Red Hat Security Advisory: dhcp security update Security Advisory secalert@redhat.com Red Hat Security Response Team RHSA-2012:1141 Final 1 1 2012-08-03T00:14:00Z Current version 2012-08-03T00:14:00Z 2012-08-03T00:14:00Z Red Hat rhsa-to-cvrf 1.0.1484 2012-08-03T00:27:02Z Updated dhcp packages that fix three security issues are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate 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. The Dynamic Host Configuration Protocol (DHCP) is a protocol 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 denial of service flaw was found in the way the dhcpd daemon handled zero-length client identifiers. A remote attacker could use this flaw to send a specially-crafted request to dhcpd, possibly causing it to enter an infinite loop and consume an excessive amount of CPU time. (CVE-2012-3571) Two memory leak flaws were found in the dhcpd daemon. A remote attacker could use these flaws to cause dhcpd to exhaust all available memory by sending a large number of DHCP requests. (CVE-2012-3954) Upstream acknowledges Markus Hietava of the Codenomicon CROSS project as the original reporter of CVE-2012-3571, and Glen Eustace of Massey University, New Zealand, as the original reporter of CVE-2012-3954. Users of DHCP should upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, all DHCP servers will be restarted automatically. Please see https://www.redhat.com/footer/terms-of-use.html Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate https://rhn.redhat.com/errata/RHSA-2012-1141.html https://rhn.redhat.com/errata/RHSA-2012-1141.html https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/security/updates/classification/#moderate http://www.isc.org/software/dhcp/advisories/cve-2012-3571 http://www.isc.org/software/dhcp/advisories/cve-2012-3571 http://www.isc.org/software/dhcp/advisories/cve-2012-3954 http://www.isc.org/software/dhcp/advisories/cve-2012-3954 Red Hat Enterprise Linux HPC Node Optional (v. 6) Red Hat Enterprise Linux Server (v. 6) Red Hat Enterprise Linux Workstation (v. 6) Red Hat Enterprise Linux Desktop Optional (v. 6) Red Hat Enterprise Linux Workstation Optional (v. 6) Red Hat Enterprise Linux HPC Node (v. 6) Red Hat Enterprise Linux Desktop (v. 6) Red Hat Enterprise Linux Server Optional (v. 6) dhcp-4.1.1-31.P1.el6_3.1.src.rpm dhcp-4.1.1-31.P1.el6_3.1 as a component of Red Hat Enterprise Linux HPC Node Optional (v. 6) dhcp-4.1.1-31.P1.el6_3.1 as a component of Red Hat Enterprise Linux Server (v. 6) dhcp-4.1.1-31.P1.el6_3.1 as a component of Red Hat Enterprise Linux Workstation (v. 6) dhcp-4.1.1-31.P1.el6_3.1 as a component of Red Hat Enterprise Linux Desktop Optional (v. 6) dhcp-4.1.1-31.P1.el6_3.1 as a component of Red Hat Enterprise Linux Workstation Optional (v. 6) dhcp-4.1.1-31.P1.el6_3.1 as a component of Red Hat Enterprise Linux HPC Node (v. 6) dhcp-4.1.1-31.P1.el6_3.1 as a component of Red Hat Enterprise Linux Desktop (v. 6) dhcp-4.1.1-31.P1.el6_3.1 as a component of Red Hat Enterprise Linux Server Optional (v. 6) A denial of service flaw was found in the way the dhcpd daemon handled zero-length client identifiers. A remote attacker could use this flaw to send a specially-crafted request to dhcpd, possibly causing it to enter an infinite loop and consume an excessive amount of CPU time. Upstream acknowledges Markus Hietava of the Codenomicon CROSS project as the original reporter of CVE-2012-3571, and Glen Eustace of Massey University, New Zealand, as the original reporter of CVE-2012-3954. 2012-07-23T00:00:00Z 2012-07-24T00:00:00Z CVE-2012-3571 6Client-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Client-optional-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6ComputeNode-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6ComputeNode-optional-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Server-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Server-optional-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Workstation-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Workstation-optional-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 Moderate 3.3 AV:A/AC:L/Au:N/C:N/I:N/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-2012-1141.html https://www.redhat.com/security/data/cve/CVE-2012-3571.html CVE-2012-3571 https://bugzilla.redhat.com/show_bug.cgi?id=842420 bz#842420: CVE-2012-3571 dhcp: DoS due to error in handling malformed client identifiers Upstream acknowledges Markus Hietava of Codenomicon CROSS project as the original reporter of this issue. Two memory leak flaws were found in the dhcpd daemon. A remote attacker could use these flaws to cause dhcpd to exhaust all available memory by sending a large number of DHCP requests. Upstream acknowledges Markus Hietava of the Codenomicon CROSS project as the original reporter of CVE-2012-3571, and Glen Eustace of Massey University, New Zealand, as the original reporter of CVE-2012-3954. 2012-07-23T00:00:00Z 2012-07-24T00:00:00Z CVE-2012-3954 6Client-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Client-optional-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6ComputeNode-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6ComputeNode-optional-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Server-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Server-optional-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Workstation-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 6Workstation-optional-6.3.z:dhcp-4.1.1-31.P1.el6_3.1 Moderate 3.3 AV:A/AC:L/Au:N/C:N/I:N/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-2012-1141.html https://www.redhat.com/security/data/cve/CVE-2012-3954.html CVE-2012-3954 https://bugzilla.redhat.com/show_bug.cgi?id=842428 bz#842428: CVE-2012-3954 dhcp: two memory leaks may result in DoS Upstream acknowledges Glen Eustace of Massey University, New Zealand, as the original reporter of this issue.