Updated dhcp packages that fix two security issues are now available for Red Hat Enterprise Linux 4, 5, and 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 associated with each description below.
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.
- CVE-2011-2748, CVE-2011-2749
Two denial of service flaws were found in the way the dhcpd daemon handled certain incomplete request packets. A remote attacker could use these flaws to crash dhcpd via a specially-crafted request.
Users of DHCP should upgrade to these updated packages, which contain a backported patch to correct these issues. After installing this update, all DHCP servers will be restarted automatically.
Updated dhcp packages that fix one bug are now available for Red Hat Enterprise Linux 5.
The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an Internet Protocol (IP) network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address.
Previously, the anaconda dhcptimeout value was not fully propagated to libdhcp4client's internal timeout_arg. As a result, it used the insufficient default timeout of 60 seconds. With this update, anaconda dhcptimeout value is correctly propagated and the problem no longer occurs with this update. This update is a dependency of BZ#737155
All DHCP Users are advised to upgrade to these updated packages, which fix this bug.