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Red Hat Security Advisory 2017-1931-01

Red Hat Security Advisory 2017-1931-01
Posted Aug 2, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-1931-01 - The bash packages provide Bash, which is the default shell for Red Hat Enterprise Linux. Security Fix: 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. 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.

tags | advisory, arbitrary, shell, local, bash
systems | linux, redhat
advisories | CVE-2016-0634, CVE-2016-7543, CVE-2016-9401
MD5 | 7c8a3a75d795ab44095ecd3d7c25724d

Red Hat Security Advisory 2017-1931-01

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

Synopsis: Moderate: bash security and bug fix update
Advisory ID: RHSA-2017:1931-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:1931
Issue date: 2017-08-01
CVE Names: CVE-2016-0634 CVE-2016-7543 CVE-2016-9401
=====================================================================

1. Summary:

An update for bash is now available for Red Hat Enterprise Linux 7.

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 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 Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - 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 7.4 Release 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/):

1264101 - memleaks
1267478 - cd: -e: invalid option
1372806 - bash stack smash due to longjmp back to wait_builtin after it returned
1377496 - command "cat < <(cat)" doesn't end with EOF, CTRL+C terminates the whole shell
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 Client (v. 7):

Source:
bash-4.2.46-28.el7.src.rpm

x86_64:
bash-4.2.46-28.el7.x86_64.rpm
bash-debuginfo-4.2.46-28.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
bash-debuginfo-4.2.46-28.el7.x86_64.rpm
bash-doc-4.2.46-28.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
bash-4.2.46-28.el7.src.rpm

x86_64:
bash-4.2.46-28.el7.x86_64.rpm
bash-debuginfo-4.2.46-28.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
bash-debuginfo-4.2.46-28.el7.x86_64.rpm
bash-doc-4.2.46-28.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
bash-4.2.46-28.el7.src.rpm

aarch64:
bash-4.2.46-28.el7.aarch64.rpm
bash-debuginfo-4.2.46-28.el7.aarch64.rpm

ppc64:
bash-4.2.46-28.el7.ppc64.rpm
bash-debuginfo-4.2.46-28.el7.ppc64.rpm

ppc64le:
bash-4.2.46-28.el7.ppc64le.rpm
bash-debuginfo-4.2.46-28.el7.ppc64le.rpm

s390x:
bash-4.2.46-28.el7.s390x.rpm
bash-debuginfo-4.2.46-28.el7.s390x.rpm

x86_64:
bash-4.2.46-28.el7.x86_64.rpm
bash-debuginfo-4.2.46-28.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
bash-debuginfo-4.2.46-28.el7.aarch64.rpm
bash-doc-4.2.46-28.el7.aarch64.rpm

ppc64:
bash-debuginfo-4.2.46-28.el7.ppc64.rpm
bash-doc-4.2.46-28.el7.ppc64.rpm

ppc64le:
bash-debuginfo-4.2.46-28.el7.ppc64le.rpm
bash-doc-4.2.46-28.el7.ppc64le.rpm

s390x:
bash-debuginfo-4.2.46-28.el7.s390x.rpm
bash-doc-4.2.46-28.el7.s390x.rpm

x86_64:
bash-debuginfo-4.2.46-28.el7.x86_64.rpm
bash-doc-4.2.46-28.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
bash-4.2.46-28.el7.src.rpm

x86_64:
bash-4.2.46-28.el7.x86_64.rpm
bash-debuginfo-4.2.46-28.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
bash-debuginfo-4.2.46-28.el7.x86_64.rpm
bash-doc-4.2.46-28.el7.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/7/html/7.4_Release_Notes/index.html

8. Contact:

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

Copyright 2017 Red Hat, Inc.
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