Issued:
2017-03-21
Updated:
2017-03-21

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

Synopsis

Moderate: bash security and bug fix update

Type/Severity

Security Advisory Moderate

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 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.

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.

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

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for Scientific Computing6x86_64
Red Hat Enterprise Linux for Power, big endian6ppc64
Red Hat Enterprise Linux for IBM z Systems6s390x
Red Hat Enterprise Linux Workstation6x86_64
Red Hat Enterprise Linux Workstation6i386
Red Hat Enterprise Linux Server6x86_64
Red Hat Enterprise Linux Server6i386
Red Hat Enterprise Linux Server - Retired Extended Life Cycle Support6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems)6s390x
Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)6s390x
Red Hat Enterprise Linux Desktop6x86_64
Red Hat Enterprise Linux Desktop6i386

Updated Packages

  • bash-debuginfo-4.1.2-48.el6.i686.rpm
  • bash-doc-4.1.2-48.el6.s390x.rpm
  • bash-doc-4.1.2-48.el6.x86_64.rpm
  • bash-4.1.2-48.el6.src.rpm
  • bash-debuginfo-4.1.2-48.el6.ppc64.rpm
  • bash-debuginfo-4.1.2-48.el6.s390x.rpm
  • bash-4.1.2-48.el6.x86_64.rpm
  • bash-4.1.2-48.el6.i686.rpm
  • bash-4.1.2-48.el6.s390x.rpm
  • bash-doc-4.1.2-48.el6.i686.rpm
  • bash-doc-4.1.2-48.el6.ppc64.rpm
  • bash-4.1.2-48.el6.ppc64.rpm
  • bash-debuginfo-4.1.2-48.el6.x86_64.rpm

Fixes

CVEs

References

Additional information