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Category:   Application (Generic)  >   Dhcp Vendors:   ISC (Internet Software Consortium)
(Red Hat Issues Fix) ISC DHCP Client Identifier Infinite Loop Lets Remote Users Deny Service
SecurityTracker Alert ID:  1027339
SecurityTracker URL:  http://securitytracker.com/id/1027339
CVE Reference:   CVE-2012-3571   (Links to External Site)
Date:  Aug 3 2012
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.2 to 4.2.4; 4.1-ESV through 4.1-ESV-R5; 4.1.2, 4.1.2-P1
Description:   A vulnerability was reported in ISC DHCP. A remote user on the local network can cause denial of service conditions.

A remote user on the local network can send a specially crafted client identifier parameter value to cause the service to enter an infinite loop, preventing the processing of subsequent client requests and consuming excessive CPU resources on the target system.

Markus Hietava of Codenomicon CROSS project reported this vulnerability via CERT-FI.
Impact:   A remote user on the local network can cause the target service to consume excessive CPU resources on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-1141.html
Vendor URL:  kb.isc.org/article/AA-00712 (Links to External Site)
Cause:   State error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Jul 25 2012 ISC DHCP Client Identifier Infinite Loop Lets Remote Users Deny Service


 Source Message Contents
Date:  Fri, 3 Aug 2012 01:18:02 +0000
Subject:  [RHSA-2012:1141-01] Moderate: dhcp security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: dhcp security update
Advisory ID:       RHSA-2012:1141-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1141.html
Issue date:        2012-08-03
CVE Names:         CVE-2012-3571 CVE-2012-3954 
=====================================================================

1. Summary:

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.

2. 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

3. Description:

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.

4. 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

5. Bugs fixed (http://bugzilla.redhat.com/):

842420 - CVE-2012-3571 dhcp: DoS due to error in handling malformed client identifiers
842428 - CVE-2012-3954 dhcp: two memory leaks may result in DoS

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/dhcp-4.1.1-31.P1.el6_3.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/dhcp-4.1.1-31.P1.el6_3.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/dhcp-4.1.1-31.P1.el6_3.1.src.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 HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/dhcp-4.1.1-31.P1.el6_3.1.src.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 Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/dhcp-4.1.1-31.P1.el6_3.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/dhcp-4.1.1-31.P1.el6_3.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/dhcp-4.1.1-31.P1.el6_3.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/dhcp-4.1.1-31.P1.el6_3.1.src.rpm

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

7. 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
http://www.isc.org/software/dhcp/advisories/cve-2012-3571
http://www.isc.org/software/dhcp/advisories/cve-2012-3954

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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