Important CentOS bash Security Update


bash-3.2-33.el5_10.4.i386.rpm, bash-3.2-33.el5_10.4.src.rpm, bash-3.2-33.el5_10.4.x86_64.rpm, bash-3.2-33.el5_11.4.i386.rpm, bash-3.2-33.el5_11.4.src.rpm, bash-3.2-33.el5_11.4.x86_64.rpm, bash-4.1.2-15.el6_5.2.i686.rpm, bash-4.1.2-15.el6_5.2.src.rpm, bash-4.1.2-15.el6_5.2.x86_64.rpm, bash-4.2.45-5.el7_0.4.src.rpm, bash-4.2.45-5.el7_0.4.x86_64.rpm, bash-doc-4.1.2-15.el6_5.2.i686.rpm, bash-doc-4.1.2-15.el6_5.2.x86_64.rpm, bash-doc-4.2.45-5.el7_0.4.x86_64.rpm,,,,
2018-01-18 11:07
2017-07-27 19:07
2017-04-01 19:08
2017-01-05 20:12


[Updated September 30, 2014]
This advisory has been updated with information on restarting system
services after applying this update. No changes have been made to the
original packages.

Updated bash packages that fix one security issue are now available for Red
Hat Enterprise Linux 5, 6, and 7.

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

The GNU Bourne Again shell (Bash) is a shell and command language
interpreter compatible with the Bourne shell (sh). Bash is the default
shell for Red Hat Enterprise Linux.

It was found that the fix for CVE-2014-6271 was incomplete, and Bash still
allowed certain characters to be injected into other environments via
specially crafted environment variables. An attacker could potentially use
this flaw to override or bypass environment restrictions to execute shell
commands. Certain services and applications allow remote unauthenticated
attackers to provide environment variables, allowing them to exploit this
issue. (CVE-2014-7169)

Applications which directly create bash functions as environment variables
need to be made aware of changes to the way names are handled by this
update. Note that certain services, screen sessions, and tmux sessions may
need to be restarted, and affected interactive users may need to re-login.
Installing these updated packages without restarting services will address
the vulnerability, but functionality may be impacted until affected
services are restarted. For more information see the Knowledgebase article

Note: Docker users are advised to use "yum update" within their containers,
and to commit the resulting changes.

For additional information on CVE-2014-6271 and CVE-2014-7169, refer to the
aforementioned Knowledgebase article.

All bash users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue.
Please see

Am I vulnerable?

The constraints below list the versions that this vulnerability is patched in, and versions that are unaffected. If a patch is ready but unrealeased, then it is pending.

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Affected package information

Release Package Patched in
5 bash bash-3.2-33.el5_10.4.src.rpm
bash bash-3.2-33.el5_10.4.i386.rpm
bash bash-3.2-33.el5_10.4.x86_64.rpm
bash bash-3.2-33.el5_11.4.i386.rpm
bash bash-3.2-33.el5_11.4.src.rpm
bash bash-3.2-33.el5_11.4.x86_64.rpm
6 bash bash-4.1.2-15.el6_5.2.src.rpm
bash bash-4.1.2-15.el6_5.2.i686.rpm
bash bash-4.1.2-15.el6_5.2.x86_64.rpm
bash-doc bash-doc-4.1.2-15.el6_5.2.i686.rpm
bash-doc bash-doc-4.1.2-15.el6_5.2.x86_64.rpm
7 bash bash-4.2.45-5.el7_0.4.src.rpm
bash bash-4.2.45-5.el7_0.4.x86_64.rpm
bash-doc bash-doc-4.2.45-5.el7_0.4.x86_64.rpm