RHEL 6 : dhcp (RHSA-2013:0504)

high Nessus Plugin ID 64755

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Synopsis

The remote Red Hat host is missing a security update for dhcp.

Description

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2013:0504 advisory.

The dhcp packages provide the Dynamic Host Configuration Protocol (DHCP) 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 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. (BZ#803540)

* 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. (BZ#824622)

All users of DHCP are advised to upgrade to these updated packages, which fix these issues. After installing this update, all DHCP servers will be restarted automatically.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL dhcp package based on the guidance in RHSA-2013:0504.

Plugin Details

Severity: High

ID: 64755

File Name: redhat-RHSA-2013-0504.nasl

Version: 1.27

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 2/21/2013

Updated: 4/15/2025

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

Vendor

Vendor Severity: Low

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2012-3955

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:dhcp-common, p-cpe:/a:redhat:enterprise_linux:dhcp-devel, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:dhcp, p-cpe:/a:redhat:enterprise_linux:dhclient

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 2/21/2013

Vulnerability Publication Date: 9/14/2012

Reference Information

CVE: CVE-2012-3955

BID: 55530

RHSA: 2013:0504

Detections

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