Ispravljen nedostatak u zakrpi za bash

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Red Hat Security Advisory

Synopsis: Important: bash security update
Advisory ID: RHSA-2014:1306-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-1306.html
Issue date: 2014-09-26
CVE Names: CVE-2014-7169
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1. Summary:

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) – i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Client (v. 7) – x86_64
Red Hat Enterprise Linux Client Optional (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) – x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) – i386, x86_64
Red Hat Enterprise Linux Desktop (v. 6) – i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) – i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) – x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) – x86_64
Red Hat Enterprise Linux Server (v. 6) – i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server (v. 7) – ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) – i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) – i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) – i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – x86_64

3. Description:

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. For more information see the Knowledgebase article at
https://access.redhat.com/articles/1200223

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.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1146319 – CVE-2014-7169 bash: code execution via specially-crafted environment (Incomplete fix for CVE-2014-6271)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
bash-3.2-33.el5_11.4.src.rpm

i386:
bash-3.2-33.el5_11.4.i386.rpm
bash-debuginfo-3.2-33.el5_11.4.i386.rpm

x86_64:
bash-3.2-33.el5_11.4.x86_64.rpm
bash-debuginfo-3.2-33.el5_11.4.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
bash-3.2-33.el5_11.4.src.rpm

i386:
bash-3.2-33.el5_11.4.i386.rpm
bash-debuginfo-3.2-33.el5_11.4.i386.rpm

ia64:
bash-3.2-33.el5_11.4.i386.rpm
bash-3.2-33.el5_11.4.ia64.rpm
bash-debuginfo-3.2-33.el5_11.4.i386.rpm
bash-debuginfo-3.2-33.el5_11.4.ia64.rpm

ppc:
bash-3.2-33.el5_11.4.ppc.rpm
bash-debuginfo-3.2-33.el5_11.4.ppc.rpm

s390x:
bash-3.2-33.el5_11.4.s390x.rpm
bash-debuginfo-3.2-33.el5_11.4.s390x.rpm

x86_64:
bash-3.2-33.el5_11.4.x86_64.rpm
bash-debuginfo-3.2-33.el5_11.4.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):