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Red Hat Enterprise Linux: RHSA-2014:1311-01 Critical Bash Executable Threat

red hat
Calendar Grey September 26, 2014
Scroller Redhat
Important bash package revisions for Red Hat address vulnerabilities. Promptly update to safeguard against possible risks.
Updated bash packages that fix one security issue are now available for Red Hat Enterprise Linux 4 Extended Life Cycle Support, Red Hat Enterprise Linux 5.6 Long Life, Red Hat Ente...

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 the 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 security update red hat code execution remote access important bash

References

https://access.redhat.com/security/cve/CVE-2014-7169 https://access.redhat.com/security/cve/CVE-2014-7186 https://access.redhat.com/security/cve/CVE-2014-7187 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/articles/1200223

Package List

Red Hat Enterprise Linux AS (v. 4 ELS):
Source: bash-3.0-27.el4.4.src.rpm
i386: bash-3.0-27.el4.4.i386.rpm bash-debuginfo-3.0-27.el4.4.i386.rpm
ia64: bash-3.0-27.el4.4.i386.rpm bash-3.0-27.el4.4.ia64.rpm bash-debuginfo-3.0-27.el4.4.i386.rpm bash-debuginfo-3.0-27.el4.4.ia64.rpm
x86_64: bash-3.0-27.el4.4.x86_64.rpm bash-debuginfo-3.0-27.el4.4.x86_64.rpm
Red Hat Enterprise Linux ES (v. 4 ELS):
Source: bash-3.0-27.el4.4.src.rpm
i386: bash-3.0-27.el4.4.i386.rpm bash-debuginfo-3.0-27.el4.4.i386.rpm
x86_64: bash-3.0-27.el4.4.x86_64.rpm bash-debuginfo-3.0-27.el4.4.x86_64.rpm
Red Hat Enterprise Linux LL (v. 5.6 server):
Source: bash-3.2-24.el5_6.2.src.rpm
i386: bash-3.2-24.el5_6.2.i386.rpm bash-debuginfo-3.2-24.el5_6.2.i386.rpm
ia64: bash-3.2-24.el5_6.2.i386.rpm bash-3.2-24.el5_6.2.ia64.rpm bash-debuginfo-3.2-24.el5_6.2.i386.rpm bash-debuginfo-3.2-24.el5_6.2.ia64.rpm
x86_64: bash-3.2-24.el5_6.2.x86_64.rpm bash-debuginfo-3.2-24.el5_6.2.x86_64.rpm
Red Hat Enterprise Linux EUS (v. 5.9 server):
Source: bash-3.2-32.el5_9.3.src.rpm
i386: bash-3.2-32.el5_9.3.i386.rpm bash-debuginfo-3.2-32.el5_9.3.i386.rpm
ia64: bash-3.2-32.el5_9.3.i386.rpm bash-3.2-32.el5_9.3.ia64.rpm bash-debuginfo-3.2-32.el5_9.3.i386.rpm bash-debuginfo-3.2-32.el5_9.3.ia64.rpm
ppc: bash-3.2-32.el5_9.3.ppc.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2014:1311-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2014:1311.html
Issue date: 2014-09-26

Topic

Updated bash packages that fix one security issue are now available for RedHat Enterprise Linux 4 Extended Life Cycle Support, Red Hat EnterpriseLinux 5.6 Long Life, Red Hat Enterprise Linux 5.9 Extended Update Support,Red Hat Enterprise Linux 6.2 Advanced Update Support, and Red HatEnterprise Linux 6.4 Extended Update Support.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 security update red hat code execution remote access important bash

Relevant Releases Architectures

Red Hat Enterprise Linux AS (v. 4 ELS) - i386, ia64, x86_64

Red Hat Enterprise Linux AUS (v. 6.2 server) - x86_64

Red Hat Enterprise Linux Compute Node Optional EUS (v. 6.4) - x86_64

Red Hat Enterprise Linux ES (v. 4 ELS) - i386, x86_64

Red Hat Enterprise Linux EUS (v. 5.9 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux HPC Node EUS (v. 6.4) - x86_64

Red Hat Enterprise Linux LL (v. 5.6 server) - i386, ia64, x86_64

Red Hat Enterprise Linux Server EUS (v. 6.4) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.2) - x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 6.4) - i386, ppc64, s390x, 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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