[RHSA-2012:0810-04] Low: busybox security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Low: busybox security and bug fix update

Advisory ID: RHSA-2012:0810-04

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0810.html

Issue date: 2012-06-20

CVE Names: CVE-2006-1168 CVE-2011-2716

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1. Summary:

 

Updated busybox packages that fix two security issues and several bugs are

now available for Red Hat Enterprise Linux 6.

 

The Red Hat Security Response Team has rated this update as having low

security impact. Common Vulnerability Scoring System (CVSS) base scores,

which give detailed severity ratings, are available for each vulnerability

from the CVE links 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:

 

BusyBox provides a single binary that includes versions of a large number

of system commands, including a shell. This can be very useful for

recovering from certain types of system failures, particularly those

involving broken shared libraries.

 

A buffer underflow flaw was found in the way the uncompress utility of

BusyBox expanded certain archive files compressed using Lempel-Ziv

compression. If a user were tricked into expanding a specially-crafted

archive file with uncompress, it could cause BusyBox to crash or,

potentially, execute arbitrary code with the privileges of the user

running BusyBox. (CVE-2006-1168)

 

The BusyBox DHCP client, udhcpc, did not sufficiently sanitize certain

options provided in DHCP server replies, such as the client hostname. A

malicious DHCP server could send such an option with a specially-crafted

value to a DHCP client. If this option's value was saved on the client

system, and then later insecurely evaluated by a process that assumes the

option is trusted, it could lead to arbitrary code execution with the

privileges of that process. Note: udhcpc is not used on Red Hat Enterprise

Linux by default, and no DHCP client script is provided with the busybox

packages. (CVE-2011-2716)

 

This update also fixes the following bugs:

 

* Prior to this update, the "findfs" command did not recognize Btrfs

partitions. As a consequence, an error message could occur when dumping a

core file. This update adds support for recognizing such partitions so

the problem no longer occurs. (BZ#751927)

 

* If the "grep" command was used with the "-F" and "-i" options at the

same time, the "-i" option was ignored. As a consequence, the "grep -iF"

command incorrectly performed a case-sensitive search instead of an

insensitive search. A patch has been applied to ensure that the combination

of the "-F" and "-i" options works as expected. (BZ#752134)

 

* Prior to this update, the msh shell did not support the "set -o pipefail"

command. This update adds support for this command. (BZ#782018)

 

* Previously, the msh shell could terminate unexpectedly with a

segmentation fault when attempting to execute an empty command as a result

of variable substitution (for example msh -c '$nonexistent_variable').

With this update, msh has been modified to correctly interpret such

commands and no longer crashes in this scenario. (BZ#809092)

 

* Previously, the msh shell incorrectly executed empty loops. As a

consequence, msh never exited such a loop even if the loop condition was

false, which could cause scripts using the loop to become unresponsive.

With this update, msh has been modified to execute and exit empty loops

correctly, so that hangs no longer occur. (BZ#752132)

 

All users of busybox are advised to upgrade to these updated packages,

which contain backported patches to fix these issues.

 

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/knowledge/articles/11258

 

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

 

201919 - CVE-2006-1168 ncompress: .bss buffer underflow in decompression

725364 - CVE-2011-2716 busybox: udhcpc insufficient checking of DHCP options

752134 - "busybox grep -Fi" doesn't work as expected

809092 - msh crasher bug

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/busybox-1.15.1-15.el6.src.rpm

 

i386:

busybox-1.15.1-15.el6.i686.rpm

 

x86_64:

busybox-1.15.1-15.el6.x86_64.rpm

 

Red Hat Enterprise Linux Desktop Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/busybox-1.15.1-15.el6.src.rpm

 

i386:

busybox-petitboot-1.15.1-15.el6.i686.rpm

 

x86_64:

busybox-petitboot-1.15.1-15.el6.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/busybox-1.15.1-15.el6.src.rpm

 

x86_64:

busybox-1.15.1-15.el6.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/busybox-1.15.1-15.el6.src.rpm

 

x86_64:

busybox-petitboot-1.15.1-15.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/busybox-1.15.1-15.el6.src.rpm

 

i386:

busybox-1.15.1-15.el6.i686.rpm

 

ppc64:

busybox-1.15.1-15.el6.ppc64.rpm

 

s390x:

busybox-1.15.1-15.el6.s390x.rpm

 

x86_64:

busybox-1.15.1-15.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/busybox-1.15.1-15.el6.src.rpm

 

i386:

busybox-petitboot-1.15.1-15.el6.i686.rpm

 

ppc64:

busybox-petitboot-1.15.1-15.el6.ppc64.rpm

 

s390x:

busybox-petitboot-1.15.1-15.el6.s390x.rpm

 

x86_64:

busybox-petitboot-1.15.1-15.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/busybox-1.15.1-15.el6.src.rpm

 

i386:

busybox-1.15.1-15.el6.i686.rpm

 

x86_64:

busybox-1.15.1-15.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/busybox-1.15.1-15.el6.src.rpm

 

i386:

busybox-petitboot-1.15.1-15.el6.i686.rpm

 

x86_64:

busybox-petitboot-1.15.1-15.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/#package

 

7. References:

 

https://www.redhat.com/security/data/cve/CVE-2006-1168.html

https://www.redhat.com/security/data/cve/CVE-2011-2716.html

https://access.redhat.com/security/updates/classification/#low

 

8. Contact:

 

The Red Hat security contact is . More contact

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

 

Copyright 2012 Red Hat, Inc.

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