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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Critical: bash Shift_JIS security update
Advisory ID:       RHSA-2014:1295-01
Product:           RHEL S-JIS Service
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-1295.html
Issue date:        2014-09-24
CVE Names:         CVE-2014-6271 
=====================================================================

1. Summary:

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

Red Hat Product Security has rated this update as having Critical 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:

SJIS (v. 5.11.z Server) - i386, ia64, x86_64
SJIS for RHEL 6 Server - i386, 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.

Shift_JIS, also known as "SJIS", is a character encoding for the Japanese
language. This package provides bash support for the Shift_JIS encoding.

A flaw was found in the way Bash evaluated certain specially crafted
environment variables. An attacker could 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-2014-6271)

For additional information on the CVE-2014-6271 flaw, refer to the
Knowledgebase article at https://access.redhat.com/articles/1200223

Red Hat would like to thank Stephane Chazelas for reporting this issue.

All users who require Shift_JIS encoding support with Bash built-in
functions 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/):

1141597 - CVE-2014-6271 bash: specially-crafted environment variables can be used to inject shell commands

6. Package List:

SJIS (v. 5.11.z Server):

Source:
bash-3.2-33.el5_11.1.sjis.1.src.rpm

i386:
bash-3.2-33.el5_11.1.sjis.1.i386.rpm
bash-debuginfo-3.2-33.el5_11.1.sjis.1.i386.rpm

ia64:
bash-3.2-33.el5_11.1.sjis.1.i386.rpm
bash-3.2-33.el5_11.1.sjis.1.ia64.rpm
bash-debuginfo-3.2-33.el5_11.1.sjis.1.i386.rpm
bash-debuginfo-3.2-33.el5_11.1.sjis.1.ia64.rpm

x86_64:
bash-3.2-33.el5_11.1.sjis.1.x86_64.rpm
bash-debuginfo-3.2-33.el5_11.1.sjis.1.x86_64.rpm

SJIS for RHEL 6 Server:

Source:
bash-4.1.2-15.el6_5.1.sjis.1.src.rpm

i386:
bash-4.1.2-15.el6_5.1.sjis.1.i686.rpm
bash-debuginfo-4.1.2-15.el6_5.1.sjis.1.i686.rpm
bash-doc-4.1.2-15.el6_5.1.sjis.1.i686.rpm

x86_64:
bash-4.1.2-15.el6_5.1.sjis.1.x86_64.rpm
bash-debuginfo-4.1.2-15.el6_5.1.sjis.1.x86_64.rpm
bash-doc-4.1.2-15.el6_5.1.sjis.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2014-6271.html
https://access.redhat.com/security/updates/classification/#critical
https://access.redhat.com/articles/1200223

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2014 Red Hat, Inc.
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