RedHat: RHSA-2012-1140:01 Moderate: dhcp security update
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)
Upstream acknowledges Markus Hietava of the Codenomicon CROSS project as
the original reporter of this issue.
Users of DHCP should upgrade to these updated packages, which contain a
backported patch to correct this issue. 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://access.redhat.com/security/updates/classification/#moderate
Package List
Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386:
dhclient-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
x86_64:
dhclient-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.x86_64.rpm
RHEL Desktop Workstation (v. 5 client):
Source:
i386:
dhcp-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
x86_64:
dhcp-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386:
dhclient-3.0.5-31.el5_8.1.i386.rpm
dhcp-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
ia64:
dhclient-3.0.5-31.el5_8.1.ia64.rpm
dhcp-3.0.5-31.el5_8.1.ia64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ia64.rpm
dhcp-devel-3.0.5-31.el5_8.1.ia64.rpm
libdhcp4client-3.0.5-31.el5_8.1.ia64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ia64.rpm
ppc:
dhclient-3.0.5-31.el5_8.1.ppc.rpm
dhcp-3.0.5-31.el5_8.1.ppc.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ppc.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ppc64.rpm
dhcp-devel-3.0.5-31.el5_8.1.ppc.rpm
dhcp-devel-3.0.5-31.el5_8.1.ppc64.rpm
libdhcp4client-3.0.5-31.el5_8.1.ppc.rpm
libdhcp4client-3.0.5-31.el5_8.1.ppc64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ppc.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ppc64.rpm
s390x:
dhclient-3.0.5-31.el5_8.1.s390x.rpm
dhcp-3.0.5-31.el5_8.1.s390x.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.s390.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.s390x.rpm
dhcp-devel-3.0.5-31.el5_8.1.s390.rpm
dhcp-devel-3.0.5-31.el5_8.1.s390x.rpm
libdhcp4client-3.0.5-31.el5_8.1.s390.rpm
libdhcp4client-3.0.5-31.el5_8.1.s390x.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.s390.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.s390x.rpm
x86_64:
dhclient-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.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 one security issue are now available forRed Hat Enterprise Linux 5.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.
Topic
Relevant Releases Architectures
RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Bugs Fixed
842420 - CVE-2012-3571 dhcp: DoS due to error in handling malformed client identifiers