Kritična ranjivost programskog paketa bash

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by ncert - 25. rujna 2014.25. rujna 2014.0

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Red Hat Security Advisory

Synopsis: Critical: bash security update
Advisory ID: RHSA-2014:1293-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-1293.html
Issue date: 2014-09-24
CVE Names: CVE-2014-6271
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1. Summary:

Updated bash packages that fix one security issue are now available for Red
Hat Enterprise Linux 5, 6, and 7.

Red Hat Product Security has rated this update as having Critical security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) – i386, ia64, ppc, s390x, x86_64
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 Desktop (v. 5 client) – i386, x86_64
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 (v. 7) – ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) – i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) – i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) – i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – x86_64

3. Description:

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.

A flaw was found in the way Bash evaluated certain specially crafted
environment variables. An attacker could 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-2014-6271)

For additional information on the CVE-2014-6271 flaw, refer to the
Knowledgebase article at https://access.redhat.com/articles/1200223

Red Hat would like to thank Stephane Chazelas for reporting this issue.

All bash users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue.

4. 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

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

1141597 – CVE-2014-6271 bash: specially-crafted environment variables can be used to inject shell commands

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
bash-3.2-33.el5.1.src.rpm

i386:
bash-3.2-33.el5.1.i386.rpm
bash-debuginfo-3.2-33.el5.1.i386.rpm

x86_64:
bash-3.2-33.el5.1.x86_64.rpm
bash-debuginfo-3.2-33.el5.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
bash-3.2-33.el5.1.src.rpm

i386:
bash-3.2-33.el5.1.i386.rpm
bash-debuginfo-3.2-33.el5.1.i386.rpm

ia64:
bash-3.2-33.el5.1.i386.rpm
bash-3.2-33.el5.1.ia64.rpm
bash-debuginfo-3.2-33.el5.1.i386.rpm
bash-debuginfo-3.2-33.el5.1.ia64.rpm

ppc:
bash-3.2-33.el5.1.ppc.rpm
bash-debuginfo-3.2-33.el5.1.ppc.rpm

s390x:
bash-3.2-33.el5.1.s390x.rpm
bash-debuginfo-3.2-33.el5.1.s390x.rpm

x86_64:
bash-3.2-33.el5.1.x86_64.rpm
bash-debuginfo-3.2-33.el5.1.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):