- Issued:
- 2011-12-14
- Updated:
- 2011-12-14
RHSA-2011:1819 - Moderate: dhcp security update
Synopsis
Moderate: dhcp security update
Type/Severity
Security Advisory Moderate
Topic
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.
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.
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 This content is not included.https://access.redhat.com/kb/docs/DOC-11259
Affected Products
| Product | Version | Arch |
|---|---|---|
| Red Hat Storage | 2.0 | x86_64 |
| Red Hat Storage for Public Cloud (via RHUI) | 2.0 | x86_64 |
| Red Hat Gluster Storage Server for On-premise | 2.0 | x86_64 |
| Red Hat Enterprise Linux for x86_64 - Extended Update Support | 6.2 | x86_64 |
| Red Hat Enterprise Linux for x86_64 - Extended Update Support | 6.2 | i386 |
| Red Hat Enterprise Linux for Scientific Computing | 6 | x86_64 |
| Red Hat Enterprise Linux for Power, big endian | 6 | ppc64 |
| Red Hat Enterprise Linux for Power, big endian - Extended Update Support | 6.2 | ppc64 |
| Red Hat Enterprise Linux for IBM z Systems | 6 | s390x |
| Red Hat Enterprise Linux for IBM z Systems - Extended Update Support | 6.2 | s390x |
| Red Hat Enterprise Linux Workstation | 6 | x86_64 |
| Red Hat Enterprise Linux Workstation | 6 | i386 |
| Red Hat Enterprise Linux Server | 6 | x86_64 |
| Red Hat Enterprise Linux Server | 6 | i386 |
| Red Hat Enterprise Linux Server from RHUI | 6 | x86_64 |
| Red Hat Enterprise Linux Server from RHUI | 6 | i386 |
| Red Hat Enterprise Linux Server - Retired Extended Life Cycle Support | 6 | x86_64 |
| Red Hat Enterprise Linux Server - Extended Update Support from RHUI | 6.2 | x86_64 |
| Red Hat Enterprise Linux Server - Extended Update Support from RHUI | 6.2 | i386 |
| Red Hat Enterprise Linux Server - Extended Life Cycle Support | 6 | x86_64 |
| Red Hat Enterprise Linux Server - Extended Life Cycle Support | 6 | i386 |
| Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension | 6 | x86_64 |
| Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension | 6 | i386 |
| Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) | 6 | s390x |
| Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) | 6 | s390x |
| Red Hat Enterprise Linux Server - AUS | 6.2 | x86_64 |
| Red Hat Enterprise Linux Desktop | 6 | x86_64 |
| Red Hat Enterprise Linux Desktop | 6 | i386 |
Updated Packages
- dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm
- dhcp-4.1.1-25.P1.el6_2.1.i686.rpm
- dhcp-devel-4.1.1-25.P1.el6_2.1.ppc.rpm
- dhcp-4.1.1-25.P1.el6_2.1.ppc64.rpm
- dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390.rpm
- dhcp-devel-4.1.1-25.P1.el6_2.1.ppc64.rpm
- dhcp-devel-4.1.1-25.P1.el6_2.1.s390x.rpm
- dhcp-common-4.1.1-25.P1.el6_2.1.s390x.rpm
- dhcp-devel-4.1.1-25.P1.el6_2.1.s390.rpm
- dhclient-4.1.1-25.P1.el6_2.1.ppc64.rpm
- 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.ppc.rpm
- dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
- dhcp-devel-4.1.1-25.P1.el6_2.1.x86_64.rpm
- dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
- dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
- dhclient-4.1.1-25.P1.el6_2.1.i686.rpm
- dhcp-common-4.1.1-25.P1.el6_2.1.ppc64.rpm
- dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390x.rpm
- dhcp-4.1.1-25.P1.el6_2.1.s390x.rpm
- dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc64.rpm
- dhcp-4.1.1-25.P1.el6_2.1.src.rpm
- dhclient-4.1.1-25.P1.el6_2.1.s390x.rpm
- dhcp-common-4.1.1-25.P1.el6_2.1.i686.rpm
Fixes
CVEs
References
- https://access.redhat.com/security/updates/classification/#moderate
- Content from www.isc.org is not included.Content from www.isc.org is not included.http://www.isc.org/software/dhcp/advisories/cve-2011-4539
Additional information
- The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
- Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.