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Scientific Linux SL6.x Low Severity: DHCP Bug Fix and Security Update

Low: dhcp security and bug fix update. Date: Thu, 28 Feb 2013 16:16:39 -0600 Reply-To: Pat Riehecky Sender: Security Errata for Scientific Linux From: Pat Riehecky Organization: Fermilab Subject: Security ERRATA Low: dhcp on SL6.x i386/x86_64 MIME-Version: 1.0 Synopsis: Low: dhcp security and bug fix update Issue Date: 2013-02-21 CVE Numbers: CVE-2012-3955 -- A flaw was found in the way the dhcpd daemon handled the expiration time of IPv6 leases. If dhcpd's configuration was changed to reduce the default IPv6 lease time, lease renewal requests for previously assigned leases could cause dhcpd to crash. (CVE-2012-3955) This update also fixes the following bugs: * Prior to this update, the DHCP server discovered only the first IP address of a network interface if the network interface had more than one configured IP address. As a consequence, the DHCP server failed to restart if the server was configured to serve only a subnet of the following IP addresses. This update modifies network interface addresses discovery code to find all addresses of a network interface. The DHCP server can also serve subnets of other addresses. * Prior to this update, the dhclient rewrote the /etc/resolv.conf file with backup data after it was stopped even when the PEERDNS flag was set to "no" before shut down if the configuration file was changed while the dhclient ran with PEERDNS=yes. This update removes the backing up and restoring functions for this configuration file from the dhclient-script. Now, the dhclient no longer rewrites the /etc/resolv.conf file when stopped. After installing this update, all DHCP servers will be restarted automatically. -- SL6 x86_64 dhclient-4.1.1-34.P1.el6.x86_64.rpm dhcp-common-4.1.1-34.P1.el6.x86_64.rpm dhcp-debuginfo-4.1.1-34.P1.el6.x86_64.rpm dhcp-4.1.1-34.P1.el6.x86_64.rpm dhcp-debuginfo-4.1.1-34.P1.el6.i686.rpm dhcp-devel-4.1.1-34.P1.el6.i686.rpm dhcp-devel-4.1.1-34.P1.el6.x86_64.rpm i386 dhclient-4.1.1-34.P1.el6.i686.rpm dhcp-common-4.1.1-34.P1.el6.i686.rpm dhcp-debuginfo-4.1.1-34.P1.el6.i686.rpm dhcp-4.1.1-34.P1.el6.i686.rpm dhcp-devel-4.1.1-34.P1.el6.i686.rpm - Scientific Linux Development Team . A minor security notice regarding dhcp on Scientific Linux SL6.x focusing on stability problems and setup errors.. dhcp bug fix, Scientific Linux, security advisory, network management. . Severity: Low. LinuxSecurity.com Team

Feb 28, 2013 •Low Scientific Linux