Issued:

2013-02-21

Updated:

2013-02-21

RHSA-2013:0504 - Low: dhcp security and bug fix update

Synopsis

Low: dhcp security and bug fix update

Type/Severity

Security Advisory Low

Topic

Updated dhcp packages that fix one security issue and two 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. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Description

The dhcp packages provide the Dynamic Host Configuration Protocol (DHCP) that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address.

A flaw was found in the way the dhcpd daemon handled the expiration time of IPv6 leases. If dhcpd's configuration was changed to reduce the default IPv6 lease time, lease renewal requests for previously assigned leases could cause dhcpd to crash. (CVE-2012-3955)

This update also fixes the following bugs:

• Prior to this update, the DHCP server discovered only the first IP address of a network interface if the network interface had more than one configured IP address. As a consequence, the DHCP server failed to restart if the server was configured to serve only a subnet of the following IP addresses. This update modifies network interface addresses discovery code to find all addresses of a network interface. The DHCP server can also serve subnets of other addresses. (BZ#803540)

• Prior to this update, the dhclient rewrote the /etc/resolv.conf file with backup data after it was stopped even when the PEERDNS flag was set to "no" before shut down if the configuration file was changed while the dhclient ran with PEERDNS=yes. This update removes the backing up and restoring functions for this configuration file from the dhclient-script. Now, the dhclient no longer rewrites the /etc/resolv.conf file when stopped. (BZ#824622)

All users of DHCP are advised to upgrade to these updated packages, which fix these issues. After installing this update, all DHCP servers will be restarted automatically.

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

Affected Products

Updated Packages

• dhcp-common-4.1.1-34.P1.el6.x86_64.rpm
• dhcp-devel-4.1.1-34.P1.el6.x86_64.rpm
• dhcp-common-4.1.1-34.P1.el6.ppc64.rpm
• dhcp-debuginfo-4.1.1-34.P1.el6.s390.rpm
• dhcp-common-4.1.1-34.P1.el6.s390x.rpm
• dhcp-4.1.1-34.P1.el6.s390x.rpm
• dhcp-debuginfo-4.1.1-34.P1.el6.s390x.rpm
• dhcp-debuginfo-4.1.1-34.P1.el6.x86_64.rpm
• dhclient-4.1.1-34.P1.el6.s390x.rpm
• dhcp-debuginfo-4.1.1-34.P1.el6.ppc64.rpm
• dhclient-4.1.1-34.P1.el6.ppc64.rpm
• dhcp-devel-4.1.1-34.P1.el6.s390.rpm
• dhcp-debuginfo-4.1.1-34.P1.el6.ppc.rpm
• dhclient-4.1.1-34.P1.el6.x86_64.rpm
• dhcp-devel-4.1.1-34.P1.el6.ppc.rpm
• dhcp-4.1.1-34.P1.el6.x86_64.rpm
• dhcp-debuginfo-4.1.1-34.P1.el6.i686.rpm
• dhcp-common-4.1.1-34.P1.el6.i686.rpm
• dhcp-devel-4.1.1-34.P1.el6.s390x.rpm
• dhcp-4.1.1-34.P1.el6.i686.rpm
• dhcp-devel-4.1.1-34.P1.el6.i686.rpm
• dhclient-4.1.1-34.P1.el6.i686.rpm
• dhcp-4.1.1-34.P1.el6.src.rpm
• dhcp-devel-4.1.1-34.P1.el6.ppc64.rpm
• dhcp-4.1.1-34.P1.el6.ppc64.rpm

Fixes

• This content is not included.BZ - 803540
• This content is not included.BZ - 824622
• This content is not included.BZ - 856766

CVEs

• CVE-2012-3955

References

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

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.