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Alerts This Week
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Moderate DHCP Update for DoS Vulnerabilities in Red Hat Enterprise Linux 6

red hat
Calendar Grey August 3, 2012
Scroller Redhat
Recent modifications to the DHCP packages resolve a trio of security concerns affecting Red Hat Enterprise Linux 6, categorized with moderate significance. Please proceed with the upgrade.
Updated dhcp packages that fix three security issues are now available for Red Hat Enterprise Linux 6

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/articles/11258

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.

Topics%20covered

Topics Covered

security advisory moderate DoS Red Hat Enterprise Linux memory leak DHCP update

References

https://access.redhat.com/security/cve/CVE-2012-3571 https://access.redhat.com/security/cve/CVE-2012-3954 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

Read the Full Advisory


Advisory ID: RHSA-2012:1141-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2012:1141.html
Issue date: 2012-08-03

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.

Topics%20covered

Topics Covered

security advisory moderate DoS Red Hat Enterprise Linux memory leak DHCP update

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

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