Red Hat Security Advisory: busybox security and bug fix update Security Advisory secalert@redhat.com Red Hat Security Response Team RHSA-2012:0810 Final 4 4 2012-06-20T08:19:00Z Current version 2012-06-20T08:19:00Z 2012-06-20T08:19:00Z Red Hat rhsa-to-cvrf 1.0.1484 2012-06-20T09:00:22Z 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. 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. Please see https://www.redhat.com/footer/terms-of-use.html Copyright © 2012 Red Hat, Inc. All rights reserved. Low https://rhn.redhat.com/errata/RHSA-2012-0810.html https://rhn.redhat.com/errata/RHSA-2012-0810.html https://access.redhat.com/security/updates/classification/#low https://access.redhat.com/security/updates/classification/#low https://bugzilla.redhat.com/show_bug.cgi?id=752134 https://bugzilla.redhat.com/show_bug.cgi?id=752134 https://bugzilla.redhat.com/show_bug.cgi?id=809092 https://bugzilla.redhat.com/show_bug.cgi?id=809092 Red Hat Enterprise Linux Desktop Optional (v. 6) Red Hat Enterprise Linux HPC Node Optional (v. 6) Red Hat Enterprise Linux Workstation Optional (v. 6) Red Hat Enterprise Linux Workstation (v. 6) Red Hat Enterprise Linux HPC Node (v. 6) Red Hat Enterprise Linux Server Optional (v. 6) Red Hat Enterprise Linux Desktop (v. 6) Red Hat Enterprise Linux Server (v. 6) busybox-1.15.1-15.el6.src.rpm busybox-1.15.1-15.el6 as a component of Red Hat Enterprise Linux Desktop Optional (v. 6) busybox-1.15.1-15.el6 as a component of Red Hat Enterprise Linux HPC Node Optional (v. 6) busybox-1.15.1-15.el6 as a component of Red Hat Enterprise Linux Workstation Optional (v. 6) busybox-1.15.1-15.el6 as a component of Red Hat Enterprise Linux Workstation (v. 6) busybox-1.15.1-15.el6 as a component of Red Hat Enterprise Linux HPC Node (v. 6) busybox-1.15.1-15.el6 as a component of Red Hat Enterprise Linux Server Optional (v. 6) busybox-1.15.1-15.el6 as a component of Red Hat Enterprise Linux Desktop (v. 6) busybox-1.15.1-15.el6 as a component of Red Hat Enterprise Linux Server (v. 6) 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. 2006-07-25T00:00:00Z 2006-08-08T00:00:00Z CVE-2006-1168 6Client-optional:busybox-1.15.1-15.el6 6Client:busybox-1.15.1-15.el6 6ComputeNode-optional:busybox-1.15.1-15.el6 6ComputeNode:busybox-1.15.1-15.el6 6Server-optional:busybox-1.15.1-15.el6 6Server:busybox-1.15.1-15.el6 6Workstation-optional:busybox-1.15.1-15.el6 6Workstation:busybox-1.15.1-15.el6 Moderate 5.1 AV:N/AC:H/Au:N/C:P/I:P/A:P 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 https://rhn.redhat.com/errata/RHSA-2012-0810.html https://www.redhat.com/security/data/cve/CVE-2006-1168.html CVE-2006-1168 https://bugzilla.redhat.com/show_bug.cgi?id=201919 bz#201919: CVE-2006-1168 ncompress: .bss buffer underflow in decompression Red Hat would like to thank Tavis Ormandy of the Google Security Team for reporting this issue. 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. 2011-03-23T00:00:00Z 2011-03-18T00:00:00Z CVE-2011-2716 6Client-optional:busybox-1.15.1-15.el6 6Client:busybox-1.15.1-15.el6 6ComputeNode-optional:busybox-1.15.1-15.el6 6ComputeNode:busybox-1.15.1-15.el6 6Server-optional:busybox-1.15.1-15.el6 6Server:busybox-1.15.1-15.el6 6Workstation-optional:busybox-1.15.1-15.el6 6Workstation:busybox-1.15.1-15.el6 Low 6.8 AV:A/AC:H/Au:N/C:C/I:C/A:C 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 https://rhn.redhat.com/errata/RHSA-2012-0810.html https://www.redhat.com/security/data/cve/CVE-2011-2716.html CVE-2011-2716 https://bugzilla.redhat.com/show_bug.cgi?id=725364 bz#725364: CVE-2011-2716 busybox: udhcpc insufficient checking of DHCP options