2016-09-27 05:23:42 EDT

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 05:24:44 EDT

Created bash tracking bugs for this issue:

Affects: fedora-all [bug 1379634]

Comment 4 Dhiru Kholia 2016-10-05 03:34:05 EDT

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 07:14:32 EDT

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 16:33:10 EDT

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

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