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RedHat: RHSA-2019-2060 Moderate: DHCP DoS Security Update

red hat
Calendar Grey August 6, 2019
Dist Redhat Esm H88
Red Hat releases a moderate alert regarding the dhcp update that focuses on resolving security vulnerabilities and resolving bugs. Continue reading for more information.
An update for dhcp is now available for Red Hat Enterprise Linux 7

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

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. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network.
Security Fix(es):
* dhcp: double-deletion of the released addresses in the dhcpv6 code leading to crash and possible DoS (CVE-2019-6470)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.7 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat software update DoS DHCP Bug Fix

References

https://access.redhat.com/security/cve/CVE-2019-6470 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.7_release_notes/index

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: dhcp-4.2.5-77.el7.src.rpm
x86_64: dhclient-4.2.5-77.el7.x86_64.rpm dhcp-common-4.2.5-77.el7.x86_64.rpm dhcp-debuginfo-4.2.5-77.el7.i686.rpm dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm dhcp-libs-4.2.5-77.el7.i686.rpm dhcp-libs-4.2.5-77.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: dhcp-4.2.5-77.el7.x86_64.rpm dhcp-debuginfo-4.2.5-77.el7.i686.rpm dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm dhcp-devel-4.2.5-77.el7.i686.rpm dhcp-devel-4.2.5-77.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: dhcp-4.2.5-77.el7.src.rpm
x86_64: dhclient-4.2.5-77.el7.x86_64.rpm dhcp-common-4.2.5-77.el7.x86_64.rpm dhcp-debuginfo-4.2.5-77.el7.i686.rpm dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm dhcp-libs-4.2.5-77.el7.i686.rpm dhcp-libs-4.2.5-77.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: dhcp-4.2.5-77.el7.x86_64.rpm dhcp-debuginfo-4.2.5-77.el7.i686.rpm dhcp-debuginfo-4.2.5-77.el7.x86_64.rpm dhcp-devel-4.2.5-77.el7.i686.rpm dhcp-devel-4.2.5-77.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: dhcp-4.2.5-77.el7.src.rpm
ppc64: dhclient-4.2.5-77.el7.ppc64.rpm dhcp-4.2.5-77.el7.ppc64.rpm dhcp-common-4.2.5-77.el7.ppc64.rpm dhcp-debuginfo-4.2.5-77.el7.ppc.rpm

Read the Full Advisory


Advisory ID: RHSA-2019:2060-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2060
Issue date: 2019-08-06

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat software update DoS DHCP Bug Fix

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Bugs Fixed

1574292 - "dhclient -I" shows "cant find device client" after upgrade

1613174 - ISC dhcpd cannot start TLS session to 389-DS after updating openldap rpm

1623792 - /var/lib/dhcpd/dhcpd.leases: file is too long to buffer. is displayed when dhcpd tries to start.

1672308 - Avoid unnecessary DHCPD restarts by NetworkManager on certain UP events w.r.t. bug #565921

1677382 - dhcp does not compile with rebased bind 9.11

1708641 - CVE-2019-6470 dhcp: double-deletion of the released addresses in the dhcpv6 code leading to crash and possible DoS

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