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Scientific Linux Security Update : dhcp on SL6.x i386/x86_64 (20130221)
high Nessus Plugin ID 64949
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
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.
Solution
Update the affected packages.See Also
Plugin Details
Severity: High
ID: 64949
File Name: sl_20130221_dhcp_on_SL6_x.nasl
Version: 1.8
Type: local
Agent: unix
Published: 3/1/2013
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
CVSS v2
Risk Factor: High
Base Score: 7.1
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C
Vulnerability Information
CPE: p-cpe:/a:fermilab:scientific_linux:dhclient, x-cpe:/o:fermilab:scientific_linux, p-cpe:/a:fermilab:scientific_linux:dhcp-debuginfo, p-cpe:/a:fermilab:scientific_linux:dhcp-devel, p-cpe:/a:fermilab:scientific_linux:dhcp, p-cpe:/a:fermilab:scientific_linux:dhcp-common
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Patch Publication Date: 2/21/2013
Vulnerability Publication Date: 9/14/2012
Reference Information
CVE: CVE-2012-3955