Bug 1396383 (CVE-2016-9401)

Summary:	CVE-2016-9401 bash: popd controlled free
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	admiller, carnil, dominik.mierzejewski, kdudka, mkyral, sardella, security-response-team, slawomir, svashisht
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A denial of service flaw was found in the way bash handled popd commands. A poorly written shell script could cause bash to crash resulting in a local denial of service limited to a specific bash session.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:02:18 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:	1396387, 1400793, 1429838
Bug Blocks:	1386080, 1396388

Description Andrej Nemec 2016-11-18 08:52:56 UTC

A vulnerability was found in popd. It can be tricked to free a user supplied address in the following way:

$ popd +-111111

This could be used to bypass restricted shells (rsh) on some environments to cause use-after-free.

References:

http://seclists.org/oss-sec/2016/q4/445

Comment 1 Andrej Nemec 2016-11-18 08:55:33 UTC

Created bash tracking bugs for this issue:

Affects: fedora-all [bug 1396387]

Comment 5 Dhiru Kholia 2016-11-29 06:16:42 UTC

Upstream report:

https://lists.gnu.org/archive/html/bug-bash/2016-11/msg00099.html

Upstream patch:

https://lists.gnu.org/archive/html/bug-bash/2016-11/msg00116.html

Comment 19 errata-xmlrpc 2017-03-21 11:14:40 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 20 errata-xmlrpc 2017-08-01 20:33:20 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