Red Hat: 2012:1141-01: dhcp: Moderate Advisory
Summary
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.
Summary
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
References
https://www.redhat.com/security/data/cve/CVE-2012-3571.html https://www.redhat.com/security/data/cve/CVE-2012-3954.html https://access.redhat.com/security/updates/classification/#moderate
Package List
Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386:
dhclient-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
x86_64:
dhclient-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
i386:
dhcp-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
x86_64:
dhcp-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64:
dhclient-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
Source:
x86_64:
dhcp-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
i386:
dhclient-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
ppc64:
dhclient-4.1.1-31.P1.el6_3.1.ppc64.rpm
dhcp-4.1.1-31.P1.el6_3.1.ppc64.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.ppc64.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.ppc64.rpm
s390x:
dhclient-4.1.1-31.P1.el6_3.1.s390x.rpm
dhcp-4.1.1-31.P1.el6_3.1.s390x.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.s390x.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.s390x.rpm
x86_64:
dhclient-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
Source:
i386:
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
ppc64:
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.ppc.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.ppc64.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.ppc.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.ppc64.rpm
s390x:
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.s390.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.s390x.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.s390.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.s390x.rpm
x86_64:
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
i386:
dhclient-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
x86_64:
dhclient-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-common-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 6):
Source:
i386:
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
x86_64:
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-debuginfo-4.1.1-31.P1.el6_3.1.x86_64.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.i686.rpm
dhcp-devel-4.1.1-31.P1.el6_3.1.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
Topic
Updated dhcp packages that fix three security issues are now available forRed Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.
Topic
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
Bugs Fixed
842420 - CVE-2012-3571 dhcp: DoS due to error in handling malformed client identifiers842428 - CVE-2012-3954 dhcp: two memory leaks may result in DoS