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Red Hat Enterprise Linux 6 RHSA-2017:0725 Moderate Bash Security Fix

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Calendar Grey March 21, 2017
Scroller Redhat
An upgrade is now ready for bash on Red Hat Enterprise Linux 6, which resolves moderate security vulnerabilities and some bugs.
An update for bash is now available for Red Hat Enterprise Linux 6

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

The bash packages provide Bash (Bourne-again shell), which is the default shell for Red Hat Enterprise Linux.
Security Fix(es):
* An arbitrary command injection flaw was found in the way bash processed the hostname value. A malicious DHCP server could use this flaw to execute arbitrary commands on the DHCP client machines running bash under specific circumstances. (CVE-2016-0634)
* An arbitrary command injection flaw was found in the way bash processed the SHELLOPTS and PS4 environment variables. A local, authenticated attacker could use this flaw to exploit poorly written setuid programs to elevate their privileges under certain circumstances. (CVE-2016-7543)
* A denial of service flaw was found in the way bash handled popd commands. A poorly written shell script could cause bash to crash resulting in a local denial of service limited to a specific bash session. (CVE-2016-9401)
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory moderate bug fix security fix Red Hat Enterprise Linux command injection bash

References

https://access.redhat.com/security/cve/CVE-2016-0634 https://access.redhat.com/security/cve/CVE-2016-7543 https://access.redhat.com/security/cve/CVE-2016-9401 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_Notes/index.html

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: bash-4.1.2-48.el6.src.rpm
i386: bash-4.1.2-48.el6.i686.rpm bash-debuginfo-4.1.2-48.el6.i686.rpm
x86_64: bash-4.1.2-48.el6.x86_64.rpm bash-debuginfo-4.1.2-48.el6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: bash-debuginfo-4.1.2-48.el6.i686.rpm bash-doc-4.1.2-48.el6.i686.rpm
x86_64: bash-debuginfo-4.1.2-48.el6.x86_64.rpm bash-doc-4.1.2-48.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: bash-4.1.2-48.el6.src.rpm
x86_64: bash-4.1.2-48.el6.x86_64.rpm bash-debuginfo-4.1.2-48.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64: bash-debuginfo-4.1.2-48.el6.x86_64.rpm bash-doc-4.1.2-48.el6.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: bash-4.1.2-48.el6.src.rpm
i386: bash-4.1.2-48.el6.i686.rpm bash-debuginfo-4.1.2-48.el6.i686.rpm
ppc64: bash-4.1.2-48.el6.ppc64.rpm bash-debuginfo-4.1.2-48.el6.ppc64.rpm
s390x: bash-4.1.2-48.el6.s390x.rpm bash-debuginfo-4.1.2-48.el6.s390x.rpm
x86_64: bash-4.1.2-48.el6.x86_64.rpm bash-debuginfo-4.1.2-48.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
i386: bash-debuginfo-4.1.2-48.el6.i686.rpm bash-doc-4.1.2-48.el6.i686.rpm
ppc64: bash-debuginfo-4.1.2-48.el6.ppc64.rpm bash-doc-4.1.2-48.el6.ppc64.rpm
s390x:

Read the Full Advisory


Advisory ID: RHSA-2017:0725-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0725.html
Issue date: 2017-03-21

Topic

An update for bash is now available for Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate bug fix security fix Red Hat Enterprise Linux command injection bash

Relevant Releases Architectures

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 Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

Bugs Fixed

1377613 - CVE-2016-0634 bash: Arbitrary code execution via malicious hostname

1379630 - CVE-2016-7543 bash: Specially crafted SHELLOPTS+PS4 variables allows command substitution

1396383 - CVE-2016-9401 bash: popd controlled free

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