[RHSA-2017:0725-01] Moderate: bash security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Moderate: bash security and bug fix update

Advisory ID: RHSA-2017:0725-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0725.html

Issue date: 2017-03-21

CVE Names: CVE-2016-0634 CVE-2016-7543 CVE-2016-9401

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1. Summary:

 

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 impact

of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which

gives a detailed severity rating, is available for each vulnerability from

the CVE link(s) in the References section.

 

2. 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

 

3. Description:

 

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.

 

4. 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

 

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

 

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

 

6. 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:

bash-debuginfo-4.1.2-48.el6.s390x.rpm

bash-doc-4.1.2-48.el6.s390x.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 Workstation (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 Workstation 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

 

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/

 

7. 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

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2017 Red Hat, Inc.

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