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Red Hat 5-7 RHSA-2014:1306-01 Critical: Bash DoS Security Advisory

red hat
Calendar Grey September 25, 2014
Scroller Redhat
Crucial upgrade for bash addresses vulnerability in Red Hat Enterprise Linux. Examine advisory particulars and enhancements.
Updated bash packages that fix one security issue are now available for Red Hat Enterprise Linux 5, 6, and 7

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

Summary

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.

Topics%20covered

Topics Covered

security advisory software update DoS important Red Hat Enterprise bash CWE-78

References

https://access.redhat.com/security/cve/CVE-2014-7169 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/articles/1200223

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):
Source: bash-4.1.2-15.el6_5.2.src.rpm
i386: bash-4.1.2-15.el6_5.2.i686.rpm bash-debuginfo-4.1.2-15.el6_5.2.i686.rpm
x86_64: bash-4.1.2-15.el6_5.2.x86_64.rpm bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source: bash-4.1.2-15.el6_5.2.src.rpm
i386: bash-debuginfo-4.1.2-15.el6_5.2.i686.rpm bash-doc-4.1.2-15.el6_5.2.i686.rpm
x86_64: bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm bash-doc-4.1.2-15.el6_5.2.x86_64.rpm


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2014:1306-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2014:1306.html
Issue date: 2014-09-26

Topic

Updated bash packages that fix one security issue are now available for RedHat Enterprise Linux 5, 6, and 7.Red Hat Product Security has rated this update as having Important securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

Topics%20covered

Topics Covered

security advisory software update DoS important Red Hat Enterprise bash CWE-78

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

Bugs Fixed

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

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