Bug 1396383 (CVE-2016-9401) - CVE-2016-9401 bash: popd controlled free
Summary: CVE-2016-9401 bash: popd controlled free
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-9401
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1396387 1400793 1429838
Blocks: 1386080 1396388
TreeView+ depends on / blocked
 
Reported: 2016-11-18 08:52 UTC by Andrej Nemec
Modified: 2019-09-29 14:00 UTC (History)
9 users (show)

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.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:02:18 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:0725 0 normal SHIPPED_LIVE Moderate: bash security and bug fix update 2017-03-21 12:42:42 UTC
Red Hat Product Errata RHSA-2017:1931 0 normal SHIPPED_LIVE Moderate: bash security and bug fix update 2017-08-01 18:26:59 UTC

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
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