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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2011.1254 Moderate: dhcp security update 15 December 2011 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: dhcp Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 6 Red Hat Enterprise Linux WS/Desktop 6 Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2011-4539 Reference: ESB-2011.1227 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2011-1819.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: dhcp security update Advisory ID: RHSA-2011:1819-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-1819.html Issue date: 2011-12-14 CVE Names: CVE-2011-4539 ===================================================================== 1. Summary: Updated dhcp packages that fix one security issue are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link 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 DHCP request packets when regular expression matching was used in "/etc/dhcp/dhcpd.conf". A remote attacker could use this flaw to crash dhcpd. (CVE-2011-4539) 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. 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/kb/docs/DOC-11259 5. Bugs fixed (http://bugzilla.redhat.com/): 761265 - CVE-2011-4539 dhcp: DoS due to processing certain regular expressions 6. Package List: Red Hat Enterprise Linux Desktop (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm i386: dhclient-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-common-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm x86_64: dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.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-4.1.1-25.P1.el6_2.1.src.rpm i386: dhcp-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm x86_64: dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.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-4.1.1-25.P1.el6_2.1.src.rpm x86_64: dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.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-4.1.1-25.P1.el6_2.1.src.rpm x86_64: dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.x86_64.rpm Red Hat Enterprise Linux Server (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm i386: dhclient-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-common-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm ppc64: dhclient-4.1.1-25.P1.el6_2.1.ppc64.rpm dhcp-4.1.1-25.P1.el6_2.1.ppc64.rpm dhcp-common-4.1.1-25.P1.el6_2.1.ppc64.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc64.rpm s390x: dhclient-4.1.1-25.P1.el6_2.1.s390x.rpm dhcp-4.1.1-25.P1.el6_2.1.s390x.rpm dhcp-common-4.1.1-25.P1.el6_2.1.s390x.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390x.rpm x86_64: dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.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-4.1.1-25.P1.el6_2.1.src.rpm i386: dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm ppc64: dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc64.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.ppc.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.ppc64.rpm s390x: dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390x.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.s390.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.s390x.rpm x86_64: dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm i386: dhclient-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-common-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm x86_64: dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.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-4.1.1-25.P1.el6_2.1.src.rpm i386: dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm x86_64: dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm dhcp-devel-4.1.1-25.P1.el6_2.1.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-2011-4539.html https://access.redhat.com/security/updates/classification/#moderate http://www.isc.org/software/dhcp/advisories/cve-2011-4539 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2011 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFO6PNMXlSAg2UNWIIRApbeAKC+qGwPXMyblUNv35s064NjHCmrkQCfRrS/ es3vgT1+FYmB9UVr4cgDpXs= =8mVI - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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